department of science and technology · web viewvol. 97 no. 2 june 1968 national science...
TRANSCRIPT
Vol. 97 No. 2 June 1968
National Science Development Board
Juan S. Salcedo, Jr., M.S., M.D.,Chairman
Diminador O. Reyes.,Ll. B.,
Officer-in-Charge, Office of Vice Chairman and Executive Director
Members of the Board
Pedro Afable, B.S.C.E.George T. Marcelo, B.S.B.A.
Constacio M. Ancheta, Ph.D.Augusto L. Tenmatay, Ph.D.
Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., Commisioner
Flaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research Center
Vacant
Biological Research Center
Luz Baens-Arcega, M.S.
Director
Food & Nutrition Research Center
Conrado R. Pascual, M.D., M.P.H.
Director
Industrial Research Center
Felife Ll. Santillan, B.S.M.E.
Director
Medical Research Center
Rogelio N. Relova, M.D.
Director
Tests & Standards Laboratories
Jose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., Editor
Clare Baltazar, Ph.D.; Ireana R.F. Cruz, A.M.; Guillermina Mañalac, M.S., Associate Editor
Mauro Garcia, B.S.E., Managing Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Faustino S. Orillo, Ph.D.
Antonio Pizarro, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
F.Landa Jocano, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Jose Vera Santos, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Alfredo C. Santos, Ph.D.
Augusto L. Tenmatay, Ph.D.
Nutrition
Leon G. Alejo, B.S.
Josefina B. Jayme, M.D.
Sonia Y. De Leon, Ph.D.
Luz U. Oñate, Ph.D.
Geology
Arturo Alcaraz, M.S.
Cecar B. Ibañez, M.S.
Mateo H. Tupaz, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Paulo C. Campos, M.D.
Conrado S. Dayrit, M.D.
Rogelio N. Relova, M.D.
Victor Valenzuela, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Macario Palo, B.S.A.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Ramon Samaniego, Ph.D.
Getulio B. Viado, Ph.D.
Zoology
Nelia P. Salazar, M.S.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.
Vol. 97 No. 1 March, 1968
National Science Development Board
Juan S. Salcedo, Jr., M.S., M.D.,Chairman
Diminador O. Reyes.,Ll. B.,
Officer-in-Charge, Office of Vice Chairman and Executive Director
Members of the Board
Pedro Afable, B.S.C.E.George T. Marcelo, B.S.B.A.
Constacio M. Ancheta, Ph.D.Augusto L. Tenmatay, Ph.D.
Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., Commisioner
Flaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research Center
Vacant
Biological Research Center
Luz Baens-Arcega, M.S.
Director
Food & Nutrition Research Center
Conrado R. Pascual, M.D., M.P.H.
Director
Industrial Research Center
Felife Ll. Santillan, B.S.M.E.
Director
Medical Research Center
Rogelio N. Relova, M.D.
Director
Tests & Standards Laboratories
Jose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., Editor
Clare Baltazar, Ph.D.; Ireana R.F. Cruz, A.M.; Guillermina Mañalac, M.S., Associate Editor
Mauro Garcia, B.S.E., Managing Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Faustino S. Orillo, Ph.D.
Antonio Pizarro, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
F.Landa Jocano, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Jose Vera Santos, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Alfredo C. Santos, Ph.D.
Augusto L. Tenmatay, Ph.D.
Nutrition
Leon G. Alejo, B.S.
Josefina B. Jayme, M.D.
Sonia Y. De Leon, Ph.D.
Luz U. Oñate, Ph.D.
Geology
Arturo Alcaraz, M.S.
Cecar B. Ibañez, M.S.
Mateo H. Tupaz, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Paulo C. Campos, M.D.
Conrado S. Dayrit, M.D.
Rogelio N. Relova, M.D.
Victor Valenzuela, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Macario Palo, B.S.A.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Ramon Samaniego, Ph.D.
Getulio B. Viado, Ph.D.
