TheOf PATH SCIENCE€¦ · FIRST-YEAR QUALITATIVE ANALYSIS by CarlJ. Likes andAubreyE. Harvey, Jr....

22
SCIENCE-ADVERTISEMENTS Scinc toays temans toayendevastatin/o consrctv 'smnma e dm I aIed is teconeroa $hekn mn £hD The PATH Of SCIENCE By C. E. KENNETH MEES, Vice-President in charge of Research, Eastman Kodak Company Science today is the means to any end, devastating or constructive as men may de- termine. Its use for good is the concern of all thinking men, to whom Dr. Mees directs this penetrating study of science and society. THE PATH OF SCIENCE tells the story of science in human history. It reviews the evolution of scientific thought and the various social factors influencing that evolution. It discusses specifically the development of the scientific method and the growth of physical, chemical, and biological ideas. In the concluding chapters, this background material is shown to be basic to an understanding of what science is today and can be tomorrow. The present-day status of science and the possibilities ahead are thoroughly analyzed in discussions of modern organization for scientific research, applications of science to industry, and the relation of science to society, including proposals for scientific study of sociology and politics. Dr. Mees and Dr. John R. Baker, who wrote the chapter -on "The Growth of Bio- logical Ideas, " are both active participants in the advance of science and technology. They have brought to their pages a rare combination of realism and perspective. THE PATH OF SCIENCE is a book of unusual value to the scientist and to the teacher who would see their task in the light of history. The broad scope of this unique book can be seen from the resume of the table of contents: The Interpretation of History. The Helix of History. The Method of Science. The Development of the.Scientific Method. The Growth of Physical Ideas. The Growth of Chemical Ideas. The Growth of Biological Ideas. The Production of Scientific Knowledge. Applied Science and Industrial Research. The Path of Science. Published in November 240 pages 55/8 by 8/8 $3.00 JOHN WILEY & SONS, Inc., 440-4th Ave., New York 16, N. Y. ..l 6 December 1946 19.

Transcript of TheOf PATH SCIENCE€¦ · FIRST-YEAR QUALITATIVE ANALYSIS by CarlJ. Likes andAubreyE. Harvey, Jr....

Page 1: TheOf PATH SCIENCE€¦ · FIRST-YEAR QUALITATIVE ANALYSIS by CarlJ. Likes andAubreyE. Harvey, Jr. 134 pp-1947 $1.25 INTRODUCTION TO QUANTITATIVE ANALYSIS bySaul B. Arenson andGeorge

SCIENCE-ADVERTISEMENTS

Scinc toaystemans toayendevastatin/oconsrctv 'smnma e

dmIaIed is teconeroa $hekn mn £hD

The PATHOf SCIENCEBy C. E. KENNETH MEES,Vice-President in charge of Research,

Eastman Kodak Company

Science today is the means to any end, devastating or constructive as men may de-termine. Its use for good is the concern of all thinking men, to whom Dr. Meesdirects this penetrating study of science and society.

THE PATH OF SCIENCE tells the story of science in human history. It reviewsthe evolution of scientific thought and the various social factors influencing thatevolution. It discusses specifically the development of the scientific method andthe growth of physical, chemical, and biological ideas.In the concluding chapters, this background material is shown to be basic to anunderstanding of what science is today and can be tomorrow. The present-daystatus of science and the possibilities ahead are thoroughly analyzed in discussionsof modern organization for scientific research, applications of science to industry,and the relation of science to society, including proposals for scientific study ofsociology and politics.Dr. Mees and Dr. John R. Baker, who wrote the chapter -on "The Growth of Bio-logical Ideas," are both active participants in the advance of science and technology.They have brought to their pages a rare combination of realism and perspective.THE PATH OF SCIENCE is a book of unusual value to the scientist and to theteacher who would see their task in the light of history.The broad scope of this unique book can be seen from the resume of the table ofcontents: The Interpretation of History. The Helix of History. The Method ofScience. The Development of the.Scientific Method. The Growth of Physical Ideas.The Growth of Chemical Ideas. The Growth of Biological Ideas. The Productionof Scientific Knowledge. Applied Science and Industrial Research. The Pathof Science.

