UuT~SOLIENCEState col-NEW SERIES FRIDA SET 8 1939 SUBSCRIPTION, $6.00Vol,. 90, iNo. 2332 RI Y, EPTEMBER 8 SINGLE COPIES, .15

CHORDATE ANATOMY-Neal and Rand

This text in comparative anatomy presents the subject for a one-semester course giving the fundamentals ina clear, concise and readable manner.

378 Illus. 467 Pages. Washable Fabric $3.50By Herbert V. Neal, Ph.D., Sc.D., Tufts College, and Herbert W. Rand, Ph.D., Harvard University

COMPARATIVE ANATOMY-Neal and RandThis successful textbook was written for an expansive course in comparative anatomy. Descriptions arcclear and the style is readable. Numerous well labeled figures supplement and illustrate the text.

540 Illus. 739 Pages. Washable Fabric $4.75By Herbert V. Neal, Ph.D., Sc.D., Tufts College, and Herbert W. Rand, Ph.D., Harvard University

LABORATORY DIRECTIONS FOR COMPARATIVE VERTEBRATE ANATOMY-GrayThis student's manual can be used with any standard textbook with a minimum of aid from the instructor.The principal animals considered are the shark, Necturus and the cat. Each organ system is treated in a

comparative manner.80 Pages. Washable Fabric "Wire-O-Binding" $1.00By I. E. Gray, Ph.D., Assoc. Prof. of Zoology, Duke University

INTRODUCTION AND GUIDE TO THE STUDY OF HISTOLOGY-LambertThis text provides a course for students whose primary objective is not to become histologists but to acquirea knowledge of the subject as a foundation for further studies in physiology and pathology. The bookpresents comprehensive directions for laboratory work.185 Illus. 542 Pages. Washable Fabric $5.00By Avery E. Lambert, Ph.D., School of Medicine, State University of Iowa

TEXTBOOK OF HISTOLOGY, 5th Ed.-BremerThis textbook of histology is arranged upon an embryological basis. Emphasis is given to normal functionalchanges in the various cells and to their activities in the living state. The illustrations are noteworthy.455 Illus. 36 In Colors. 580 Pages. Washable Fabric $6.50By J. Lewis Bremer, M.D., School of Medicine, Harvard University

THE BIOLOGY OF THE CELL SURFACE-JustThis book presents from a purely biological point of view a thesis which sets a new goal for biology. Prob-lems of animal development are exposed, defined and related to the activity of the cell surface.42 Illus. (116 Figs.) some in Colors. Bibliography. 392 Pages. Washable Fabric $5.50By Ernest Everett Just

BASIC METHODS FOR EXPERIMENTS ON EGGS OF MARINE ANIMALS-JustThis book gives general rules for the experimental investigation of eggs and spermatozoa of marine inverte-brates. It will serve as a guide for the specialist whose work demands individual extension of methods anda basis for beginners in experimental embryology. A large section is devoted to methods for the preparationof the fixed egg.Washable Fabric. 89 Pages. "Wire-O-Binding" $1.25By Ernest Everett Just

THE PLANT ALKALOIDS, 3rd Ed.-HenryThis book describes the properties, chemistry of products, occurrence, methods of estimation, physiologicalaction, etc., of the plant alkaloids. A considerable amount of new material is prcsented.689 Pages. Washable Fabric $12.00By Thomas A. Henry, D.Sc., Wellcome Chemical Research Laboratories, Eng.

1012 Walnut Street THE BLAKISTON COMPANY Philadelphia

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THE PHYSIOLOGYAND PHARMACOLOGY

OF THE PITUITARY BODYBy H. B. VAN DYKE, M.D.

VOLUME II. Deals with the functional aspectsof the pituitary, covering the experimental work inthe field from late 1935, where the previous volumeleft off to 1938. Considers in detail recent ad-vances in the biology of the hypophysis.Volume II. 422 pages, 46 illustrations, $4.50Volume I. 578 pages, 55 illustrations, $4.50

INTRACRANIAL TUMORSOF INFANCY AND EARLY CHILDHOOD

By PERCIVAL BAILEY, M.D., DOUGLAS N. BUCHANAN,M.D., AND PAUL C. BuCy, M.D.

Based on 100 consecutive cases in Children's Me-morial Hospital and Bobs Roberts Memorial Hospi-tal of Chicago and Milwaukee Children's Hospital,this study aids physicians in predicting successfulremoval of intracranial tumors before operating.