Zoology
Nelia P. Salazar, M.S.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Vol. 96 No. 4 December, 1967
National Science Development Board
Juan S. Salcedo, Jr., M.S., M.D.,Chairman
Diminador O. Reyes.,Ll. B., Officer-in-Charge, Office
Of Vice Chairman and
Executive Director
Members of the Board
Pedro Afable, B.S.C.E.George T. Marcelo, B.S.B.A.
Constacio M. Ancheta, Ph.D.Augusto L. Tenmatay, Ph.D.
Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., Commisioner
Flaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research Center
Vacant
Biological Research Center
Luz Baens-Arcega, M.S.
Director
Food & Nutrition Research Center
Conrado R. Pascual, M.D., M.P.H.
Director
Industrial Research Center
Felife Ll. Santillan, B.S.M.E.
Director
Medical Research Center
Rogelio N. Relova, M.D.
Director
Tests & Standards Laboratories
Jose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., Editor
Ireana R.F. Cruz, A.M., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Sonia Y. De Leon, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Conrado S. Dayrit, M.D.
Paulo C. Campos, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Zoology
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D.
Vol. 96 No. 3 September, 1967
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Diminador O. Reyes., Officer-in-Charge, Office
Of Vice Chairman and
Executive Director
Members of the Board
Pedro Afable, B.S.C.E.George T. Marcelo, B.S.B.A.
Constacio M. Ancheta, Ph.D.Augusto L. Tenmatay, Ph.D.
Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., Commisioner
Flaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research Center
Vacant
Biological Research Center
Luz Baens-Arcega, M.S.
Director
Food & Nutrition Research Center
Conrado R. Pascual, M.D., M.P.H.
Director
Industrial Research Center
Felife Ll. Santillan, B.S.M.E.
Director
Medical Research Center
Rogelio N. Relova, M.D.
Director
Tests & Standards Laboratories
Jose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., Editor
Ireana R.F. Cruz, A.M., Associate Editor
Mauro Garcia, B.S.E., Managing Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Sonia Y. De Leon, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Conrado S. Dayrit, M.D.
Paulo C. Campos, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Zoology
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D.
Vol. 96 No. 2 June, 1967
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Diminador O. Reyes., Officer-in-Charge, Office
Of Vice Chairman and
Executive Director
Members of the Board
Pedro Afable, B.S.C.E.George T. Marcelo, B.S.B.A.
Constacio M. Ancheta, Ph.D.Augusto L. Tenmatay, Ph.D.
Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., Commisioner
Flaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research Center
Vacant
Biological Research Center
Luz Baens-Arcega, M.S.
Director
Food & Nutrition Research Center
Conrado R. Pascual, M.D., M.P.H.
Director
Industrial Research Center
Felife Ll. Santillan, B.S.M.E.
Director
Medical Research Center
Rogelio N. Relova, M.D.
Director
Tests & Standards Laboratories
Jose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Ph.D., Editor
Ileana R.F. Cruz, A.M., Associate Editor
Mauro Garcia, B.S.E., Managing Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Sonia Y. De Leon, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Conrado S. Dayrit, M.D.
Paulo C. Campos, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Zoology
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 96 No. 1 March, 1967
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Diminador O. Reyes., Officer-in-Charge, Office
Of Vice Chairman and
Executive Director
Members of the Board
Pedro Afable, B.S.C.E.George T. Marcelo, B.S.B.A.
Constacio M. Ancheta, Ph.D.Augusto L. Tenmatay, Ph.D.
Jose R. Velasco, Ph.D.
National Institute of Science and Technology
Jose R. Velasco Ph.D., Commisioner
Flaviano M. Yenko, A.B., B.S., Deputy Commisioner
Agricultural Research Center
Vacant
Biological Research Center
Luz Baens-Arcega, M.S.
Director
Food & Nutrition Research Center
Conrado R. Pascual, M.D., M.P.H.
Director
Industrial Research Center
Felife Ll. Santillan, B.S.M.E.