Published in November 240 pages55/8 by 8/8 $3.00

JOHN WILEY & SONS, Inc., 440-4th Ave., New York 16, N. Y...l

6 December 1946 19.

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20 Vol. 104, No. 2710

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SCIENCE-ADVERTISEMENTS * Vol. 104, No. 2710

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6 December 1946

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28 SCIENCE-ADVERTISEMENTS Vol. 104, No. 2710

CHECK LIST OF IMPORTANT INTERSCIENCE BOOKS-

Prices valid as of December 1, 1946Advances in Colloid Science, Vol. 1-1942. $6.50.

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SCIENCE-ADVERTISEMENTS

for RADIOACTIVITY Measurements

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SCIENCE-ADVERTISEMENTS

Fiberglas Cloth Used ExperimentallyFor Postoperative Wound Dressings

Fiberglas materials have been shown to be uniquelysuited to certain medical uses through their experi-mental application by physicians, surgeons andothers engaged in medical research.The quest for an ideal packing material for post-

operative care of compound wounds, for example,was based upon a number of qualifications.

ESSENTIAL FACTORS

Such an improved dressing must allow proper drain-age and granulation of the wound so that an earlysplit-skin graft can be applied if desired. It shouldbe non-irritating to the skin and should not act asa foreign body if left embedded in human tissues.It should prevent adherence of granulations andprevent exuberant granulation. It should not causepain or excessive bleeding on removal, and shouldbe simple to prepare and use.

United States Army Signal Corps Photo.Shoulder wound, three weeks after saucerization ofthe cavity. (a) Fiberglas Cloth may be seen on thewound surfaces. (b) No granulations are growingthrough the meshes.

After consideration of these factors, FiberglasCloth was tried experimentally at the Percy JonesGeneral Hospital, Battle Creek, Mich., in thirty-five cases where ordinarily petrolatum-impregnatedgauze would have been used.

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In applying the dressing at the time of surgery, asquare of glass cloth is cut large enough to coverall surfaces of the wound and to project over theskin margin. The center of the invaginated glasscloth should be packed with dry cotton gauze tohold open the edges of the wound and to act as awick to remove exudate. A pressure bandage orpadded cast, as indicated, is placed over such adressing.

These Fiberglas dressings were left in the woundfor varying periods of time. The report in theJournal of Bone and Joint Surgery* says, "contra-

United States Armny Signal Corps Photo.The same wound (a) after removal of FiberglasCloth, showing clean granulations and no bleedingor thick exudate.

indications have not been observed". FiberglasCloth was also tried as the first layer of a wet dressingfor a split-skin graft. By such experimentation, theuses of Fiberglas in medicine are being established.

Fiberglas is the trade name of a variety of prod-ucts made of glass fibers. Glass textile fibers, madein diameters from two to four ten-thousandths of aninch are formed into yarns which are woven into awide variety of textiles.

Fiberglas is an inorganic, non-toxic, non-allergenic,non-sensitizing and chemically-stable material thatproduces no harmful effect upon human tissue. Thesefine fibers are pliable and possess great tensilestrength. They have dimensional stability, are un-affected by temperature extremes, corrosive fumesand most acids. They are non-hygroscopic and non-combustible, and may be easily sterilized and re-sterilized. In a special glass formula, they areradiopaque.*Vol. 28, No. 1, pp. 180-181,January, 1946.

Some Other Uses of Fiberglasin Medicine

For some time, it has been the policyof Owens-Corning Fiberglas Corpora-tion to supply samples of Fiberglasin any available form to qualified per-sons engaged in research. Write Owens-Corning Fiberglas Corporation, 2033Nicholas Bldg., Toledo 1, Ohio.

