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Valuable Reference
Working with* TOXIC CHEMICALS* RADIOACTIVE MATERIALS* CONTAMINANTS* MIRACLE METALS
This new book is a comprehensivereference on safety enclosures forhandling a wide variety of hazard-ous substances. Profusely illus-trated, it contains detailed de-scriptions of regular and vacuumdry boxes, biological safety cab-inets, fume hoods, pressurizedenclosures, control led-atmosphereboxes, waste containers, laboratoryfurniture and sinks, process units*and unitized dry box systems.You'll find an enclosure to meetalmost any contamination orsafety problem. Send for yourcopy now.
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NEW BOOKS
(Continued from page 148)
Advances in Nuclear Science and Tech-nology. vol. 2. Ernest J. Henley andHerbert Kouts, Eds. Academic Press,New York, 1964. 388 pp. Illus. $14. Sixpapers: "Reactor transfer functions," Ce-sar Sastre; "Heat exchangers in nuclearpower plants," George T. Lewis, Jr.,Michael Zizza, and Paul DeRienzo; "Theformation of free radicals in polymers byradiation, their reactions and reactivi-ties," M. G. Ormerod; "Measurementsof reactor parameters in subcritical andcritical assemblies," Irving Kaplan; "Scat-tering of thermal neutrons from solidsand their thermalization near equilib-rium," L. S. Kothari and V. P. Duggal,and "Some aspects of the use of digitalcomputers in nuclear reactor design,"Bernard W. Roos and Ward C. Sangren.
Advances in Structure Research byDiffraction Methods. vol. 1. R. Brill, Ed.Vieweg, Braunschweig, Germany; Inter-science (Wiley), New York, 1964. 227pp. Illus. $13.50. Six papers: "The deter-mination of crystal structures by neutron-diffraction measurements," G. E. Bacon;"Fourier synthesis of potential in electrondiffraction structure analysis and its appli-cations to the study of hydrogen atoms,"B. K. Vainshtein; "The determination ofphase angles," J. Karle; "Die thermischeUntergrundstreuung und ihre Anwendungzur Strukturuntersuchung von Molekulenin Kristallen," W. Hoppe; "AllgemeineGesichtspunkte fur die Deutung diffuserInterferenzen von fehlgeordneten Kris-tallen," H. Jagodzinski, and "Antisym-metry, colour symmetry and degeneratesymmetry," A. Niggli.
Alicyclic Compounds. Douglas Lloyd.Elsevier, New York, 1964. 181 pp. Illus.$6.50. A textbook aimed at the "honoursundergraduate student or the non-special-ist postgraduate."
Analysis in Function Space. Proceed-ings of a conference (Dedham, Mass.),June 1963. William Ted Martin and Irv-ing Segal, Eds. M.I.T. Press, Cambridge,Mass., 1964. 224 pp. Illus $6.
Analytical Chemistry of Niobium andTantalum. Ross W. Moshier. Pergamon,London; Macmillan, New York, 1964.284 pp. Illus. $12.75.
Applied Physics. Herman W. Pollack.Prentice-Hall, Englewood Cliffs, N.J.,1964. 784 pp. Illus. $13.25.Chemistry: A Physical Approach. Wil-
liam F. Sheehan. Allyn and Bacon, Bos-ton, 1964. 615 pp. Illus. $8.75.
Chemistry and Technology of Explo-sives. vol. 1. Tadeusz Urbanski. Trans-lated from the Polish edition by IrenaJqczalikowa and Sylvia Laverton. Perga-mon, London; Macmillan, New York,1964. 651 pp. Illus. $15.Chemistry in Premixed Flames. C. P.
Fenimore. Pergamon, London; Macmil-lan, New York, 1964. 129 pp. Illus. $5.
Chimica Generale e Inorganica. Giu-seppe Bruni. Tamburini Editore, Milan,Italy, ed. 12, 1964. 748 pp. Illus. L.7,000.
Collision Phenomena in Ionized Gases.Earl W. McDaniel. Wiley, New York,1964. 797 pp. Illus. $17.50.
Collision Theory. Marvin L. Gold-
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berger and Kenneth M. Watson. Wiley,New York, 1964. 929 pp. Illus.
