w ^d1-~~~w ^d1 ci lassachu! newseries fi subscrpton, $6.00 vol. 83, no. 2158 frday, m 8 single...

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cI lassachu! -~~~ W ^d1 NEW SERIEs FI SUBSCRPTON, $6.00 VOL. 83, No. 2158 FRDAY, M 8 SINGLE COPIS, .15 NEW BLAKISTON BOOKS WARDLE-General Entomology A new course for students training for the profession of zoology or agriculture, and who do not require the detailed knowledge of insect classification essential to the professional entomologist but do require a broad appreciation of basic principles. 96 Illustrations. Ready in May By ROBERT A. WARDLE, Professor of Zoology, University of Manitoba, Winnipeg BREMER-Textbook of Histology-New Edition This standard classroom text has been so thoroughly revised that it is essentially a new book. The text has been rewritten and is now the work of Dr. Bremer and his associates rather tbln a revision of Lewis and Stohr. There are 101 new illustrations, all original. About 500 Illustrations. Ready in June By J. L. Bremer, Associate Professor of Histology, Harvard Medical School EAST-Medical Aspects of Crime It is a modern, illustrated and authoritative guide for all who give serious thought to the problem of the causes and cure of crime. 18 Illustrations (81 Figures). Fabrikoid $6.50 By W. NoRwoOD EAST, M.D., F.R.C.P., H.M. Commissioner of Prisons and Director of Convict Prisons (England). With a foreword by The Rt. Hon. Sir John Simon, M.P., Secretary of State (Eng.) 5 NEAL and RAND-Comparative Anatomy A new presentation for college classroom use. The facts presented not only throw light upon the important problem of man's place in nature, but also help the student to understand the major functions.of his body. The discussion of each organ or organ-system is divided into three parts-phylogenesis, ontogenesis and anatomy. Thoroughly Illustrated. Ready June By H. V. NEAL, PH.D., Sc.D., Professor of Zoology, Tufts College; and H. W. RAND, PH.D., Assoc. Prof. of Zoology, Harvard University 5 WALTON and FOSS-Social Biology A new high school biology based upon the concept of unity in nature. The treatment closely follows the recommendations of the 31st year-book of the National Society for the Study of Edu- cation, which summarizes the experience and latest opinions of many distinguished educators. 360 Illustrations. Washable Covers $1.68 By EVERETT P. WALTON, A.B., and PHIIP E. Foss, A.M., Hartford Public High School, Hart- ford, Conn. P. BLAKISTON'S SON & CO., INC., 1012 WALNUT STREET, PHILADELPHIA, PA. Entered a8 second-class matter July 18, 1923, at the Post Office at Lancaster, Pa., under the Act of March 3, 1879.

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Page 1: W ^d1-~~~W ^d1 cI lassachu! NEWSERIEs FI SUBSCRPTON, $6.00 VOL. 83, No. 2158 FRDAY, M 8 SINGLE COPIS,.15 NEW BLAKISTON BOOKS ¶ WARDLE-GeneralEntomology Anewcourse for students training

cIlassachu!

-~~~W ^d1NEW SERIEs FI SUBSCRPTON, $6.00VOL. 83, No. 2158 FRDAY, M 8 SINGLE COPIS, .15

NEW BLAKISTON BOOKS¶ WARDLE-General EntomologyA new course for students training for the profession of zoology or agriculture, and who do notrequire the detailed knowledge of insect classification essential to the professional entomologistbut do require a broad appreciation of basic principles.96 Illustrations. Ready in MayBy ROBERT A. WARDLE, Professor of Zoology, University of Manitoba, Winnipeg

¶ BREMER-Textbook of Histology-New EditionThis standard classroom text has been so thoroughly revised that it is essentially a new book.The text has been rewritten and is now the work of Dr. Bremer and his associates rather tbln arevision of Lewis and Stohr. There are 101 new illustrations, all original.About 500 Illustrations. Ready in JuneBy J. L. Bremer, Associate Professor of Histology, Harvard Medical School

¶ EAST-Medical Aspects of CrimeIt is a modern, illustrated and authoritative guide for all who give serious thought to the problemof the causes and cure of crime.18 Illustrations (81 Figures). Fabrikoid $6.50By W. NoRwoOD EAST, M.D., F.R.C.P., H.M. Commissioner of Prisons and Director of ConvictPrisons (England). With a foreword by The Rt. Hon. Sir John Simon, M.P., Secretary of State(Eng.)