Director
Medical Research Center
Rogelio N. Relova, M.D.
Director
Tests & Standards Laboratories
Jose P. Planas, B.S., Chem. Eng.
Acting Chief
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Carmen Ll. Intengan, Editor
Ileana R. F. Cruz, A.M., Associate Editor
Mauro Garcia, B.S.E., Managing Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Sonia Y. De Leon, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Conrado S. Dayrit, M.D.
Paulo C. Campos, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Zoology
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D.
Vol. 95 No. 4 December,1966
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 95 No. 3 September,1966
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 95 No. 2 June,1966
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 94 No. 4 December,1965
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 94 No. 3 September,1965
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 94 No. 2 June,1965
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 94 No. 1 March,1965
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 93 No. 4 December,1964
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Eufronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 93 No. 3 September,1964
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
E. Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Eufronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 93 No. 2 June,1964
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Eufronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 93 No. 1 March,1964
National Science Development Board
Juan S. Salcedo, Jr., M.D.,Chairman
Gregorio Y. Zara, D.Sc.,Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Conrado R. Pascual, M.D., M.P.H., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Jose B. Barcelon, B.S.G.E.
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Luz Baens-Arcega, M.S.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.
Vol. 92 No. 4 December,1963
National Science Development Board
Juan S. Salcedo, Jr., M.D., Acting Chairman
Gregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.M.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Carmen Ll. Intengan, Ph.D.
Geology
Jose B. Barcelon, B.S.G.E.
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Macario A. Palo, B.S.A.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D
Vol. 92 No. 3 September,1963
National Science Development Board
Juan S. Salcedo, Jr., M.D., Acting Chairman
Gregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.M.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Conrado R. Pascual, M.D.
Geology
Jose B. Barcelon, B.S.G.E.
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Macario A. Palo, B.S.A.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D
.
Vol. 92 No. 2 June ,1963
National Science Development Board
Juan S. Salcedo, Jr., M.D., Acting Chairman
Gregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Editor
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.M.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Conrado R. Pascual, M.D.
Geology
Jose B. Barcelon, B.S.G.E.
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Macario A. Palo, B.S.A.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D.
Vol. 92 No. 1 March ,1963
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Gregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Jose A. Fernandez, M.D.Jose P. Marcelo, M.S.
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc. Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Edito
Mauro Garcia, B.S.E., Copy Editor
Contributing Editor
Agriculture
Anacleto B. Coronel, D.V.M.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Sofronio Carrasco, M.D., Ph.D.Sonia Y. De Leon, Ph.D.
Conrado R. Pascual, M.D.
Geology
Jose B. Barcelon, B.S.G.E.
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Macario A. Palo, B.S.A.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D.
Vol. 91 No. 4 December ,1962
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Gregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc.Jose J. Mirasol, Ph.D.
Jose P. Marcelo, M.S.Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, A.B.., B.C., Associate Edito
Mauro Garcia, B.S.E., Copy Editor
Contributing Editors
Agriculture
Anacleto B. Coronel, D.V.M.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Carmen Ll. Intengan, Ph.D.Sonia Y. De Leon, Ph.D.
Conrado R. Pascual, M.D.
Geology
Jose B. Barcelon, B.S.G.E.
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Macario A. Palo, B.S.A.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D.
Vol. 91 No. 3 September ,1962
National Science Development Board
Juan S. Salcedo, Jr., M.D., M.S., Acting Chairman
Gregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc.Jose J. Mirasol, Ph.D.
Jose P. Marcelo, M.S.Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, B.A., B.C., Associate Edito
Mauro Garcia, B.S.E., Copy Editor
Contributing Editors
Agriculture
Anacleto B. Coronel, D.V.M.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Carmen Ll. Intengan, Ph.D.Leonarda M. Jurado, Ph.D.
Conrado R. Pascual, M.D.
Geology
Jose B. Barcelon, B.S.G.E.