Colored Symmetry. A series of publi-cations from the Institute of Crystallog-raphy, Academy of Sciences of theU.S.S.R., 1951-1958. A. V. Shubnikov,N. V. Belov, and others. Translated fromthe Russian editions by Jack Itzkoff andJack Gollob. William T. Holser, Ed. Per-gamon, London; Macmillan, New York,1964. 289 pp. Illus. $9.75.Concepts of Real Analysis. Charles A.
Hayes, Jr. Wiley, New York, 1964. 202pp. Illus. $6.50.
Concise Inorganic Chemistry. J. D.Lee. Van Nostrand, Princeton, N.J., 1964.260 pp. Illus. $8.50.
Cryogenics. Michael McClintock. Rein-hold, New York; Chapman and Hall,London, 1964. 282 pp. Illus. $10.75.The Cyanine Dyes and Related Com-
pounds. Frances M. Hamer. Interscience(Wiley), New York, 1964. 724 pp. Illus.$45.
Descriptive Physical Oceanography.An introduction. George L. Pickard. Per-gamon, London; Macmillan, New York,1964. 207 pp. Illus. $4.50.The Development of Weak Interaction
Theory. P. K. Kabir, Ed. Gordon andBreach, New York, 1963. 312 pp. Illus.$4.95Developments in Applied Spectros-
copy. vol. 3. Proceedings, 14th AnnualMid-America Spectroscopy Symposium(Chicago, Ill.), May 1963. J. E. Forretteand E. Lanterman, Eds. Plenum Press,New York, 1964. 419 pp. Illus. $17.50.
Differential Equations with Applica-tions. Herman Betz, Paul B. Burcham,and George M. Ewing. Harper and RowNew York, ed. 2, 1964. 358 pp. Illus.$7.50.
Digital Storage Systems. William Ren-wick. Wiley, New York, 1964. 222 pp.Illus. $8.50.
Elastic Liquids. An introductory vectortreatment of finite-strain polymer rheol-ogy. A. S. Lodge. Academic Press, NewYork, 1964. 401 pp. Illus. $12.
Electrical Circuits with Variable Pa-rameters, Including Pulsed-Control Sys-tems. V. A. Taft. Translated from theRussian edition (Moscow, 1960) by F.Immirzi. R. C. Glass, Ed. Pergamon,London; Macmillan, New York, 1964.121 pp. Illus. $7.50.Elements of Compressible Flow. F.
Cheers. Wiley, New York, 1963. 174 pp.Illus. $6.
Elements of the Theory of Gases. Sid-ney Golden. Addison-Wesley, Reading,Mass., 1964. 160 pp. Illus. $5.
Essentials of Algebra and Trigonom-etry. Frederick H. Young. Addison-Wesley, Reading, Mass., 1964. 158 pp.Illus. $5.
Expected Values of Discrete RandomVariables and Elementary Statistics. AllenL. Edwards. Wiley, New York, 1964.158 pp. Illus. Paper, $3.95; cloth, $5.95.
Extrusion of Plastics. E. G. Fisher.Iliffe, London; Interscience (Wiley), NewYork, ed 2, 1964. 271 pp. Illus. $12.The Feynman Lectures on Physics. vol.
2, The Electromagnetic Field. Richard P.Feynman, Robert B. Leighton, and Mat-thew Sands. Addison-Wesley, Reading,Mass., 1964. Unpaged. Illus. $8.75.
SCIENCE, VOL. 145
Fluvial Processes in Geomorphology.Luna B. Leopold, M. Gordon Wolman,and John P. Miller. Freeman, San Fran-cisco, Calif., 1964. 536 pp. Illus. $10.
Free Radical Reactions in PreparativeOrganic Chemistry. George Sosnovsky.Macmillan, New York, 1964. 456 pp. Illus.$17.Frequency Filter Methods. Torbern
Laurent. Wiley, New York; Almqvist andWiksell, Stockholm, 1964. 320 pp. Illus.$17.50.