652 pages, 117 illustrations, $5.00

The University of Chicago Press

August Choice of the Scientific Book ClubSCIENCE and SOCIAL CHANGE

Compiled by Jesse E. ThorntonA selected group of forty-nine readings drawn from the works of eminentwriters and arranged to reveal the interrelations of natural science, inventions,engineering, economics and government, and show some of the significantconcepts in respect to each field.

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SCIENCE-ADVERTISEMENTS VOL. 90, NO. 23322

SEPTEMBER 8, 1939 SCIENCE-ADVERTISEMENTS 3

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men were avoided, and the difference in the two typesof pH determinations was maintained within 0.5 unit.

The accompanying Fig. 1 shows the accuracy of themethod. The fasting contents of an anesthetized dogwere diluted to 100 cc with distilled water and a con-trol recording made. The introduction of 1 gram ofsodium bicarbonate in 100 cc of distilled water followedby rinsing through the Levine tube with 50 cc of watercaused a prompt increase in the pH value. The peakof this rise is conditioned by the pH of the alkalinesolution, whereas the plateau level immediately follow-ing is the pH of the alkali and gastric content mixture.The duration of the plateau, shown by the gentlysloping curve which is terminated by the sudden dropto a low level, is controlled by the amount of alkaliadded, the rate of acid secretion and the intermittentemptying of the stomach. The amount of emptyingcan be calculated if the gastric contents are measuredafter the pH has returned to the low level. By con-trolling the variables interesting data may be obtainedon the efficacy of antacids and the rate of gastric secre-tion. Information pertaining to these experiments aswell as further details concerning the method will bepublished elsewhere.We are greatly indebted to Dr. N. R. Trenner for

valuable suggestions as well as the construction of theglass electrodes and to Mr. L. Fernandez, who assistedduring the earlier part of the experiments.

JAMES FLEXNERMICHAEL KNIAZUK

THE MERCK ISTITUTE or THERAPEUTICRESEARCH,

RAHWAY, N. J.JAN NYBoER

NEW YORK POST-GRADUATE MEDICALSCHOOL AND HOSPITAL,

NEW YORK, N. Y.

CHROMOSOMES FROM LEAVESA MODIFICATION of Warmke's' method for making

root-tip smears has been found by the writer to beeffective for studying chromosomes in the leaves ofcertain plants: place young leaves in Carnoy's solution(3 parts chloroform, 2 parts absolute alcohol and 1part glacial acetic acid) for five or more minutes;transfer momentarily to a solution of equal parts of 95per cent. alcohol and concentrated hydrochloric acid;put the leaves back into Carnoy's, and, after severalminutes, smear in iron aceto-carmine.By this method the chromosomes of a number of

genera have been investigated: Smilax L. (Liliaceae),Sedum L. (Crassulaceae), Cercis L. (Leguminosae),Punica L. (Punicaceae), Sanicula L. (Umbelliferae),Pyxidanthera Michx., Diapensia L., Shortia Torr. andGray, Schizocodon Sieb. and Zucc., and Galax L. (Dia-

l H. E. Warmke, Stain Technology, 10: 101-103, 1935.

pensiaceae), Chimaphila Pursh (Ericaceae), and Plan-tago L. (Plantaginaceae). Metaphase drawings of twospecies are shown here for purposes of illustration:Fig. 1, Sedum pusillum Michx., from Stone Mountain

FIG. 1. Sedum pusillum Michx., 2n =8, ca. 3800 x.FIG. 2. Cercis canadensis L., 2n = 14, ca. 4500 x.

in Georgia, with 8 somatic chromosomes, the lowestnumber known for the extremely varied family; andFig. 2, Cercis canadensis L., four trees on the groundsof the College of William and Mary, with 14 somaticchromosomes. Senn2 reported a 2n-number of 12,n-number of 6, for this species; his drawing of meioticchromosomes suggests an interpretation of two biva-lents in contact to be a single bivalent; his somaticnumber (not figured) was determined from an anther-wall division. The only other investigated species ofCercis has 14 and 7 chromosomes, respectively.3

J. T. BALDWIN, JR.COLLEGE OF WILLIAM AND MARY2 H. A. Senn, Bibliogr. Genetica, 12: 175-336, 1938.3 R. Corti, Nuovo Giorn. Bot. Ital., N. B., 37: 679-680,

1930.

