15 December 1972 t I E N UVol. 178, No. 4066

LETTERS Adequate Protection: M. Goldberg; Modern Taxonomy: E. 0. Wilson; H. E.Evans; S. van der Spoel, A. C. Pierrot-Bults, R. W. M. van Soest; P. H. Raven . 1151

EDITORIAL Come, Now, and Let Us Reason Together: M. Rees ........................ 1155

ARTICLES Gravitation Theory: Empirical Status from Solar System Experiments:K. L. Nordtvedt, Jr ........................................... 1157

Genetic Control of Insect Populations: R. H. Smith and R. C. von Borstel ........ 1164

Evaluation of Infant Intelligence: M. Lewis and H. McGurk .... .............. 1174

NEWS AND COMMENT

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BOARD OF DIRECTORS

VICE PRESIDENTS ANDSECTION SECRETARIES1

DIVISIONS

Grant Termination: Scientist Wins $16 Million for Loss of Support ............H. Allen Smith Jet Propulsion Lab-or What's in a Name?.................Los Alamos Scientific Laboratory: Weapons Are Still the Focus ..............

U.N. Environmental Program: Despite Hitch, Coming on Strong ..............

Energy Needs: Projected Demands and How to Reduce Them ................

Cyclic AMP in Brain: Role in Synaptic Transmission ......................

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Exploring New Ethics for Survival: reviewed by G. M. Woodwell; TheAssessment of Population Affinities in Man: R. Singer; SecondaryAnalysis of Sample Surveys: M. Rosenberg; Reactions of Molecules atElectrodes: H. Gerischer; Books Received. ........................... 1191

MMINA REES 'GLENN 'T. SEABORG LEONARD M. RIESER DAVID BLACKWEL LEWIS M. BRANSCOMBRetiring President, Chairman Presdent President-Elie RICHARD H. BARRY COMMONER

MATHEMATICS (A) PHYSICS (B) CHEMISTRY C) ASTRONOMY (0)MATi{:EM"l:CS:(F ::: xPHYSfCS:::(B) wt1; p g s George B. Field;John W. Tufjkey Herbert Friedman Martin Paul Geog B FiedF. A. Fickeni: t:: RoIff M. 0;Sincaia:|tr 0: Leo Schubert Arlo U. Landolt

0- HiSl:~ORY ANiD PH0ILOSOPHY OF StIENCE (L)PSYCHOLOGY (1) SOCIAL AND ECONOMICXSCIENCES (K) HIST AND P OF SJames S.Coleman ~~~~~~~EverefttMendelsohnDale B. Harris Raymond J. Seegern

Wi;liam :D. Garvey Harvey Sapolsky :-: Y *e:e'PHARMACEUTICA SCIENCES (CUTURE -( NDUSTRIAL (P)D ON (Q)Linwo Tire Roy L. Lo Jacob E. Godman Lloy .L Johnson;

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Temperature Regulation by the Inflorescence of Philodendron: K. A. Nagy,D. K. Odell, R. S. Seymnour.....................................

Smoke of Cigarettes and Little Cigars: An Analytical Comparison:D. HoflJmanin and E. L. Wynder..................................

Gravitational Effects on Concentrations and Partial Pressures in Solutions:A Thermodynamic Analysis: F. C. Andrews .........................

Ragweed Hay Fever: Genetic Control and Linkage to HL-A Haplotypes:B. B. Levine, R. H. Stember, M. Fotino ............................

Collagen Synthesis in Xenopus elocytes after Injection of Nuclear RNA of FrogEmbryos: J. W. Rollins and R. A. Flickinger ........................

Circadian Corticosteroid Periodicity: Critical Period for Abolition byNeonatal Injection of Corticosteroid: D. T. Krieger ....................

Nitrogen Fixation by a Blue-Green Epiphyte on Pelagic Sargassuml:E. J. Carpenter .............................................

Dispersal of Rabbit Lung into Individual Viable Cells: A New Model for theStudy of Lung Metabolism: K. G. Gould, Jr., et al.....................

Reversed Development and Cellular Aging in an Insect: S. D. Beck andR. K. Bharadwaj ............................................

Inhibition of Sperm-Egg Interaction by Specific Antibody: C. A. Shivers et al.......

Ultraviolet Reflection of a Male Butterfly: Interference Color Caused byThin-Layer Elaboration of Wing Scales: H. Ghiradella et al...............

Moving Visual Scenes Influence the Apparent Direction of Gravity:J. Dichgans et al.............................................

Synthetic Rat Scotophobin Induces Dark Avoidance in Mice: D. H. Malin andH. N. Guwttnan .............................................

Observational Learning and Social Facilitation in the Rat: T. R. Zentalland J. M. Levine ............................................

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COVER

Portion of an ultraviolet-reflectingwing scale of the butterfly Euremalisa. The ultraviolet reflection is struc-tural rather than pigmentary, and iscaused by optical interference in thelainellar system associated with theridges that project upward from thescale. See page 1214. [Diagram by R.Loos, State University of New Yorkat Albany]

The American Association for the Advancement of Science was founded in 1848 and incorporated in1874. Its objects are to further the work of scientists, to facilitate cooperation among them, toimprove the effectiveness of science in the promotion of human welfare, and to increase public under-

standing and appreciation of the importance and promise of the methods of science in human progress.

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