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Volume 15 1940

STAIN TECHNOLOGYA JOURNAL FOR MICROTECHNIC

QUARTERLY

CONTENTSORIGINAL ARTICLES

Microscopic TechnicNature and Uses of Biological StainsNew Staining Methods

LABORATORY HINTS FROM THELITERATURE

Published by

BIOTECH PUBLICATIONSBox 299, Geneva, N. Y.

.1

2 SCIENCE-ADVERTISEMENTS VOL. 90, NO. 2346

DEEME 15 99SINEA VRIE ET

FREENEW Bulletin of

CASTLE

Bactenrological ApparatusA new and important bulletin of Castle Ap-paratus for the Bacteriological Laboratory isnow ready for distribution. WRITE TO-DAY FOR YOUR COPY.This new bulletin, fully illustrated, lists thelatest Castle laboratory apparatus includingAutoclaves, -single and double wall types,laboratory sterilizers, precision incubators, par-affin embedding ovens, Arnold steam steriliz-ers, serological water baths and Hot-air steriliz-ers. Bring your file up-to-date by asking foryour copy now, and mentioning the apparatuson which you want more detailed information.

WILMOT CASTLE COMPANY1212 University Avenue Rochester, N. Y.

IN SELECTING YOUR NEW CENTRIFUGE CONSIDER:0 Its quality of material and workmanship. 0 Actual capacities at higherspeeds. 0 Motor strength for continuous duty. * Its adaptability to widerange of accessory equipment. * The manufacturer's policy in design of newequipment to fit older models. * Future requirements of your laboratory.

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NEW SPEED MEASURING DEVICEA new Indicating Tachometer, especially designed for Inter-national Centrifuges, is now built into the Size 2 and TypeSB Centrifuges. It gives at a glance the running speed ofthe machine at any setting on the rheostat.The new tachometer can be attached to any Size 1 (Type Cor Type SB) or Size 2 Centrifuge now in service.

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DicCEMBM 15, 1939 SCIENCE-ADVERTISEMENTS 3-

VOL. 90, No. 23464 SCIENCE-ADVERTISEMENTS

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Actual mean length markedon each cell to nearest0.001 mm.

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SCIENCE-ADVERTISEMENTS4

DECEMBER 15 1939 SCIENCE-ADVERTISEMENTS 5

"The Ajax-Northrup high frequency induction furnace purchased five years

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ISCIENCE-ADVERTISEMENTS VOL. 90, NO. 23466

VOL. 90, No. 2346

We have used many different cloths in preparingthese cards. If no attention is paid to the expense,a most excellent material is tracing cloth. However,we have found equally suitable and much cheaperordinary book-binding fabrics. Another inexpensivematerial which we have used successfully is oiled silk.We have noted no injury to our films as a result of theuse of the latter material. Any cloth which does notravel along its cut edges and presents a smooth, non-scratching surface can be used. In sewing the cloth tothe board, care must be taken that it is not pulledtight across the board but rather caused to cup slightlybetween rows of stitching to provide space for the in-sertion of the film strips. This may be accomplishedby putting a small piece of cardboard, slightly greaterin thickness than the film strips, underneath all thepieces of cloth when sewing the material to the card-board. In order to have pockets accommodating 16pages, the seams are run lengthwise of the card. Insome cases, it is convenient to prepare cards to holdshorter strips, running the seams crosswise. It is alsoadvantageous to indent each successive cloth layer onequarter of an inch further from the right-hand edgeof the card than the cloth layer immediately beneathit. This affords easy access to the various pockets ina given row and reduces the number of pages whichcan be stored in the top pocket of a three-pocket cardby only one page. Each pocket is 40 millimeters wide,thus giving ample clearance for the 35-millimeter film.

In filing the ifim, it is convenient to record the identi-fying data concerning the film and the source of thematerial which has been copied on a strip of gummedpaper which can be pasted onto the cloth surface.There is ample room on the top surface of each rowof pockets to record full information concerning eachof the three films ified in the three pockets beneath.The films themselves may be given identifying numbersor notches on the leader of the film indicating pocketand card numbers, readily facilitating the return ofthe film to the card and pocket in which it belongs.The use of such a system of cards makes possible the

assembling of material pertaining to a given topicfrom widely divergent sources. On the other hand,we have used the cards as a means of assembling copiesof several items from the same volume of a journal.The system is quite flexible and, as peculiar needs forvariation in the filing scheme arise, can readily be ad-justed to meet the immediate needs. For libraries, theissuance of an entire film card to the patrons can atleast partially combat the drawback of the inabilityto scan shelf titles in a library of film, since the scan-ning of related titles on the card may serve to suggestfurther readings of interest.

