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Williams' Personal Hygiene AppliedNEW (6th) Just Ready-after a revision so thorough that the text had to be completelyED I T ION remade and enlarged by more than 100 pages.

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Heilbrunn's General PhysiologyBRAN D Just Ready!-The immediate success of this brand new textbook demonstrates

NEW BOOKI beyond words how thoroughly Dr. L. V. Heilbrunn has met the need for justsuch a book. It is an excellent presentation based on the author's own experience as a teacher andhas been thoroughly proved in the classroom.The morphology of living cells and their physico-chemical make-up; nutrition, digestion, respira-tion, secretion, etc.; energy relations, environmental effects, acclimatization, irritability, conduction,reproduction, etc., and many more subjects of particular importance are thoroughly explained toround out an unusually concise but complete presentation of the entire subject as it is known today.By L. V. HEILBRUNN, Associate Professor of Zoology in the University of Pennsylvania. 603 pages, illustrated. Cloth,$5.00 net.

BOLDUAN'SPUBLIC HEALTH and HYGIENESecond Edition-Bolduan's Public Health andHygiene is a clear and connected considerationof modern public health knowledge. Funda-mentals are emphasized, including disease trans-mission and disinfection methods, while specialattention is given to communicable diseases andtheir prevention.BY CHARLES FREDF,RICK BOLDUAN, M.D., Director, Bureauof Health Education, City of New York; and NILS W.BOLDUAN, M.D. 12mo of 371 pages, illustrated. Cloth,$2.75 net.

KRUEGER'S FUNDAMENTALSOF PERSONAL HYGIENESecond Edition-This is not a textbook of iron-clad rules but one of forceful suggestions thatdirect the student toward a clear understandingof personal hygiene and how it influences hisdaily life. Because of its increasing impor-tance Professor Krueger lays special stress onmental hygiene.By WALTER W. KRUEGER, PH.B., Instructor in the GrandRapids Junior College. 12mo of 294 pages, illustrated.Cloth, $1.75 net.

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2 AWIENGE-ADVERTISEMENTS

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.TEMBER 3 1937 SCIENCE-ADVERTISEMENTS 7

CENCO-_> HIARRINGT'ON

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SCIENCE-ADVERTISEMENTS VOL. 86, NO. 22278

VOL. 86, No. 2227

itself. When the counter has completed its stroke ashort-circuiting contact is made which momentarilyreduces the anode potential to a value low enough tostop the current flow, whereupon the contact opens asthe counter armature returns and awaits the nextheart beat. It will be noted that this contact operatesafter the stroke has been completed, and thereforeimperfections in the contact cause no inaccuracy in thecount, provided only that the potential is reduced foran instant below the ionization value before the nextbeat.A telephone message counter in which the original

armature has been replaced with one made from 1/32inch steel has been found to work perfectly as acounter up to 235 strokes per minute (this high ratewas secured by artificial means). It is not necessaryto use other contacts if a graphic record of the beatis desired, as a thread connected to a recording pencan be attached to a flat spring which is placed so thatit is hit by the counter armature near the end of itsstroke. The counter and other parts of the outputcircuit must be well shielded, as must the circuitsassociated with the first amplifier stage. Also, thefirst 6F5 tube must be carefully selected, as about 30per cent. of the tubes commercially available seem tohave a very high hum level or are defective in otherways.

This apparatus seems to be very dependable inoperation. It is only necessary to attach the elec-trodes, turn the amplifier on and adjust the amplifica-tion so that the meter needle swings well above thepoint at which the trigger action occurs. The settingis not at all critical. If the amplification is more thanabout 15 fold above this value, multiple counts mayoccur due to electric feed-back between the counterand amplifier, but, in practical use, such high ampli-fication is not necessary. When the electrodes areproperly placed, the uninsulated subject can engagein any sort of violent activity without affecting thecount.

FIG. 1. The electric cardiometer.

The device seems particularly well adapted to thegraphic recording of rate in connection with mag-netic-clutch operated interval recorders as describedby Fleisch3 and by Gesell.4 Additional contacts arenot necessary; the magnet coil of the Fleisch appara-tus, for example, is simply placed in series with theresistance R. (see Fig. 1), which is reduced to com-pensate for the resistance of the coil. Experiments inprogress indicate that a differentially wound magnetcoil for the clutch is even better, as the anode currentof the gas-triode can then release the clutch while atthe same time the counter is being actuated. Theclutch is "off" for the duration of the counter stroke,which seems to be reasonably constant and which maybe varied within limits by changing capacitor C. andassociated resistors.

FRANKLIN HENRYUNIVERSITY OF CALIFORNIABERKELEY

5 A. Fleisch, Am. Jour. Psychol., 45: 335, 1933.4 R. Gesell, SCIENCE, 79: 275, 1934.

BOOKS RECEIVEDBAUGHIMAN, IMO P. Elementary Chemistry. Second edi-

tion, revised. Pp. 296. 19 figures. Lea and Febiger.$2.75.

BAWDEN, ARTHUR T. Man's Physical Universe. Pp.xvii + 812. 368 figures. Macmillan. $3.50.

COLLINs, KREGH. Tricks, Toys and Tim;; A Book ofModel-making and Magic. Pp. xii + 238. Illustrated.Appleton-Century. $2.00.