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SCIENCE-ADVERTISBMENTS

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SCIENCE-ADVERTISEMENTS

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Page 16: TheOf PATH SCIENCE€¦ · FIRST-YEAR QUALITATIVE ANALYSIS by CarlJ. Likes andAubreyE. Harvey, Jr. 134 pp-1947 $1.25 INTRODUCTION TO QUANTITATIVE ANALYSIS bySaul B. Arenson andGeorge

SCIENCE-ADVERTISEMENTS Vol. 104, No. 2710

Personnel Placement

POSITIONS OPEN

Positions Open-(a) l1harmmmacologist to head division of

pharmacology, rapidly growing research linlloratories of one

of important companies in pharmaceutical industry; ample

opportunity for research; possibility of teaching post in

university medical school; administrative ability required;$10,000. (b) Bacteriologist to head department of bac-

teriology control; duties include all sterility testing, germi-

cidal testing, safety testing in manufacturing of biologic.lls;experience ill biologicals and administration desirable; $5,000.(c) Assistant professor of biocheiiistry; young man, com-

petent teacher, required; $4,600. (d) Assistant professor,department of bacteriology, uiiiversity medical school; duties

include teaching imniunology and some general bacteriology,research; $3,700. (e) Biophysicist wvith knowledge of physi-

ology and higher mathematics and preferably experienced in

optics and radiation and, also, biochenmist with interest inphysiological problems and aptitude for new analyticalmethods; laboratories specializing in research in environ-

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pre-medical students; January first; West. (g) Physiolo-

gist; university school of medicine; advamitageous if qualified

in neuro-physiology; excellent opportunity for teaching and

research. (h) Instructor or assistant professor in botany;duties consist of teaching general botany and one or two

advanced courses such as ecology, range and pasture botanyor plant pathology; relatively young man with Ph.D. in

botany preferred; candidate with Master's degree elegible;state agricultural college. S11-4, The Medical Bureau

(BURNEICE LARSON, Director), Palmolive Building, Chi-cago 11.Research Chemist. Wanted for research department of largeeastern public utility company. P'h.D. or D.Eng. in chem-istry or chemical engineering, or equivalent research experi-ence. Qualifications in physical chemistry and thermody-namics desirable. Replies will be treated confidentially.Give full information, including salary desired. Representa-tive will lIe in attendance at Boston meeting. Arrange inter-view through Box 673, SciFENCF..Wanted-Young physicist, Ph.D. preferred to specialize inacoustical and electromagnetic research and design in Chi-cago. Box 6i37, SCIENCE.Positions open for physicists to be responsible for develop-ment of general specifications and basic functional design of

groups of optical irstrunients; and position open for engineerto develop detailed specifications of instruments for manu-

facture. Write Personnel Director, AMiERICAN OPTICAL CO.,Buffalo 15, N. Y. Representative at Boston Meetings A.A.A.S.Exhibition Booth #26 at Armory.Biochemist for research and sales development work both inlaboratory and in field. P'h.D. essential. Experience shouldinclude industrial work in more than one of the followingfields: agriculture, sanitation, water treatment, insecticides,fungicides, bacteriology. The man for this position maynow be in teaching or civil service. Detail personal data,education, experience, publications; state salary expected, inreply. Boxy 684, SCIENCE.Physicist-Good theoretical background particularly in

mathematical physics and its application to electronics.Experience in radar and communications desired but notessential. Extremely pleasant working environment. West-chester County, one hour commuting from New York City.Box 680. SCIENCE.Graduate Assistantships in zoology and related fields. Sev-eral appointments available, second semester (January).Stipend $500 per semester for half-time teaching or researchand half-time graduate study. Reply to: ROBERT GAUNT,Department of Zoology, Syracuse University, Syracuse, NewYork.

POSITIONS OPEN

Research chemist. Position available with national organi-zation for research chemist in amino field. Experience neces-sary in ion exchange resins and physical chemist preferred.Must be able to lead project. Midwest location. Replygiving education experience, age, salary desired. 'Box 693,SCIENCE.

Instructor in biology in catholic college in south. Will beattending Boston meeting. Arrange interview through Box683, SCIENCE.

Electrical Engineer-Good theoretical background in mediuman(l high frequency circuits design and analysis. Must havepotentialities for original work in research and development.Extremely pleasant working environment. WestchesterCounty, one hour commuting from New York City. Box

681, SCIENCE.

Mycologist-With knowledge of bacteriology and organicchemistry. Administrative experience essential. Give com-plete details. Extremely pleasant working environment.Westchester County, one hour commuting from New YorkCity. llox 682, SCIENCE.