5 NEAL and RAND-Comparative AnatomyA new presentation for college classroom use. The facts presented not only throw light uponthe important problem of man's place in nature, but also help the student to understand themajor functions.of his body. The discussion of each organ or organ-system is divided into threeparts-phylogenesis, ontogenesis and anatomy.Thoroughly Illustrated. Ready JuneBy H. V. NEAL, PH.D., Sc.D., Professor of Zoology, Tufts College; and H. W. RAND, PH.D.,Assoc. Prof. of Zoology, Harvard University

5 WALTON and FOSS-Social BiologyA new high school biology based upon the concept of unity in nature. The treatment closelyfollows the recommendations of the 31st year-book of the National Society for the Study of Edu-cation, which summarizes the experience and latest opinions of many distinguished educators.360 Illustrations. Washable Covers $1.68By EVERETT P. WALTON, A.B., and PHIIP E. Foss, A.M., Hartford Public High School, Hart-ford, Conn.

P. BLAKISTON'S SON & CO., INC., 1012 WALNUT STREET, PHILADELPHIA, PA.

Entered a8 second-class matter July 18, 1923, at the Post Office at Lancaster, Pa., under the Act of March 3, 1879.

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2 SCIENCE-ADVERTISEMENTS VOL. 83, No. 2158

First Authorized English Translation

Theodor Brinkmann'sECONOMICS

OF

THE FARM BUSINESSWith an introduction and notes by Elizabeth

Tucker Benedict, Heinrich Hermann Stippler, andMurray Reed Benedict.Now available to students of agricultural eco-

nomics and farm management, for the first time,in English.

Pp. ix + 1-163 index

Social Science Research CouncilAdvisory Committee on Social and Economic

Research in Agriculture.Translation Series, No. 2

Price, cloth, $2.00

Published by

UNIVERSITY of CALIFORNIA PRESSBERKELEY : : CALIFORNIA

TheFoundations of .Science

By H. POINCAREPp. xi + 553.

Containing the authorized En-

glish translation by George

Bruce Halsted of "Science and

Hypothesis," "The Value of

Science" and "Science and

Method," with a special preface

by Poincare, and an introduc-

tion by Josiah Royce. Price

postpaid, $5.00.

THE SCIENCE PRESSGrand Central Terminal New York, N. Y.

JOURNAL OF MORPHOLOGYPublished by The Wistar Institute

C. E. McClung, Managing Editor, University of Pennsylvania

Vol. 59 Contents for June, 1936 No. 2C. Wm. ROBERTSON. The metamorphosis of Drosophila melanogaster, including an accurately timed

account of the principal morphological changes. Four plates.E. C. OLSON. Dorsal axial musculature of certain primitive permian tetrapods. Twelve text figures.J. A. CAMERON. The origin of new epidermal cells in the skin of normal and x-rayed frogs. Four text

figures and two plates.C. L. TURNER. The absorptive processes in the embryos of Parabrotula dentiens, a viviparous, deep-sea

brotulid fish. Two plates.G. BEVELANDER. Branohial glands in fishes. One plate.S. MoREis. Studies of Endamoeba blattae (Biitschli). Two text figures and three plates.B. R. SPEICHER. 0Mgenesis, fertilization and early cleavage in Habrobracon. Two plates.

Price $12.00 per volume, Domestic; $12.50 per volume, ForeignIssued quarterly

Many early volumes are still available. Prices upon request

Address subscriptions to

The Wistar Institute of Anatomy and Biology36th Street and Woodland Avenue

Philadelphia, Pa., U. S. A.

SCIENCE-ADVERTISEMENTS2 VOL. 83, NO. 2158

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SCIENCE-ADVERTISEMENTS

Here's a ProjectorYOU CAN USEAT YOUR OWN DESK!