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Macario A. Palo, B.S.A.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D.
Vol. 91 No. 1-2 March-June ,1962
National Science Development Board
Juan S. Salcedo, Jr., M.D., M.S., Acting Chairman
Gregorio Y. Zara, D.Sc., Acting Vice Chairman
Members of the Board
Isidro Macaspac, M.A.Florencio A. Medina, M.
Canuto G. Manuel, D.Sc.Jose J. Mirasol, Ph.D.
Jose P. Marcelo, M.S.Enrique T. Virata, Ph.D.
Alejandro Roces, M.A.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc., Editor
Flaviano M. Yenko, B.A., B.C., Associate Edito
Mauro Garcia, B.S.E., Copy Editor
Contributing Editors
Agriculture
Anacleto B. Coronel, D.V.M.
Eugenio E. Cruz, M.S.
Ricardo T. Marfori, Ph.D..
Dioscoro L. Umali, Ph.D.
Anthropology
Alfredo E. Evangelista, M.A.
Robert B. Fox, Ph.D.
Marcelino N. Maceda, Ph.D.
Arsenio E. Manuel, M.A.
Botany
Demetrio R. Mendoza, M.S.
Faustino T. Orillo Ph.D.
Jose R. Velasco, Ph.D.
Gregorio Velasquez, Ph.D.
Chemistry
Ignacio S. Salcedo, Ph.D.
Alfredo C. Santos, Ph.D.
Bienvenido C. Sison, Ph.D.
Augusto L. Tenmatay, Ph.D.
Food and Nutrition
Bernardo Acena, Ph.D.
Carmen Ll. Intengan, Ph.D.Leonarda M. Jurado, Ph.D.
Conrado R. Pascual, M.D.
Geology
Jose B. Barcelon, B.S.G.E.
Cesar B. Ibañes, M.S.
Mateo H. Tupas, Ph.D.
Elpidio C. Vera, M.S.
Medicine
Benjamin A. Barrera, M.D.
Conrado S. Dayrit, M.D.
Trinidad P. Pesigan, M.D.
Rogelio N. Relova, M.D.
Microbiology
Potenciano R. Aragon, M.D.
Martin S. Celino, M.S.
Macario A. Palo, B.S.A.
Mario O. San Juan, Ph.D.
Nuclear Science
Pedro G. Afable, B.S.C.E.
Julian Banzon, Ph.D.
Paulo C. Campos, M.D.
Jose O. Juliano, Ph.D.
Zoology
Herminio Rabanal, Ph.D.
Leopoldo B. Uichanco, D.Sc.
Agustin F. Umali, B.S.
Getulio B. Vialdo, Ph.D.
Vol. 90 No. 4 December,1961
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Canuto G. Manuel, D.Sc.Juan S. Salsedo, Jr., M.D., M.A.
Oscar B. Mapua, B.S.C.E.Enrique T. Virata, Ph.D.
Florencio A. Medina, M.S.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Flaviano M. Yenko, B.A., B.C.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 90 No. 3 September,1961
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Juan S. Salsedo, Jr., M.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Enrique T. Virata, Ph.D. Canuto G. Manuel, D.Sc.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Flaviano M. Yenko, B.A., B.C.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 90 No. 2 June,1961
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Juan S. Salsedo, Jr., M.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Enrique T. Virata, Ph.D. Canuto G. Manuel, D.Sc.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Flaviano M. Yenko, B.A., B.C.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 90 No. 1 March,1961
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Juan S. Salsedo, Jr., M.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Enrique T. Virata, Ph.D. Canuto G. Manuel, D.Sc.Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Canuto G. Manuel D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Flaviano M. Yenko, B.A., B.C.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 89 No. 3 September-December,1960
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Crisostomo Ortigas, M.S.M.E
Joaquin Marañon, D.Sc.Antonio G. Sison, M.D.
Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Canuto G. Manuel, D.Sc.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 89 No. 2June,1960
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Crisostomo Ortigas, M.S.M.E
Joaquin Marañon, D.Sc.Antonio G. Sison, M.D.
Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Canuto G. Manuel, D.Sc.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 89 No. 1March,1960
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Crisostomo Ortigas, M.S.M.E
Joaquin Marañon, D.Sc.Antonio G. Sison, M.D.
Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Canuto G. Manuel, D.Sc.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 88 No. 4December,1959
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Crisostomo Ortigas, M.S.M.E
Joaquin Marañon, D.Sc.Antonio G. Sison, M.D.
Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Canuto G. Manuel, D.Sc.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 88 No. 3September,1959
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Crisostomo Ortigas, M.S.M.E
Joaquin Marañon, D.Sc.Antonio G. Sison, M.D.
Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Canuto G. Manuel, D.Sc.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 88 No. 2June,1959
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Crisostomo Ortigas, M.S.M.E
Joaquin Marañon, D.Sc.Antonio G. Sison, M.D.
Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Canuto G. Manuel, D.Sc.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Feliza, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.
Vol. 88 No. 1March, 1959
National Science Development Board
Paulino J. Garcia, M.D., Chairman
Casimiro del Rosario, Ph.D.
Vice Chairman and Executive Director
Members of the Board
Teodoro Evangelista, LL.B., LL.D.Florencio A. Medina, M.S.
Isidro Macaspac, M.A.Jose J. Mirasol, Ph.D.
Oscar B. Mapua, B.S.C.E.Crisostomo Ortigas, M.S.M.E
Joaquin Marañon, D.Sc.Antonio G. Sison, M.D.
Gregorio Y. Zara, D.Sc.
The Philippine Journal of Science
Published quarterly by the National Institute of Science and Technology
(Formely Bureau of Science), P.O. Box 774, Manila, Philippines
Joaquin Marañon, D.Sc.
Editor
Eduardo Quisumbing, Ph.D.Canuto G. Manuel, D.Sc.
Associate Editor Associate Editor
Mauro Garcia, B.S.E.
Copy Editor
Contributing Editors
AgricultureNuclear ScienceMedicine
Anacleto B. Coronel, D.V.M.Pedro G. Afable, B.S.C.EWalfrido de Leon, M.D., D.T.M
Eugenio E. Cruz, M.S.Julian Banzon, Ph.D.Virgilio Ramos, M.D.
Nemesio B. Mendiola, Ph.D.Paulo C. Campos, M.D.Rogelio Relova, M.D.
Leopoldo B. Uichanco, D.Sc.Ignacio S. Salcedo, Ph.D.Agerico B.M. Sison, M.D.
AnthropologyFood and NutritionZoology
H. Otley Beyer, M.A.Bernardo Acena, Ph.D.Leopoldo S. Clemente, Ph.D.
Robert B. Fox, Ph.D.Conrado R. Pascual, M.D.Heraclio R. Montalban, M.A.
E. Arsenio Manuel M.A.Juan S. Salcedo, Jr., M.D.Deogracias V. Villadodid, Ph.D.
Marcelino N. Maceda, Ph.D.Florencio A. Soliven, M.S.Lope M. Yutuc, D.V.M.
BotanyGeology
Jose M. Capinpin, Ph.D.Antonio D. Alvir, Ph.D.
Tanquilino G. Fajardo, Ph.D.Cesar B. Ibañez, M.S.
Macario A. Palo, B.S.A.Elpidio Vera, M.S.
Gregorio Velasquez, Ph.D.Mateo T. Tupas, Ph.D.
ChemistryIndustrial Technology
Dionisio Birosel, Ph.D.Manuel I. Felizardo, B.S.M.E.
Aurelio O. Cruz, Phar. Chem.Gil O. Opiana, B.S.A., Chem. Eng.
Marcos M. Alicante, Ph.D.Mariano P. Ramiro, Ph.D.
Patrocinio Valenzuela, Ph.D.Anastacio L. Teodoro, Ph.D.