Physical chemist. Recent Ph.D. with good theoretical back-ground in colloid chemistry wanted for institutional researchin surface phenomena. Excellent working conditions. East-ern location. Please give detailed qualifications, salary re-

(uired, references, and date of availability in first letter.Box 686, SCIENCE.

Biologist special experience in oyster work. Full time re-search. Complete Civil Service protection. Gulf state. Box672. SCIENCE.

Physiologist and Zoologist-Rank and salary based on quali-fications, southern state. Will be attending Boston meetings.Arrange interview through Box 667, SCIENCE.

Organic Chemists for pigment and dyestuff research. Ex-

perience in this field desirable but not necessary. Locationnear New York. Ample opportunity for advancement. Sendsnapshot with details of training and experience. Box 655,SCIENCE.

Research Physicist. Wanted for research department of

large eastern public utility company. Ph.D. or D.Eng. in

physics or electrical engineering, or equivalent research ex-

perience. Should have experience in X-ray diffraction andother physical methods of identification or background for

development in this field. Replies will be treated confi-

dentially. Give full information, including salary desired.

Representative will be in attendance at Boston meeting.Arrange interview through Box 674, SCIENCE.

POSITIONS WANTED

The California Medical Bureau, Agency for scientific and laypersonnel in medicine, biology, chemistry, physics, and allied

sciences, supplies teachers, research workers, laboratorydieners, skilled office help. Prompt service. Registrationfree. Your patronage respectfully solicited. THE CALI-

FORNIA MEIJCAL BUREAU, Agency, Arcade Medical Center,Colorado Street, Pasadena 1, California.

Woman chemist; B.A. with some graduate work desires posi-tion as administrative assistant, personnel assistant or pro-duction supervisor with pharmaceutical or chemical company.12 years administrative experience including employee selec-

tion, job analyses, on the job training, and report writing.Available after January 1. East preferred. Box 678,SCIENCE.

Biologist; Ph.D.-51/2 years post-doctorate research in ex-

perimental cancer, 31/2 years as aviation physiologist. De-

sires part teaching, part research privileges in departmentof zoology or in department of anatomy or physiology of

medical school. Possibility of continuing grants for ex-

perimental work. Minimum salary $4,500. Will be attend-

ing Boston meeting. Arrange interview through Box 689,SCIENCE.

Genetics, Cytology, Botany. Man, Ph.D. Fifteen years

postdoctorate teaching, research, and chairmanship experi-ence. Now employed. Publications. Desires position In

botanical garden, university, or other institution where re-

search is stressed. Minimum associate professor. No geo-graphical restrictions. Will be attending Boston meeting.

Arrange interview through Box 664, SCIENCE.

34

CHARGES FOR CLASSIFIED ADVERTISING

Regular setting 10¢ a word. Minimum charge $2.00for each insertion. A box number counts as 8 wordsof the advertisement (e.g. 20 words plus box numberequals 28 words). Make checks payable to the A.A.A.S.All insertions must be acconipanied by correct remit-tance and sent to the Adv. Dept. A.A.A.S. Pleaseaddress replies as follows: Box number, SCIENCE,1515 Mass. Ave., N. W., Wash. 5, D. C.

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SCIENCE-ADVERTISEMENTS

Personnel PlaementPOSITIONS WANTED

Physicians, Laboratory and X-Ray Technicians, Bacteriolo-gists, Pharmacists, Physical Therapists let us help yousecure a position. Our service, established 1896, is Nation-wide. Write us today. All information confidential.AZNOE'S WOODWARD BUREAU, 30 North Michigan, Chicago 2.

Parasitologist-Zoologist, Ph.D. Experience eighteen yearsteaching and research. Desires similar position or teachingpremedical subjects. Publications. Will be attending Bos-ton meetings. Arrange interview through Box 645, SCIENCE.

Zoologist, Ph.). Sixteen years successful teaching, researchand administrative work. Publications, national societies,graduate students. Desires professorship with broader op-portunities. Will be attending Boston meeting. Arrangeinterview through Box 65, SCIENCE.