The Spencer Model "B" Delineascope permits you to lecture to your class, illustrate specificpoints with glass slides-and still remain seated at your own desk in the front of the room. Noneed to stand up to operate the projector yourself at the back of the room; no need to have it oper-ated by an inexperienced student. You sit facing your class, all your lecture notes and facts at yourfinger tips, the projector on your desk ready for instant use. It is the ideal way to use visual edu-cation in teaching.

In operating the projector, you place the glass slide right side up on the slide track. The imageon the screen is shown to your class exactly as the slide appears to you. Using a pencil you can pointout, on the slide, the specific object under discussion-and the image of the pencil appears as a pointeron the screen.

MODEL "6D"For glass slides only. Canbe equipped to project film-slides and micro-slides.Ideal for daily classroom MODEL "VA"use. Three purpose combination

delineascope. Projectsopaque material or glass

MODEL "B" slides and can be equippedto project filmslides andOverhead Delineascope pro- micro-slides. A universaljects glass slides and trans- projector giving brilliantparent biological specimens. pictures on the screen.

Write for Folder :K78 which completelydescribes, with prices, our complete ilne ofDelileascopes. Please address Dept. A-5.

Spencer Lens CompanyDuffia 1o Sl New York

MAY 8, 1936 3

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SCIENCE-ADVERTISEMENTS

me4tZ44n

You can reach me by telephone"you say it casually, but there

is assurance in your voice. Foryou can depend on telephoneservice. You call a number and avoice answers-across the streetor across a continent. It's so easyto do-you have been doing itfor years. Use has dimmed thewonder of the telephone.Yet the wonder grows- there

is no ending to telephone prog.ress. Service is quicker, clearerand more accurate. Improve-ments are made each year. Thingsonce thought impossible are nowaccomplished fact. Tomorrowwill see still greater achievement.e That is the pioneering spiritof American enterprise. Ameri.can initiative and Americanresourcefulness have giventhis country the best telephoneservice in the world.Obviously this did not just

happen. It has been broughtabout by the development of theBell System over the past half-century. Time has proved therightness of its plan of operation.Quick, dependable, universalservice makes it possible for youto talk to almost every one,everywhere, and to say confi-dently-"You can reach me bytelephone."

BELL TELEPHONE SYSTEM

VOL. 83, NO. 2158

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SCIENCE-ADVERTISEMENTS

PYREX

KJELDAH L

WITHTAPERED NECKSFOR ACCURATESTOPPER FIT

PYREX Brand Kjeldahl Flasks (Catalogue No. 1760) arenow accurately sized to take standard rubber stoppers.(See list below.)This improved design speeds up Kjeldahl determinations

by providing quicker, more precise fitting of stoppers. Itprolongs the life of stoppers through easier and more uni-form fit. It minimizes the possibility of breaking the flaskwhen inserting the stopper. And, in addition, the neck ofthe flask has been given increased mechanical strength.These improved Kjeldahl Flasks may be obtained from

your regular dealer at no increase in price."PYREX" is a registered trade-mark and indicates manufacture by

CORNING GLASS WORKS * CORNING, N. Y.LOOK FOR THIS

TRADE-MARK STOPPER SIZESFlask Volume Rubber Stopper

100o ml No. 2{PYREX 300 ml No. 5\ 800 ml No. 6PYREX sR^ND LA B ORAT8ooml No. 7

PYREXBRANDLAOAOYWR

MAY 8, 1936 5

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6 CEC-DETSMNT O.8,N.25

NEWALL STEEL CABINET

FOR

MICROSCOPE SLIDES

CENCO THREE DRAWER UNITCapacity-1680 Slides

THE Cenco All Steel Microscope Slide Cabinet isTconstructed and finished exactly the same as

the standard office filing cabinets and will fit intopresent assemblies of letter files, etc. The drawersare fitted with Cenco-Scott Metal Microscope Slideholders in which the slides are supported vertically.Each drawer has 280 grooved positions for slidesinto which a total of 560 slides may be placed, twoback to back in each grooved position. The totalcapacity of the unit with this arrangement of theslides is 1680 slides. Four small indentations onthe top of one unit receive the four round feet onthe bottom of a second unit to permit building ofstacks, which may be assembled more permanentlyby joining together by small bolts.

