The Evolution of Laboratory Hardware · Prof.Louis Trenchard More of charts not otherwise conveniently available, and Author of "Life of Newton" drill problems based on the same.

NEW SERIES SUBSCRIPTION, $6.00VOL. 99, No. 2565 FRIDAY, FEBRUARY 25, 1944 SINGLE COPIES, .15

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2 SOIENGEADVERTISEMENTAS VoL. 99, No. 2565~~~~~-WANTED-PHYSICIST

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By Prof. Louis Trenchard More cipal tables and reproductions of the principal typesProf.Louis Trenchard More of charts not otherwise conveniently available, andAuthor of "Life of Newton" drill problems based on the same. Features the

new type of projection used for star charts (8 inThis is the truly dramatic story of one color). Thorough treatment of the problems ofof the greatest scientists of any age, relative movement. A standard notation usedthe man who made possible the transi- throughout. $4.50, subject to discount.tion from alchemy to modern science. A supplementary volume, WAVES ANDAvoiding a narrow and technical treat- WEATHER FOR NAVIGATORS (John Q.-ment, Professor More has created a Stewart), will follow shortly.work of absorbing interest to the layand professional scientist. $4.50 GINN AND COMPANY

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SCIENCE-ADVERTISEMENTS VOL. 99, No. 25652

SCIENCE-ADVERTISEMENTS

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SCIENCE-ADVERTISEMENTS VOL. 99, NO. 25654

NEW YORK, N. Y.161 SIXTH AVE.

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6 SCIENCE-ADVERTISEMENTS

THE "LUMETRON"

PHOTOELECTRIC FLUORESCENCE METERThe Model 402EF Fluorescence Meter is the most complete model in the line of LjunetronPhotoelectric Colorimeters. Its applications include measurement of fluorescence, transmis-sion, turbidity, ultraviolet absorption and reflection. It is particularly suited to the de-termination of Vitamin B1 (thiochrome and diazonium salt reaction), Vitamin A by ultra-violet absorption; also Vitamin D, nicotinic acid, iron and carotene by transmission in thevisible range.

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VOL. 99, No. 25656 SCIENCE-ADVERTISEMENTS

SCIENCE-ADVERTISEMENTS

7e t1em RYKER MODEL M-11

REFLECTING STEREOSCOPE

Above: M-11 STEREO-SCOPE on Bracket Sup-port can be screwed to anytable-top. It will accom-modate photos up to 10 x 12inches. Shown is a pairof 10 x 10-inch pictures.

MAGNIFICATION RANGE wm 3.6X m 7XThe M-11 Stereoscope's clear brilliant image,wide field of view, increased range of magnifica-tion and greater operating convenience combineto set a new high standard of optical efficiency.Vertical adjustment of the instrument on its sup-port rod, coupled with the wide focusing range ofour Binoculars and use of simple, supplementarylens-inserts gives an uninterrupted magnificationrange from 3.6X to 7X.Since stereoscopic perception varies as the square ofthe magnification, ability to surely identify fine de-tail is over three times greater at 7X than at 4X

(the standard magnification of older military typeinstruments) .

A simple adjustment permits the distances fromeyes to photos to be made unequal, thus varyingthe magnification through each eyepiece, and per-mitting fusion of picture-pairs differing in scale upto about 15%.The field of view without Binoculars is extremelywide . . . accommodating the entire 70% overlaparea of a pair of 9 x 9-inch photos.Available either with or without Binocular Magni-fier, which may be purchased as optional equipment.The M. 11 Stereoscope permits faster, far moreaccurate identification of detail in aerial photo-graphs.

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FIEBRUAF.Y 25p 1944 7

8 CEC-DETSMNT o.9,N.26

Accuracy that Countson all Fronts

At first glance there would seem to be little re-lationship between an intricate, ten-foot longheight finder and a microscope objective withlenses of less than one millimeter in radius. Yetboth are the products of the same eyes, the samefacilities, the same standards of accuracy, thesame experience. Both are aiding in America'swar effort. Both are products of Bausch & Lomb.The lens computing and grinding skills that for

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instruments, pioneered and fostered by Bausch &Lomb through years of peace, has become ahighly valued asset to an America at war. Hereagain, because of its wartime accomplishments,Bausch & Lomb will be able to extend its opticalservices topeacetime pursuitswhen Victory iswon.