Plant physiologist-biochemist, Ph.D., excellent training, re-search and teaching experience; publications; veteran. Willbe attending Iloston meeting. Arrange interview throughBox 679, SCIENCE.

SocIologIst-Anthropologist, at present assistant professor Inmajor Institution; three years' research fellowship, fieldwork; publications: two years' successful teaching; severalyears' graduate study abroad; three major, two. minor lan-guages; b)achelor, 41. Minimum: $4,000, Institution withlarge library. Will be attending Boston meeting. ArrangeInterview through Box 654, SCIENCE.

Zoologist, Ph.D., Embryology, Endocrinology. Minors:Botany, Biochemistry. Age 34. Teaching, research experi-ence. Veteran. Desires change of teaching position. Avalil-able September. Will attend Boston meeting. ArrangeInterview through Box 649, SCIENCE.

Zoologist Ph.D. Department head In state college nine yearsseeks similalr post in small university or large state collece.Numerous publications on physiology of protozoa. Box 659,SCIENCE.

Zoologist, minor enltomology; work equivalent to minor Inanatomy, Ph.D. in June, five years teac.hing experience instate university: desires teaching position in college, uni-versity or medical school. Will be attending Boston meet-ing. Arrange interview through Box 691, SCIENCE.

Zoologist, major endocrinology, minor physiology, Ph.D. InJune, four years research experience in state university lab-oratory, teaching experience also; desires research or teach-ing position. Will l)e attending Boston meeting. ArrangeInterview through Box 69. SCIENCE.

Botanist, Ph.D. (Plynt Physiology). Associate professor,twelve years successful experience, publications, Sigma Xi.Will be attending Boston meeting. Arrange. Interviewthrough Box 676, SCIENCE.

Positions Wanted-Young man is available for position Inzoology or biology; B.S. (major, Biology; minors, Chem-istry, Psychology-Philosophy, Government); M.A., P'h.D.(Zoology); ten years' experience In teaching zoology andbiology; noav assistant professor In university school ofmedicine; although experienced in teaching anatomy, pre-fers biology and zoology; available at close of semester; forfurther information, please write BURNEICE LARSON, l irector,The Medical Bureau, Palmolive Building, Chicago 11.

Botanist-cytologist, Ph.D., ten years of research, seekschange beginning September 1947, desiring to teach generalbotany, comparative anatomy, cytology, with some time forresearch. Box 642, SCIENCE.

M.1)., Ph.D., organic chemistry major, biochemistry minor.Desires permanent research position. Veteran under 30.Box 675, SCIENCE.

Zoologlst-Physlologist, age thirty-eight, B.S., M.S., furtherstudy, decade research experience, wishes teaching researchposition. Will be attending Boston meeting. Arrange in-terview through Box M58, SCIENCE.

35

Personnel PlacementPOSITIONS WANTED

Physiologist, Ph.D., five years experience medical schoolteaching and research. Publications. Desires teaching andresearch position in mammalian physiology. Box 657,SCIENCE.

Biologist with administrative experience; Ph.D., desires po-sition as college dean of arts and sciences or with similarresponsililities. Will lie attending Boston meeting. Ar-range interview through Box 661, SCIENCE.

Physiologist, Ph.D. 1936, age 37, desires teaching-researchposition in medical school. Major interest respiration, cir-culation and renal physiology. Box 688, SCIENCE.

Botanist, woman, Ph.D., Cornell, desires position teachingan.tonmy and morphology. Fives years teaching experiencein leading womian's college. Research interests, publication.Will lie attending Boston meeting. Arrange interviewthrough Box 677, SCIENCE.

Economic Geologist and Curator of Minerals. Experience inniuseummis, geological exploration, mining geology. Presentposition, head of geological lalioratory of prominent federalagency. Family. Positions abroad will be considered. Box692. SCIENCE.