Over all dimensions: Width, 15i inches; height,9 inches; depth, 141 inches. Net weight, 42 lbs.

66465

MICROSCOPE SLIDE CABINET$36.50

CWMA slwf CQulL-ABoPA Owy S PPL1E-S

iPPaa{USE'SChernicalsNEw YORK- BOSTON -CHICAG O-ToRONTO-LoSANGELES

BOSTON CHICAGO79 Amherst St. 1700 Irving Pk. Blvd.

VOL. 83, No. 21586 SCIENCE-ADVERTISEMENTS

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Mi~~~~~~~~~~~ 8, 1936SCIENCE-ADVERTISEMENTS 7~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The Brooklyn Technical High School(Largest and most modern of its kind)

HIAVE INSTALLED

Hig'Oh FrequencyInduction Furnaces

For teaching melting andheat-treating.

They have a 35 kv-a. high frequency converter with a 17 lb. furnace in whichsamples of various steels and other metals are quickly and accurately made withlaboratory precision.Standard heat-treatment tests and other applications of this versatile tool aredemonstrated.They also have a 150 kw., 960 cycle generator operating a furnace in which 250lb. charges of steel can be melted in half an hour. Cast iron, bronze, brass, etc.can be melted still faster with all the advantages of accuracy of analysis andminimum chance of contamination. rThese boys are learning by the most advanced ofmodern methods.

Write todap for information about Ajax-Northrup furnaces

Ajax Etect\ ihwo\\IA+ 4 oraWC CLYOr

MAY 8, 1936 SCIENCE-ADVERTISEMENTS 7

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8 SCEC-DETSMNT O.8,N.25

This enlarged section shows narrow coil whichlowers Inertia of moving system.

NARROW COILGIVES GALVANOMETERSHORT PERIOD WITHHIGH SENSITIVITY

Those who measure radiation withthermopiles or temperatures with ther-mocouples will be interested in theseNarrow-Coil Galvanometers. Theyoffer the most advantageous combina-tions of high sensitivity and shortperiod available in our Type HS (high-sensitivity) group.The short period is made possible by

using a narrow coil and reducing themass of the moving element. Theeffect of magnetic impurities is mini-mized by a radial field. The internalthermal e.m.f. is negligible becausethe circuit is entirely of copper. Thecase is dust-proof. During transit andhandling, a coil clamp protects themoving system.

Approximate" Characteristics-L & N No. 2284Galvanometers

! Sensi- ResistanceList tivity* Period PriNo. Per M~M. (Sec.) Damping Coiil rc

atIM. (5) §

8.5 40 21 $115.002284-a Micro- 1.5 ohms olnms

lt

0.05 10 162284-b Micro- 7 ohms ohms 115.00

olt

2284-x As |__ifi _____________________________________________

l Sensitivity at least as high as stated. Other charac-teristics within 20 per cent.

* With critical damping resistance in series with gal-vanometer.

** External critical damping resistance.§ Including resistance of suspensions.

lT~1 LEEDS & NORTHRUP COMPANY

4926 STENTON AVENUE PHILADELPHIA, PA.I-__

MEASURING INSTRUMENTS, TELEMETERS, CON-TROL EQUIPMENTS, HEAT-TREATING FURNACES

J-ED22(2)

8 SCIENCE-ADVERTISEMENTS VOL. 83, NO. 2158

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SCIENCE

celebrated on April 29 when a convocation was heldin which speakers representing faculty, alumni andthe university administration participated.

The alumni cooperated in making the celebrationa success by holding special smokers and gatheringsin various sections of the country. The first of thesewas held in New York City on April 24, whenformer Governor Alfred E. Smith, president of theboard of trustees; Senator J. Henry Walters andGeorge W. Sisson, also members of the board; Chan-cellor Charles W. Flint, Dean Samuel N. Spring andDr. Hugh P.-Baker, now president of MassachusettsState Agricultural College, were the speakers.The institution opened in 1911 with the registration

of fifty-two students. Dean William L. Bray, nowhead of the Graduate School at Syracuse University,was in charge for the first and part of the secondsemesters. The school at that time occupied a cornerin the basement of Lyman Hall when Dr. Hugh P.Baker was brought from Penn State Forest School totake charge. He placed the college on a solid founda-tion and laid plans for its future development whichhave been largely fulfilled under his administrationand that of the late Dean Franklin Moon. A largebuilding was erected on the campus by state appro-priations and occupied in 1917. Another building wasconstructed for housing the scientific departments andoccupied in 1932.