Frequency of Self-Oscillations. JanuszGroszkowski. Pergamon, London; Mac-millan, New York, 1964. 542 pp. Illus.$15.The Gas-Phase Oxidation of Hydrocar-
bons. V. Ya. Shtern. Translated from theRussian edition (Moscow, 1960) by M. F.Mullins. B. P Mullins, Ed. Pergamon,London; Macmillan, New York, 1964.720 pp. Illus. $28.50.Gun Drilling and Trepanning. A prac-
tical and intensive treatment of the tools,machines, processes, and related ele-ments in the precision machining of deepholes. Prepared under the supervision ofthe American Soc. of Tool and Manu-facturing Engineers. Prentice-Hall, Engle-wood Cliffs, N.J., 1964. 160 pp. Illus.$6.95.Handbook of Preparative Inorganic
Chemistry. vol. 1. George Brauer, Ed.Translated from the German edition(Stuttgart, 1960) by Scripta Technica.Reed F. Riley, Ed. Academic Press, NewYork, ed. 2, 1963. 1030 pp. Illus. $36.High Speed Testing. vol 4. A sym-
posium (Boston, Mass.), May 1963. Al-bert G. H. Dietz and Frederick R. Eirich,Eds. Interscience (Wiley), New York. 314pp. Illus. Paper, $12.80.
High-Velocity Forming of Metals. Aconcise yet intensive treatment of themechanics, principles, equipment, andmethods employed in the forming ofmetals by the explosive, electro-hydraulic,magnetic-pulse, and pneumatic-mechani-cal processes. Prepared under the su-pervision of the American Soc. of Tooland Manufacturing Engineers. Prentice-Hall, Englewood Cliffs, N.J., 1964. 202pp. Illus. $7.50.
Information Theory. An introductionfor scientists and engineers. Gordon Rais-beck. M.I.T. Press, Cambridge, Mass.,1964. 117 pp. Illus. $4.An Introduction to Crystallography.
F. C. Phillips. Wiley, New York, ed. 3,1964. 350 pp. Illus. $6.Introduction to Field Theovry and Dis-
persion Relations. R. Hagedorn. Per-gamon, London; Macmillan, New York,1964. 135 pp. Illus. $5.An Introduction to Industrial Radiol-
ogy. J. C. Rockley. Butterworth, London,1964. 247 pp. Illus. $10.75.
Introduction to Mathematics. Bruce E.Meserve and Max A. Sobel. Prentice-Hall,Englewood Cliffs, N.J., 1964. 302 pp.Illus. $5.95.An Introduction to Modem Physics.
H. Messel and S. T. Butler, Eds. St. Mar-tin's Press, New York, 1964. 273 pp.Illus. $5.
Introduction to Plasma Physics. MartinA. Uman. McGraw-Hill, New York, 1964.240 pp. Illus. $10.
Introduction to the Logical Design of
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Coors can help you with laboratory filtrationby providing you with a complete range offiltration equipment in many sizes and styles,all immediately available through your locallaboratory supply dealer. Coors filters comein 15 styles, with a total of 74 sizes matchedto meet your exacting requirements. Coorsfiltering devices include the ;220 and t221Filter cones; :270, :290, #291, :300 Goochcrucibles; :765, :767, :769 Porous Bottomcrucibles; #490 fixed plate Buchner funnels;#491 loose plate Buchner funnels. SpecialBuchner funnels include the double-wall4t495, two-piece X496 and table type :497and t498; #510 Hirsch funnel; #511 Conicalfunnel; #775 Emich micro-filtersticks andvarious porous cups, plates and cylinders.Write for Bulletin No. 498, showing filters.
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Switching Systems. H. C. Torng. Addison-Wesley, Reading. Mass., 1964. 298 pp.Illus. $9.75.An Introduction to the Theory of the
Formation of Frozen Rocks. T. A. TVu-tyunov. Transl-ited from the Russian edi-tion hv J. 0. H. Muhlhaus. Pergamon.London: Macmillan, New York, 1964.108 pp. Illus. $7.50.
Invariant Imbedding and Time-Depend-ent Transport Processes. R. E. Bellman.H. H. Kagiwada. R. E. Kalaba. and NI. C.PrestruLd. Elsevier. New York, 1964. 270pp. Illtus. $7.50A Laboratory Course in General Cheni-
istry. Wendell NI. Latimer and RichaardE. Powell. Maccmillan, New York, 1964.144 pp. lluis. Paper. $2.95.
Limits and Continuity. William K.Smith. Macmillkn. New York, 1964. 142pp. Illus. Paper, $3.
Lo", Temperature Physics. Proceedings.8th International Conference (London).September 1962. R. 0. Davies. Ed.Buttei-wou-th, Washington. D.C., 1963. 465pp. IIlIs. $39.
Marine Geology of the Pacific. H. W.Menard. McGraw-Hill. New York, 1964.285 pp. lIlIts. $12.50.