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bound magazines in short strip lengths rather than inlong reels. An advantage which we have found in thisprocedure is that, particularly in the case of referenceworks, it is more convenient to examine a short striplength containing the desired page rather than goingthrough the majority of a 50- or 100-page reel to ob-tain a desired page reference. One other advantage ofthis scheme is that more than one person may makeuse of a book at the same time, provided that they wishto consult different pages. It is particularly con-venient to file indices in this fashion.The majority of books which are copied on microffim

do not exceed 550 pages. It will be noted that it ispossible to file such a book on two cards prepared asdescribed above to hold 288 pages each. However, if18 pockets are prepared on each side of the cardboard,the entire book may be filed on one card. Probablymost material on ifim lengths of 25 feet or more canbest be filed in roll form. But it has been our experi-ence in acquiring research material on microfilm dur-ing the last five years that a large majority of the itemswhich we have required in connection with chemicalresearch have been articles of 16 pages or less. Fre-quently the items do not exceed five pages.We have found that this method of filing enables

us to put a maximum number of ifims into a givenspace when short film lengths are involved. Thus it ispossible to ifie, in a 28-inch ffling drawer, 65,000 pagesof material. If cloth is sewn on both sides of the card-board and if more numerous pockets seem advisable,this number may be increased. Certainly such a sys-tem of filing makes possible the assembling of the re-search material required by individuals and small in-dustrial research laboratories in an ordinary 4-drawerfiling case.A catalogue notation on 3 x 5-inch filing cards re-

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UNIVERSITY OF KANSAS CITY

JENSEN-SALSBERY LABORATORY

HAROLD P. BROWN

JAMEES A. AuSTIN

BOOKS RECEIVEDBENNETT, H., Editor. T'he Chemical Formulary. Vol.

IV. Pp. 638. Chemical Publishing Co. of N. Y. $6.00.National Resources Committee. Consumer Expenditures

in the United States; Estimates for 1935-46. Pp. iii +195. Illustrated. Superintendent of Documents, Wash-ington. $0.50.

SEDGWICK, W. T. and H. W. TYLER. A Short Historyof Science. Revised by H. W. TYLER and R. P. BIGE-LOW. Pp. xxi + 512. 61 figures. Macmillan. $3.75.

SOKOLNIKOFF, IVAN S. Advanced Calculus. Pp. v + 446.McGraw-Hill. $4.00.

574 SCIENCE

DEEBa1,13 CEC-A ETI MNT 7

OFF PRESS DECEMBER 20th!

1939 INDEX

TO AUTHORS' ABSTRACTSin

* ANATOMY * ANTHROPOLOGY * MORPHOLOGY*NEUROLOGY * NUTRITION * PHYSIOLOGY

ZOOLOGY-for all papers published in

Journals ofThe Wistar Institute of Anatomy and Biology

January to December 1939

This year's subscribers to the Advance Abstract Card Service receive this Index free.

Available to non-subscribers-price fifty cents per copy.

Edition Limited! Order Now!THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY

Woodland Avenue and Thirty-sixth StreetPhiladelphia, Pa.

s~NV IN sR(Bogen) Studies on the History and Philosophy of

A useful indicator solution, Science and on the History of Learningand Culture

for determining the approxi- Series of supplementary volumes to.Isismate hydrogen ion concentra-tion of solutions. The color Edited by GEORGE SARTON,changes are as follows: D.Sc.

Red-About Ph 2.0 Six volumes have already appeared. Sub-Orange-About Ph 4.0 scription to vol. 7 (1939) is open. The edition

-,., Yellow-About Ph 6.0 is limited and relatively small. Libraries wish-Yellowish-Green-About Ph 7.0 ing to secure a copy should send their subscrip-

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>>>0-<<dPrices: Library 189, Cambridge, Mass.

~~~~Theprice is $5 per volume of the average

4oz

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|0 size of Isis volumes (except vol. costing $6).

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F.O.B..Norwood,OhioThe vols. of Osiris will contain, in general,-F.O.B. Norwood, Ohio series of articles devoted to a single subject,

Catalogue of Laboratory Reagents Upon Requestand also longer memoirs. It is proposed to- Cataloguef Laborator Reagents Uon Request i'hlishb ann vnliims . -vP.Q.r- nr P.yPnr+n.tinnna11- t.wn

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Isis will continue to be a quarterly journalcontaining shorter articles, reviews, notes andcorrespondence and critical bibliographies. Theremoval of the longer artieles to Osiris will in-crease the variety and attractiveness of Isis.

DECEMBIZF. 15, 1939 SCIENCE-ADVERTISEMENTS 7