In the meantime the college has grown from a classof fifty-two students to an enrolment of nearly 500with two modern college buildings and several separatecompletely equipped laboratories at Syracuse and alarge school building housing fifty Ranger School stu-dents at Cranberry Lake. During these years thecollege has acquired approximately 20,000 acres offorest lands in various sections of the state while theteaching staff, including the Ranger School, has grownfrom two to forty-seven.

GIFT OF THE GENERAL EDUCATIONBOARD TO THE MEMORIAL HOS-

PITAL, NEW YORK CITYTHE General Education Board, founded by John

D. Rockefeller, has appropriated the sum of threemillion dollars to the Memorial Hospital for the Treat-ment of Cancer and Allied Diseases. With this sumthere will be erected a twelve-story hospital buildingadjacent to the Rockefeller Institute for Medical Re-search, the New York Hospital and the Cornell Uni-versity Medical College. The property on which thenew hospital will be built is bounded by York andFirst Avenues and by Sixty-seventh and Sixty-eighthStreets. It is expected that ground for the projectwill be broken next autumn and that the building willbe completed within a year.

Harry Pelham Robbins, president of the hospital, inhis statement announcing the gift said:

This magnificent gift is a significant expression of thevision and generous spirit of the General EducationBoard and John D. Rockefeller, Jr.

It will create in North America for the first time amodern cancer institute even more broadly organized thanthose already existing in Rome, Milan and Buenos Aires.The scope of the project stirs the imagination.

Title to the property on which the hospital will bebuilt is held by the Rockefeller Institute for MedicalResearch, which it is said will transfer it to the hos-pital. The site, comprising three acres and valued in1934 at $900,000, was assembled, parcel by parcel, sev-eral years ago by Mr. Rockefeller, Jr., who intendedto turn it over to the Memorial Hospital as soon as theinstitution could raise the funds for a building. Thedepression made it impossible for the Memorial Hos-pital, with a deficit of $50,000, to do this. In Decem-ber, 1934, Mr. Rockefeller, Jr., gave the property tothe institute.The main building will house the service, adminis-

trative, laboratory, out-patient, ward and privatepatient facilities. There will be a nurses' home and, atsome future time, a unit to handle advanced cases.Garden areas will be placed in the center of the block.The present institution has only 110 beds, yet it

accepted 3,200 patients for treatment last year andthere are now more than 11,000 active cases under thecare of the hospital. There is a daily average of 325patients coming to the hospital and its nine clinics andx-ray and radium departments. Nearly 96,000 out-patient visits were made last year. About one third ofthe work of the hospital is free.

Memorial Hospital was founded in 1884 by Mr. andMrs. John Jacob Astor and Elizabeth Hamilton Cul.lum.

RECENT DEATHS AND MEMORIALSDR. KARL PEARSON, emeritus professor of eugenics

and formerly director of the Francis Galton Labora-tory for National Eugenics at the University ofLondon, died on April 27. He was seventy-nine yearsold.

PROFESSOR IRVING ALLSTON PALMER, head of thedepartment of metallurgy of the Colorado School ofMines at Golden, died on April 29. He was seventyyears old.

DR. GEORGE ELLsWORTH DAWSON, director of thepsychological laboratory, Public Schools, Springfield,Massachusetts, died on April 21 at the age of seventy-four years.