Materials and Fuels for High-Tempera-ture Nuclear Energy Applications. Pro-ceedings, Nuational Topical Meeting,American N uclear Societv (San Diego.Calif.), April 1962. NI. T. Simnad andL. R. ZuLmlwalt, Eds. M.I.T. Press. Camn-bridge. M4ass.. 1964. 423 pp. Illus. $12.The Mathematical Principles of Nat-
ural Philosophy. Isaac Newton. Introduc-tion by Alfred del Vecchio. PhilosophicalLibrlarv. News York, 1964. 447 pp. Illus.$10.
Matrix Methods in Optical InstrumentDesign. Willem Brouwer. Benjamin, NewYork, 1964. 302 pp. Illus. Paper, $5.95;cloth. $9.The Mechanics of Turbulence. Proceed-
ings (in English) of the symposiumsponsored by the Centre National de laRecherche Scientifiqtue (Marseilles,France). AuLgust-September 1961. Gor-don and Breach, New York, 1964. 460 pp.Illus. $19.50.Modern Basic Mathematics. Hobart C.
Carter. Appleton-Century-Crofts. NewYork, 1964. 478 pp. Illus. $6.50.Modern Inorganic Pharmaceutical
Chemistry. Clarence A. Discher. Wiley,New York, 1964. 648 pp. Illus. $12.
Nonlinear Integral Equations. Proceed-ings of an advanced seminar conductedby the Mathemaltics Research Center, U.S.Army (Madison. Wis.), April 1963. P. M.Anselone. Ed. Univ. of Wisconsin Press,Madison, 1964. 390 pp. Illus. $6.50.
Nonlinear-Magnetic Control Devices.Basic principles, characteristics, and ap-plications. William A. Geyger. McGraw-Hill. News York. 1964. 420 pp. Illus.$12.50.Nuclear Interactions. Sergio DeBene-
detti. Wiley. New York, 1964. 660 pp.Illus. $16.
Nuclear Orientation. M. E. Rose. Ed.Gordon and Breach, New York, 1963.335 pp. Illus. $4.95.
Nuclear Power Systems. An introductorytext. C. D. Gregg King. Macmillan, NewYork, London, 1964. 496 pp. Illus. $13.
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Micro- and Semimicro Methods. Nich-olas D. Cheronis and T. S. Ma. Inter-science (Wiley), New York, 1964. 722pp. Illus. $25.Organolead Chemistry. A concise review,
with special reference to the literaturecovering the period January 1953 to July1963. L. C. Willemsen. Prepared for theInternational Lead Zinc Research Organ-ization (New York) by Organische Chem-ische Institut, Utrecht, Netherlands, 1964.111 pp. Free.PCT, Spin and Statistics, and All
That. R. F. Streater and A. S. Wightman.Benjamin, New York, 1964. 191 pp. Illus.Paper, $4.95; cloth, $9.
Physics of Atomic Collisions. J. B.Hasted. Butterworth, Washington, D.C.,1964. 546 pp. Illus. $26.
Principles of Chemistry. Joel H. Hilde-brand and Richard E. Powell. Macmillan,New York, London, ed. 7, 1964. 413 pp.Illus. $7.50.The Principles of Mathematics. Bert-
rand Russell. Norton, New York, ed. 2,1964. 574 pp. Paper, $2.95.
Progress in Reaction Kinetics. vol. 2.G. Porter, Ed. Pergamon, London; Mac-millan, New York, 1964. 399 pp. Illus.$15. Eight papers: "The rate constantsof halogen atom reactions," G. C. Fettisand J. H. Knox; "Mercury photosensitizedreactions," R. J. Cvetanovi6; "The reac-tions of methylene and some simple car-benes," H. M. Frey; "The kinetics ofcis-trans isomerizations," R. B. Cundall;"The kinetics of propagation of anionicpolymerization and co-polymerization,"M. Szwarc and J. Smid; "Rate constantsof protolytic reactions in aqueous solu-tion," M. Eigen, W. Kruse, G. Maass,and L. De Maeyer; "The rates of reactionof some haem compounds," Q. H. Gib-son; and "Kinetic treatment of consecu-tive processes," R. M. Noyes.