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The Market Place

BOOKSCHARGES FOR CLASSIFIED ADVERTISING Wanted to purchase-Scientific Periodicals, sets and runs,

Foreign-Domestic. Entire libraries and smaller collections.Regular setting 10¢ a word. Minimum charge $2.00 WALTER S. JOHNSON. 125 East 23rd Street, New York 10.for each insertion. A box number counts as words Journals, Periodicals- sets and runs. Also whole collectionsof the advertisement (e.g. 20 words plus box number purchased for cash. J. S. CANNER & COMPANY, 909 Boylstonequals 28 words). Make checks payable to the A.A.A.S. Street, Boston 15. Massachusetts.All insertions must be accompanied by correct remit-tance and sent to the Adv. Dept. A.A.A.S. Please LABORATORY ANIMALSaddress replies as follows: Box number, SCIENCE, Laboratory Animals-Guinea pigs, rabiits, white mice. Can1515 Mass. Ave., N. W., Wash. 5, D. C. be shipped 1000 miles and more with good satisfaction.

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Page 19: TheOf PATH SCIENCE€¦ · FIRST-YEAR QUALITATIVE ANALYSIS by CarlJ. Likes andAubreyE. Harvey, Jr. 134 pp-1947 $1.25 INTRODUCTION TO QUANTITATIVE ANALYSIS bySaul B. Arenson andGeorge

6 December 1946 SCIENCE-ADVERTISEMENTS

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follows:

*TRANSMISSION BAND

Wave Length as specified between 3700 A' and 7000 A' (tolerance

50 A

Width 100.150 A' (half maximum transmission).

Transmission 25.35%o maximum falling off rapidly to approximately

1/2% minimum.

*SIZE 2" square

PRICE Filters in the region between 3700 A' and 6000 A' $12.50 each.

Filters in the region between 6000 A' and 7000 A' $14.00 each.

DELIVERY Limited number from stock. (Delivery estimate for filters in quantity

available on request.) Send orders directly to Baird Associates. Specify

wave length in Angstrom Units when ordering.

Manufactured by Evaporated Metal Films Corporation for:

Baird ssociates

33 University oa, ambridge j8, JCassachusetts

HEREDITY AND VARIATIONIN MICROORGANISMS

COLD SPRING% HARBOR SYMPOSIAON QUANTITATIVE BIOLOGY

Volume XI (1946), about 300 quarto pages,16 halftone plates, and 88 figures.

Problems of heredity in viruses, bacteria, fungi, andprotozoa are considered in 27 papers written by: T. F.Anderson; D). Bonner; M. I. Bunting; M. Delbruckland W. T. Bailey, Jr.; M. Demerec and R. Latarjet;L. Dienes; R. J. Dubos; A. D. Hershey; A. Hollaenderand C. W. Emmons; T. Johnson; J. G. Kidd; J. Led-erberg and E. L. Tatum; C. C. Lindegren and G.Lindegren; S. E. Luria; A. Lwoff; E. C. MacDowell;M. McCarty, H. E. Taylor, and 0. T. Avery; N. W.Pirne; G. Pontecorvo; M. M. Rhoades; 0. W. Rich-ards; F. J. Ryan; A. Shapiro; T. M. Sonneborn; S.Spiegelman; E. L. Tatum; and C. B. van Niel.

Price: $6.00 plus postage (domestic, 25¢; foreign,50¢). Prepublication orders received before February1, 1947 will be sent postpaid. Table of contents senton request.

Previous volumes: I (1933), Surface Phenomena; II(1934), Growth; III (1935), Photochemical Reactions;IV (1936), Excitations; V (1937), Internal Secretions;VI (1938), Protein Chemistry; VII (1939), BiologicalOxidations; VIII (1940), Permeability and the Natureof Cell Membranes; IX (1941), Genes and Chromo-somes; X (1942), The Relation of Hormones to De-velopment. Price: $4.50, plus postage as above.Volumes I, V, and VI out of print.