WILLIAM B. VARNum, who reeently resigned as

MAY 8, 1936 429

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VOL. 83, No. 2158

astronomer at the Dudley Observatory, Albany, N. Y.,died on April 27, at the age of sixty-seven years.A BlLL has been offered by Edwin Miller in the New

York Senate that would authorize the state to add thehome of the late Dr. Charles Steinmetz, of the GeneralElectric Company, containing his workshop and ex-perimental laboratory, to its present park system.A STATUE erected in Danielsville by the state of

Georgia in honor of Dr. Crawford W. Long, as thefirst physician to use ether anesthesia, was unveiled onMarch 30. The legislature authorized the erection ofthe memorial at or near Dr. Long's birthplace. Mrs.0. A. Harper, daughter of Dr. Long, and E. C. Long,

Jr., assisted in the unveiling. Speakers included Gov-ernor Eugene Talmadge, Dr. Lamartine G. Hardman,Commerce, former governor; Dr. Jame,s E. Paullin,Atlanta, president of the state medical association,and Dr. Hugh H. Young, Baltimore.

THE Russian Government has decided to erect amonument to Pavlov in Leningrad and to name aninstitute after him, as well as to publish his worksin four languages. His brain will be kept in the Mos-cow Institute for Cerebral Research. His widow is toreceive a monthly pension of 1,000 roubles. A newasteroid discovered by the Simeiz Observatory in theCrimea has been named "Pavlodia."

SCIENTIFIC NOTES AND NEWSAT the annual meeting of the National Academy of

Sciences held in Washington from April 27 to 29 theAgassiz Medal for Oceanography was presented toDr. T. Wayland Vaughan, director of the Scripps In-stitution and professor of oceanography, the Univer-sity of California. The public welfare medal waspresented to Dr. F. F. Russell, lecturer on preventivemedicine and hygiene at the Harvard Medical School,distinguished for his work as director of the Interna-tional Health Division of the Rockefeller Foundation.The Agassiz Medal was presented by Dr. Henry B.Bigelow, of Harvard University, director of theOceanographic Institute at Woods Hole, Mass., andthe public welfare medal by Dr. Max Mason, recentlypresident of the Rockefeller Foundation.

MEMBERS of the National Academy of Sciences havebeen elected as follows: Dr. Leo Hendrik Baekeland,honorary professor of chemical engineering, ColumbiaUniversity; Dr. Eliot Blackwelder, professor of geol-ogy and head of the department, Stanford University;Dr. Ira Sprague Bowen, professor of physics, Cali-fornia Institute of Technology; Dr. Wallace HumeCarothers, research chemist, E. I. du Pont de Nemours,Wilmington, Del.; Dr. Alexander Forbes, associateprofessor of physiology, Harvard Medical School; Dr.William Francis Giauque, associate professor of chem-istry, University of California; Dr. Clark LeonardHull, professor of psychology, Yale University; Dr.Edwin Oakes Jordan, professor of bacteriology andchairman of the department, University of Chicago;Dr. Alfred Vincent Kidder, chairman of the divisionof historical research of the Carnegie Institution; Dr.Warren Harmon Lewis, professor of physiologicalanatomy, the Johns Hopkins University, and researchassociate of the Carnegie Institution; Dr. Robert San-derson Mulliken, professor of physics, the Universityof Chicago; Dr. William Cumming Rose, professor ofphysiological chemistry, University of Illinois; Dr.

Edmund Ware Sinnott, professor of botany, Colum-bia University; Dr. Joseph Leonard Walsh, associateprofessor of mathematics, Harvard University, andDr. Orville Wright, director of the Wright Aeronauti-cal Laboratory at Dayton, Ohio.

DR. EDWIN GRANT CONKLIN, who in 1933 becameprofessor emeritus of zoology at Princeton University,was at the recent meeting of the American Philosophi-cal Society reelected as one of the vice-presidents andwas made executive vice-president, a new office. Mrs.Caroline French Skinker, who for the past twelveyears has been executive secretary, will retire on June30. A minute was adopted expressing appreciationof her services.EDMUND NoRRIS GATHERCOAL, professor of pharma-

cognosy of the School of Pharmacy of the Universityof Illinois, Chicago, has been awarded the RemingtonHonor Medal for 1936 of the New York Branch of theAmerican Pharmaceutical Association "in recognitionof his service to pharmacy as chairman of the RevisionCommittee of the National Formulary VI, his work inpromoting higher standards for pharmaceutical prod-ucts, his efforts to bring about the standardization ofcolor nomenclature, his exhaustive study of prescrip-tion ingredients, his research in pharmacognosy andhis record of many years of faithful service as ateacher."