Progress in Solid State Chemistry. vol. 1.H, Reiss, Ed. Pergamon, London; Mac-millan, New York, 1964. 544 pp. Illus.$17.50. Eleven papers: "The thermal ex-pansion of ceramic crystals," H. P. Kirch-ner; "Lattice energies and related topics,"M. F. C. Ladd and W. H. Lee; "Phaseswith the nickel arsenide and closely-related structures," A. Kjekshus and W.B. Pearson; "Lattice imperfections andthe thermal conductivity of solids," D.Greig; "The relationship of photolumi-nescence and electroluminescence tostructure," D. W. G. Ballentyne; "Ferri-electricity in crystals," C. F. Pulvari;"Alloy semiconductors," J. C. Woolley;"Physico-chemical aspects of organic semi-conductors," H. A. Pohl; "X-ray diffrac-tion studies of crystal perfection," L. V.Azaroff; "Applications of nuclear quadru-pole resonance," G. A. Jeffrey and T.Sakurai; and "Use of infrared and ramanspectroscopy in the study of organo-metallic compounds," D. K. Huggins andH. D. Kaesz.
Pyrazolones, Pyrazolidones, and Deriv-atives. Richard H. Wiley and Paul Wiley.Interscience (Wiley), New York, 1964.555 pp. Illus. $26.
Quaternary Geologic History of theCoastal Plain of Rio Grande do Sul,Brazil. Patrick J. V. Delaney. LouisianaState Univ. Press. Baton Rouge, 1963.75 pp. Illus. Paper, $2.50.
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Ith:
PIPErTRIGID . STERILEDISPOSABLE
sendfor
samples
* non-wettable...minimizes meriiscus,reduces drainage"hold-back" errors
* chemically clean* biologically clean* crystal clear* cotton plugged* sharp graduations
3 graduation markings
1 mIxO.11 ml x 0.011.1 mlI (0.5, 1.0,1.1graduations)
convenient usepackages
100 (individuallywrapped) in dispensingbox, or 25 in "poly"bag and other packageforms. Availablethrough your local dis-tributor.
Is>sWss- FFALCON PLASTICSDIVISION OF
B.D LABORATORIES, INC., RUTHERFORD, NEW JERSEYB.D AND FALCON ARE TRADEMARKS 12164
SCIENCE, VOL. 145
I
NOW.."A PRACTICAL LASERIPerkin-Elmer's Model 5200 is so compact... so rugged . . . so simple to use, that itmakes practical almost any applicationrequiring the unique characteristics of acontinuous laser beam .. . even on pro-'duction equipment.
This stable, noise free source of brightcoherent light is already replacingexpensive and hard -to-use opticalalignment and measuring systems.Furthermore, it is extending the use ofprecise alignment and measuring systemsto applications previously consideredimpractical.
For applications requiring a lot of lightin a small diameter beam, the brightnessof the Model 5200 is thousands of timesgreater than the most intense arc lamps.
When precise dimensions are important,the coherent nature of laser light..,to adegree never before possible...extendsthe use of interferometry to entirelynew applications.
Are you considering using a laser?To obtain detailed information on theModel 5200 laser, contact Electro-OpticalProduct Marketing, Perkin-Elmer Cor-poration,910 Danbury Road, Norwalk,Connecticut. Or phone 203-847-0411.
PERKIN-ELMER
Recent Geomorphic History of thePontchartrain Basin. Roger T. Saucier.Louisiana State Univ. Press, BatonRouge, 1963. 128 pp. Illus. Paper, $3.
Rectified Lunar Atlas. Suppi. No. 2,Photographic Lutnar Atlas. E. A. Whit-aker, G. P. Kuiper, W. K. Hartmann,and L. H. Spradley. Univ. of ArizonaPress, Tucson, 1963. Unpaged. Illus.Plates. $35.La Retention et la Migration des Ions
Radioactifs dans les Sols. An interna-tional colloquium (Saclay, France), Oc-tober 1962. Centre d'Etudes Nucleairesde Saclay, Gif-sur-Yvette; Presses Uni-versitaires de France, Paris, 1963. 296pp. Illus.
Rheo-optics of Polymers. A symposium(Amherst, Mass.), August 1963, heldunder the auspices of the Polymer Re-search Institute. Interscience (Wiley).New York, 1964. 200 pp. Illus. Paper, $8.
Several Complex Variables. Local the-ory. M. Herv6. Published for the TataInstitute of Fundamental Research (Bom-bay, India), by Oxford Univ. Press, NewYork. 1963. 142 pp. llus. Paper, $4.