BOOKS RECEIVEDDE BROGLIE, Louis. Matter and Light; the New Physics.

Pp. 300. Norton. $3.50.FLEMING, J. A., Editor. Terrestrial Magnetism and Elec-

tricity. Vol. VIII, Physics of the Earth. Pp. xii +794. Illustrated. McGraw-Hill. $8.00.

FRASER, CHELSEA. Heroes of the Air. Pp. xl + 846.Illustrated. Crowell. $2.50.'

FURNAS, C. C. The Storehouse of Civilization. Pp. xx +562. Illustrated. Teachers College, Columbia Uni-versity. $3.25.

GASSER, HERBERT S. and others. Symposium on theSynapse. (Reprinted from the Journal of Neurophysi-ology.) Pp. 361-474. 25 figures. Charles C Thomas.

GRAHAM, HARVEY. The Story of Surgery. Pp. xv + 425.23 plates. Doubleday, Doran. $&75.

HAUSMANN, ERICH. Physics. Second edition. Pp. vi +756. 469 figures. Van Nostrand. $4.00.

HIBBEN, JAMES H. The Baman Effect and its ChemicalApplications. Pp. 544. Reinhold. $11.00.

HUDDLESON, I. FOREST and others. Brucellosis in Manand Animals. Pp. xvii + 339. 40 figures. Common-wealth Fund, New York. $3.50.

MAcDOUGALL, F. H. Thermodynamics and Chemistry.Third edition. Pp. ix + 491. Wiley. $5.00.

ROBBINS, WILLIAM J. and HAROLD W. RICKETT. Botany;a Text-book for College and University Students. Thirdedition. Pp. vii + 658. 440 figures. Van Nostrand.$3.75.

ROUSH, G. A. Strategic Mineral Supplies. Pp. xvii +485. McGraw-Hill. $5.00.

SZEG6, GABOR. Orthogonal Polynomials. Vol. XXIII,American Mathematical Society Colloquium Publica-tions. Pp. ix + 401. The Society, New York.

Treatment in General Practice; the Management of SomeMajor Medical Disorders. A symposium. Vol. I, pp.x + 259. Vol. II, pp. xii + 436. Little, Brown. $7.50.

240 SCIENCE

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FIRST COURSE IN THE THEORYOF NUMBERSBy HARRY N. WRIGHT, Associate Professor of Mathematics, The Col-lege of the City of New YorkA usable, moderate-priced textbook covering essentially what is incor-porated in most courses in the elementary theory of numbers. The meth-ods of proof employed are the standard ones. The text includes a largenumber of excellent exercises.Approximately 131 pages; 5i by 8i; Probable price $2.00

HOUSEHOLD PHYSICSBy WALTER G. WHITMAN, Head of the Department of Physical Sci-ence, State Teachers College, Salem, MassachusettsThe third edition of " Household Physics " constitutes a thorough revisionand rewriting, and the content is now completely up to date. The bookhas had to be somewhat enlarged, due to the recent data which have beenincorporated. The content follows along practical lines and includesmuch new equipment available today for the home. Three entirely newchapters are presented, dealing with "Protection against Fire," "VisualAids," and "Photography."436 pages; 6 by 9; 412 illustrations; $3.00

FUNDAMENTAL PROCESSES OFELECTRICAL DISCHARGE IN GASESBy LEONARD B. LOEB, Professor of Physics, University of CaliforniaThis up-to-date volume relates modern atomic physics to the field of dis-charge through gases. It reviews the classical studies and brings thosestudies up to the present day in an expert and critical survey.Approximately 842 pages; 6 by 9; 379 illustrations; Probable price $6.00

CALCULATIONS OF QUANTITATIVEANALYSISBy CARL J. ENGELDER, Professor of Analytical Chemistry, Univer-sity of PittsburghA logical, systematic sequence of problem assignments, in fifteen weeklysets, is presented in this book to cover and supplement the usual more orless standard conventional semester 's work in elementary quantitativeanalysis. Each problem set consists of twenty problems, a total of threehundred; a discussion of theory, together with numerous illustrative ex-amples, accompanies each problem set. The order of development is de-signed to keep abreast of the laboratory work.Approximately 172 pages; 6 by 9; Probable price $2.00

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