THE Trudeau Medal of the National TuberculosisAssociation has been awarded to Dr. Edward W.Archibald, professor of surgery at McGill Universityand consulting surgeon at the Royal Victoria Hos-pital.IN recognition of her forty years' service to New

York City Dr. Anna W. Williams, formerly assistantdirector of the research laboratories of the New YorkCity Department of Health, received on April 27 atestimonial scroll presented by the Women's Medical

430 SCIENCE

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VoL. 83, No. 2158

six-foot model was in use as part of the recent Ver-mont Conservation Commission's exhibit at the Sports-man's Show in Burlington and attracted a great dealof interest. The apparatus in this instance was usedto display specimens of insects which form an impor-tant part of the food of the brook trout. By the useof ten lenses of several sizes fifteen different formswere shown.

*r'sL buq0a

cD UH KFIG. 1. Schematic of apparatus for copying isolated

sounds from a phonograph record. A, shape of shield;B, projecting portion of shield; 0, playback turntable;D, 32 c.p. lamp; E, photoelectric relay; F, amplifier; G,cutting-head; H, switch; I, loud speaker; J, head-phones;K, cutter turntable; L, electric pick-up.

from this lamp falls upon the cell of the photoelectricrelay, E. The relay is put across one side of the lineconducting the output of the amplifier, F, to thecutting-head, G, and is adjusted to close the circuitwhen the cell is activated. A switch, H, also breaksthe circuit.

The original phonograph record is placed on topof the shields, played into the amplifier and heard inits entirety in the loud speaker, I, while the line fromthe relay to the cutter is tapped by a pair of head-phones, J. The shields are adjusted until the soundselected for recording is heard in the head-phones asone of the intermittent tones admitted by the relay.This selected portion is recorded in isolation by clos-ing the switch, H, during the interval which immedi-ately precedes the sound, and by opening it as soonas the sound has been cut.With the present apparatus sounds of duration less

than .39 sec. are recorded conveniently. Soundrs oflonger duration may be recorded with the same ar-rangement by decreasing the length of the projectingportion of the shields or by mounting the shields, relayand light upon a slower speed turntable than that usedfor playing the original record. In psychophysicalwork which does not demand the presentation ofstimuli in rapid succession, the device may be adaptedto any electric phonograph and used without recordingthe sounds.

GRANT FAIRBANKSSTATE UNIVERSITY OF IOWA

DEMONSTRATION APPARATUS FOR SMALLINSECTS

THE apparatus here described has proved useful forthe public exhibition of smail biological specimens. A

FIG. 1. Top and side views of demonstration apparatus.

The apparatus consists primarily of a box into theupper lid of which the lenses are fastened; the illumi-nation is furnished by fifteen-watt electric lamps whichcan be turned on by the observer by pushing a buttonmounted on the lid by the lens. Large objects, suchas adult insects, are illuminated with indirect light, anda reading glass lens of about a six-inch focal lengthis used to magnify them. Small objects, such aslarvae, which one would ordinarily examine under adissecting microscope, are mounted on a baffle boardclose to a dissecting. lens. Light passes up through asmall hole in the baffle board. It was found that bestresults were obtained when the opening on the lowerside of the board was covered by a piece of opal glasswhich helps to diffuse the light without cutting downits intensity too greatly. The push button control ofthe lights eliminates the danger of overheating andthe consequent destruction of balsam preparations.Descriptive labels placed beside the lenses help to con-vey the story to the layman observer.

WM. HUDSON BEENEYUNIVERSITY OF VERMONT

BOOKS RECEIVEDCROWTHER, J. G. Soviet Science. Pp. x + 342. 15 plates.

Dutton. $4.00.KELWAY, PHYLLIS. Hedge Folk in Twilight. (Field

mice, dormice, shrews, hedgehogs, owls). Pp. xi+178.21 plates. Longmans, Green. $2.50.

SOUTHWELI, R. V. An Introduction to the Theory ofElasticity; For Engineers and Physi<": Pm509. 120 figures. 3 P2~lles. Oxford University Press.$10.00.