CRAMER, HARALD. Cambridge Tracts in Mathematics andMathematical Physics. No. 36-Random Variables andProbability Distributions. Pp. 120. Cambridge Uni-versity Press, Macmillan. $2.25.

DARWIN, CHARLEs. The Origin of Species. (Condensed).Pp. 112. Quarter Books, Los Angeles. $0.25.

ENGLISH, 0. SPURGEON and GERALD H. J. PEARSON. Com-mon Neuroses of Children and Adults. Pp. 320. $3.50.

KOLTUOFF, I. M. Acid-base Indicators. Translated byCHARLES ROSENBLUM. Pp. ix + 414. Macmillan. $7.00.

LANDfi, ALRED. Principles of Quantum Mechanics. Pp.vii+ 115. 15 figures. Macmillan. $2.25.

SHRADER, J. EDMOND. Physics for Students of AppliedScience. Pp. ix + 638. 581 figures. McGraw-Hill.$4.00.

TIMOSHENKO, S. and D. H. YOUNG. Engineering Me-chanics; Dynamics. Pp. xii + 324. 314 figures. $2.75.Engineering Mechanic; Statics. Pp. xiv + 334. 464figures $2.75. McGraw-Hill.

TOumEY, JAmEs .W. and CLARENCE F. KoRSTIAN. Foun-dations of Silviuulture upon an Ecological Basis. Sec-ond edition, revised. Pp. xxi + 456. 22 figures. Wiley.$4.50.

TREWARTHA, GLENN T. An Introduction to Weather andClimate. Pp. ix + 373. 108 figures. McGraw-Hill.$3.00.

WILLCOX, 0. W. ABC of Agrobiology. Pp. 323. 22figures. Norton. $2.75.

WILIAMS, SAMUEL R. Foundations of College Physics.Pp. x + 630. 531 figures. Ginn. $4.00.

WINSLOW, C.-E. A. and SAVEL ZIMAND. Health underthe "El"; The 8ellevue Yorkville Health Demonstra-tion in Mid-town New York. Pp. xiii + 202. Illus-trated. Harper. $2.25.

YATrEs, RAYmoND F. How to Make Electric Toys. Pp.xvi + 199. Illustrated. Appleton-Century. $2.00.

230 SCIENCE

SEPTEMBER~~~~ ~ ~ ~

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form, those fundamentals which are nec-essary to give the technical student aworking knowledge of physics. The mate-rials included, the arrangement of topics,and the manner of presentation reflectthe author's experience in years of teach-ing physics to engineering and art studentsand in his own research and consultingwork. Preliminary editions of the bookhave been used in the author's coursesfor the past five years.The arrangement of material, by whichmechanics and heat are followed first byelectricity and then by wave motion,sound and light, is that which seems tothe author most logical and best suited tothe needs of the student for the pursuit

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SEPTEMBEM 3, 1937 SCIENCE-ADVERTISEMENTS 9

SCIENCE-ADVERTISEMENTS

GENERALBIOLOGY

ANATOMYPHYSIOLOGY

textbooks for fall classes !WHITE'SGENERAL BIOLOGYA new edition, just published. It was entirelyrevised to bring the material up-to-date and toalso give the chapters better sequence. Beinga book on general biology the material is bal-anced so that there is as much on botany as thereis on zoology. It covers both subjects com-pletely and can be used successfully in the onesemester course or in a one year course withoccasional outside reading. Fundamentals arestressed. Many original illustrations are usedto visibly explain the fundamentals. A labo-ratory manual, by the same author, accompaniesthe textbook.

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ZOETHOUT'STEXTBOOK OF PHYSIOLOGYThis book continues to serve physiologists as theideal college physiology textbook. Its size isbetween the small elementary and the large med-ical texts. It has been successful in giving thestudent a well-rounded understanding of thesubject. The material is comprehensive andeffectively presented in "every-day English."Heavy, technical terminology has been avoided.Unproved theories have also been avoided.Cross references have been used to show theinterdependence of one organ on another andpermit the teacher to interchange the sequenceof chapters if he desires to. There is a labora-tory manual with experiments concurring withthe material of the textbook. These two bookshave been highly satisfactory in the classroom.

TEXTBOOK OF PHYSIOLOGY-W. D. Z6etiout,Ph.D., Professor of Physiology in the ChicagoCllegeof Dental Surgery (Loyola University). 694 pages;271 illustrations; price, $4.00.

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The Scientific Aspectsof Flood Control

Three illustrated papers presented at the Roches-ter meeting of the Association in cooperation withthe Ecological Society of America, by F. A. Silcox,Chief of the U. S. Forest Service, Dr. W. C. Lowder-milk, Associate Chief of the Soil Conservation Ser-vice, and Dr. Morris L. Cooke, Chief of the RuralElectrification Administration. These three paperspresent the serious problems arising from failureto control flood waters at their source and the soilerosion resulting from this neglect, and the stepsthat are being taken towards permanent control.

Price prepaid 50 cents

Some Fundamental Aspectsof the Cancer Problem

Symposium sponsored by the Section on MedicalSciences at Atlantic City, N. J., published under thedirection of the following committee of workers inmedical science: William Charles White, Chairman;Vincent du Vigneaud, C. C. Little, Esmond R. Long,and Carl Voegtlin. Edited by Henry B. Ward.These papers bring out the advances recently madein cancer research by leading investigators alongthe three main approaches to the problem: biology,chemistry and physics. A summary of the paperswill be found in Science for February 5, 1937.

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