Address Biological Laboratory,Cold Spring Harbor, New York.

a

Page 20: TheOf PATH SCIENCE€¦ · FIRST-YEAR QUALITATIVE ANALYSIS by CarlJ. Likes andAubreyE. Harvey, Jr. 134 pp-1947 $1.25 INTRODUCTION TO QUANTITATIVE ANALYSIS bySaul B. Arenson andGeorge

38 SCIENCE-ADVERTISEMENTS Vol. 104, No. 2710

JOr4e/ej era/ed'4n/nINTERNATIONAL MODEL PRAi

The latest development in Refrigerated Centrifuges, the InternationalModel PR-i offers the laboratory analyst practically all of the advan*Ktages of the larger. permanent type installations plus portability. Cen.trifuge and compressor are combined in one attractive cabinet mounted "-on casters, and both units are operated from a single cord and plugwhich can be connected to the ordinary lighting circuit.Constant temperatures plus or minus 20 can be maintained, and usa-ble accessories illustrated here include the multispeed attachment andhigh-speed heads for six 7 ml. tubes or four 25 ml. tubes at 18,000R.P.M., conical angle heads for 15, 50 and 100 ml. tubes at speeds *up to 5,000 R.P.M., the four-place pin type head for 250 mil. bottles; at2,600 R.P.M., as well as the conventional horizontal tube carryingheads. The compressor is of ample capacity to cool the interior of theguard bowl to 320 F. or lower with any of this equipment operating atmaximum speed and a room temperature of 800 F. *

Although not previously announced, the Model PR-1 has already beensupplied to Army, Navy and civilian laboratories, and has been suc- .cessfully used in research on the chemistry of the influenza bacillus.The features of the machine will at once suggest countless applications, *and complete details will gladly be furnished on request.Width 28" Length 44" Height 42" Weight 850 lbs.

INTERNATIONAL EQUIPMENT COMPANY *BOSTON 3 5, MASSAClHUSETTS

Page 21: TheOf PATH SCIENCE€¦ · FIRST-YEAR QUALITATIVE ANALYSIS by CarlJ. Likes andAubreyE. Harvey, Jr. 134 pp-1947 $1.25 INTRODUCTION TO QUANTITATIVE ANALYSIS bySaul B. Arenson andGeorge

Kodak develops special emulsions torecord individual corpuscular tracksFor ready identification of nuclear re-

actions, Kodak research provides fine grainAlpha Particle Plates and Film to recordalpha particles, deuterons, and protons as

individual tracks rather than over-all ex-

posure density.These emulsions, 25 microns thick, reveal

particle paths as close-spaced grains ... withfew gaps ... low background fog. They are

relatively insensitive to light and gammaradiation. To accentuate deuteron and pro-

ton sensitivity, boron can be introducedinto the emulsion either in manufacture or

by pre-exposure bathing. Kodak can supplythese plates and films in- any size to meetindividual convenience.Kodak invites you to write for more in-

Nuclear particle recordinsanother important function of photograp

formation about the specialized propertiesthat emulsion research can build into photo-graphic materials for nucleonics.

EASTMAN KODAK COMPANYRochester 4, N. Y.

Visit the Kodak exhibit at the BostonA.A.A.S. meeting . . . booth A50-51

How to process Kodak fine grainAlpha Particle Plates

Develop 2 minutes in Kodak Devel-oper D-19 at 680 F, without agitation.Rinse thoroughly in running wateror in Kodak Stop Bath SB-3.Fix in Kodak Fixing Bath F-5 fortwice the time to clear.

* Wash 30 minutes in running water.Note: Use Wratten Series I safelight.

Page 22: TheOf PATH SCIENCE€¦ · FIRST-YEAR QUALITATIVE ANALYSIS by CarlJ. Likes andAubreyE. Harvey, Jr. 134 pp-1947 $1.25 INTRODUCTION TO QUANTITATIVE ANALYSIS bySaul B. Arenson andGeorge

Dark-colored corpuscles, brilliantlines, and the subdued background ofthe Spencer Bright-Line Haemacyto-meter provide a strong contrast thatmakes cells easy to see and thereforeeasy to count accurately.Only the Bright-Line counting

chamber has a semi-transparent coat-ing of metal to eliminate glare-, in-

crease visibility of the lines, and causecells to be more evenly distributed.An instructive booklet on the use

of the Haemacytometer is enclosedwith each chamber.' If you do nothave a copy, write dept. M1 for one.

American w OpticalCON PANY

Scientific Instrument DivisionBuffalo 15, New York