Bausch & Lomb Oil Immersion Objective-97X-N.A. 1.25.

For Bausch & LombInstruments essential to

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AN AMERICAN SCIENTIFIC INSTITUTION PRODUCING OPTICAL GLASS AND INSTRUMENTSFOR MILITARY USE, EDUCATION, RESEARCH. INDUSTRY AND EYESIGHT CORRECTION

8 SCIENCE-ADVERTISEMENTS VOL. 99, No. .0565

SCIENCE

VOL. 99 FRIDAY, FEBRUARY 25, 1944 No. 2565

James McKeen Cattell-In Memoriam Scientific Events:Organiser of American Science: DR. EDWIN G. The Greenwich Royal Observatory; The InstituteCONKLIN ...................................... 151 of Technology and Plant Industry at the Southern

Contributions to Psychology and Education: D. Methodist University; The Argentine Citizens Dec-EDWARD L. THOaNDIKE . .......... 154 laration; Award of the Willard Gibbs Medal ............ 165

As I Knew Him in the American Association for Scientific Notes and News .166the Advancement of Science: DL BURTON E. Science News .10

LIVINGSTON ..................................... 155His Service to Science: DR. ANTON J. CARLSON ...... 158Resolution of the Executive Committee .............................. 159 SCIENCE: A Weekly Journal devoted to the Advance-Somne Personal Characteristics: Da. R. S. WOOD- ment of Science. Editorial communications should be sentWoR1TH.0 to the editors of SCIENCE, Lancaster, Pa. Published everyWOr RTH .......................................................................... 160 ri ay bThe Psychological Corporation: DR. PAUL S. Friday byACHILLES ...... ................. ................ 161 THE SCIENCEPRESS

Science Service: WATSON DAVIS ....................................... 162 Lancaster, PennsylvaniaIn Memoriam: DR. L. 0. HOWARD ......................... 163 Annual Subscription, $6.00 Single Copies, 15 Cts.Leader in Science: DR. G. H. PARKER .............................. 163 SCIENCE is the official organ of the American Associa-Humanitarian-A Reminiscence: DR. HENRY NOR- tion for the Advancement of Science. Information regard-

RIS RUSSELL.164 ing membership in the Association may be secured FromRISRusSELL ~~~~.............................................................................................16 inmebrh p n t e Aso a in m y be e u ed r m

the office of the permanent secretary in the SmithsonianCourageous Leader: DR. W. F. G. SWANN ........................ 164 Institution Building, Washington 25, D. C.

JAMES McKEEN CATTELL-IN MEMORIAMORGANIZER OF AMERICAN SCIENCE

By Dr. EDWIN G. CONKLINPRINCETON UNIVERSITY

THE measure of a man's influence on science in hisown and future generations may be taken (1) by hispersonal contributions to knowledge in his chosen fieldand (2) by his contributions to the organization ofagencies, facilities and institutions which serve to co-ordinate and implement the labors of others. Theformer may be called his individual, the latter hissocial contributions to the advancement of science.Measured by either of these scales the work of J.McKeen Cattell was very important. His work beganand his reputation was made with detailed work inexperimental psychology. For ten years from 1885to 1895 his published work was limited to researchesin this field and resulted in more than thirty contribu-tions from the psychological laboratory. Throughouthis long life he maintained active interest in psycho-logical research and its influence permeated all hislater work.The social aspect of his work, represented by the

organization of science and scientists, had its rise andcenter in his work as editor and publisher of scientific

journals and the opportunities which this brought him.The weekly journal SCIENCE, which he acquired in1894, became under his ownership and editorial man-agement one of the most important factors in theorganization of science in America. A brief reviewof the earlier and later history of this journal willindicate the nature of the problem which it posed andthe splendid way in which Cattell met it.

Science, An Illustrated Journal published weekly,was started in 1883 and was published first at Cam-bridge, Mass., by The Science Company. I havefound no statement of the persons composing thiscompany, but it is known that Alexander GrahamBell and one other person gave it large financial sup-port. From 1883 to 1885 S. H. Scudder was editorand N. D. C. Hodges assistant editor. From 1885until 1894, when its publication suddenly ceased, N.D. C. Hodges served as editor and his name replacesthat of The Science Company on the title page, indi-cating that he was the owner. Volumes I to IXappeared in a format similar to that of Nature, with