SUTTON, 2CICHARD L. AND RICHARD L. SuTTON, JR. AnIV'qroduction to Dermatology. Second edition. Pp.xvi+566. 190 figures. Mosby. $5.00.

446 SCIENCB

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MAY 8, 1936 .WIENCE-ADVERTISEMENTS 9

Some Outstanding Textbooks inBIOLOGY

TEXTBOOK OF GENERAL ZOOLOGYBy WINTERTON C. CURTIS, Professor of Zoology, and MARY J. GUTHRIE,Associate Professor of Zoology, with the collaboration of KATHARINE R.JEFFERS, Research Associate in Zoology; all at the University of Missouri

"Curtis and Guthrie" continues to be one of the leading textbooks in the field, as shown by the fact that ninety-four colleges and universities have used it during the present school year. Teachers concur in the opinion thatthis book is "the best elementary text of its kind on the market."Second Edition 588 pages; 6 by 9; $3.75

Laboratory Directions in General ZoologyBy WINTERTON C. CURTIS, MARY J. GUTHRIE, and FARRIS H. WOODS,

Assistant Professor of Zoology at the University of MissouriSecond Edition 164 pages; 6 by 9; $1.50

AN INTRODUCTION TO THE VERTEBRATESBy LEVERETT A. ADAMS, Assistant Professor of Zoology, University of

IllinoisEighty-nine adoptions for the current year amply illustrate the favor in which this introductory textbook is held."Adams" is famous for its breadth of content, thoroughness and conciseness of presentation, and ease of style. Theteachability of the book is attested by the quickened interest of the students, by their progress in the work itself,and by the facility with which they enter upon subsequent work in advanced fields.

414 pages; 6 by 9; $3.50

INTRODUCTION TO VERTEBRATE EMBRYOLOGYBy WALDO SHUMWAY, Professor of Zoology, University of Illinois

This book long ago won the respect and admiration of teachers for its excellent qualities. Of the third editionthey say, "The generous use of the cytological material in the earls chapters, the illustrations of several types ofdevelopment, the introduction of much material from recent experiments from the- field of experimental embry-ology idapts the book for the liberal arts college. The section devoted to anatomy of the vertebrate embryos is adistinct contribution in itself."Third Edition 390 pages; 6 by 9; $4.00

AN INTRODUCTION TO HUMAN PARASITOLOGYBy ASA C. CHANDLER, Professor of Biology, The Rice Institute

This book is so well and favorably known that it hardly needs detailed comment. The recently published fifthedition, which incorporates the most up-to-date material in the subject, has been so enthusiastically received thatit bids fair to surpass its own previous popularity. Nearly one hundred different colleges and universities haveused this book in earlier editions.Fifth Edition 661 nazes: 6 bv 9: $5.00

Essentials of Human EmbryologyBy GCDEON S. DODDS, Professor of Histology andEmbryology, School of Medicine, West Virginia Uni-versity.316 pages 5j by 9 $4.00

Outline of Comparative EmbryologyBy AUTE RICHARDS, Professor of Zoology and Headof the Department, Director of Biological Survey, Uni-versity of Oklahoma.444 pages * 6 by 9 $5.00

0An Elementary Course in General PhysiologyBy G. W. SCARTH, MacDonald Professor of Botany,and F. E. LLOYD, MacDonald Professor of BotanyEmeritus; both at McGill University.258 pages 6 by 9 $2.75

Textbook of General BiologyBy WALDO SHUMWAY361 pages 6 by 9

0John Wiley & Sons, Inc., 440-4th Avenue, New York, N. Y.

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MAY 8, 1936 SCIENCE-ADVERTISEMENTS 9

Page 13: W ^d1-~~~W ^d1 cI lassachu! NEWSERIEs FI SUBSCRPTON, $6.00 VOL. 83, No. 2158 FRDAY, M 8 SINGLE COPIS,.15 NEW BLAKISTON BOOKS ¶ WARDLE-GeneralEntomology Anewcourse for students training

MAY 8, 1936 SCIENCE-ADVERTISEMENTS 11

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