Signal Detection and Recognition byHuman Observers. Contemporary read-ings. John A. Swets, Ed. Wiley, NewYork, 1964. 714 pp. Illus. $17.50.
Solubilities of Inorganic and OrganicCompounds. vol. 2. pt. 1, Ternary Sy.s-teen7s. H. Stephen and T. Stephen, Eds.Pergamon, London; Macmillan, NewYork, 1964. 944 pp. $28.50.
Space Physics and Radio Astronomy.H. Messel and S. T. Butler, Eds. St.Martin's Press, New York, 1964. 174 pp.Illus. $4.25.
Statistical Mechanics of Charged Par-ticles. R. Balescu. Interscience (Wiley),New York. 1963. 491 pp. Illus. $15.The Structure of Atmospheric Turbu-
lence. John L. Lumley and Hans A.Panofsky. lnterscience (Wiley), NewYork, 1964. 251 pp. Illus. $9.50
Tables of Spectrophotometric Absorp-tion Data of Compounds Used for theColorinietric Determination of Elements.Prepared by the Commission on Spectro-chemical and other Optical Proceduresfor Analysis. Butterworth, Washington,D.C., 1963. 642 pp. Illus. $25.
Theory and Application of the z-Trans-form Method. E. I. Jury. Wiley, NewYork, 1964. 344 pp. Illus. $11.50.
Theory and Methods of Nuclear Reac-tor Calculations. G. I. Marchuk. Trans-lated from the Russian edition (Moscow,1962). Consultants Bureau, New York,1964. 207 pp. Illus. Paper, $40.The Theory of Recycle Processes in
Chemical Engineering. M. F. Nagiev.Translated from the Russian edition(Moscow, 1958) by R. Hardbottle. R. M.Nedderman, Ed. Pergamon, London; Mac-millan, New York, 1964. 294 pp. Illus.$15.
U.S.S.R. Direct Current Research. Re-ports of the Leningrad Direct CurrentResearch Institute. Translated from theRussian edition (Moscow, 1957) by LouisAnderson Fenn. Pergamon, London; Mac-millan, New York, 1964. 295 pp. Illus.$15.The Universe and Its Origin. H. Messel
and S. T. Butler, Eds. St. Martin's Press,New York, 1964. 147 pp. Illus. $3.75.
10 JULY 1964 215
I.-
Gbc %& Is0
/us for being, azy!||(and using the EC 470 Vertical Gel Electrophoresis Apparatus)
RAPHsamples on a single acrylamide get-Reproducible and Intercomparable.
WORKING TIME = 10 MINUTES
Whether you are lazy or not, you wvill enjoy saving up to twohours daily conducting electrophoresis research. Using theEC 470 Apparatus, here is how it is done:1. Cell locks itself together no furthei manipulation2. Pour in sintgle gel solution no further manipulation3. Apply samples directly-no further imianipulation
After running for one hour, remove gel slob.4. Stain together, destain together, and evaluate together.
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216
AAAS
Symposium Volume
SYSTEMS OF UNITS-NATIONAL ANDINTERNATIONAL ASPECTS
Edited by Carl F. Kayan
A look at the growing problemsin the conflict between interna-tional usages and our own nationalsystem of units. This volume con-siders them both subjectively andobjectively in order to alert thetechnologist to the clamor, needs,and proposals to ameliorate theconfusion of measurement. .$6.75AAAS members discount price, $5.75
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INDEX TOADVERTISERS
10 July 1964Ace Glass Inc i............ 105
Ainsworth, Wm., & Sons, Inc...... 107
Air Products and Chemicals Inc. .....199American Edelstaal, Inc ....... 195ANS, Inc ............. 92
Baird-Atomic, Inc 94
Bausch & Lomb Inc 189
Beckman Instruments, Inc., Scientificand Process Instruments Div. 110, 111
Blickman, S., Inc .......... 208
Borden Chemical Co ......... 210
Brush Instruments ............... 86Chemical Rubber Co ........ 200
Consolidated Electrodynamics ..... 196Cooke, Troughton & Simms, Inc. 196Coors Porcelain Co. .............. 212
Denominator Co., Inc. ............ 198
Dimco-Gray Co. ................. 209
Durrum Instrument Corp. ......... 211
E-C Apparatus Corp. ......... 209, 216
Edmund Scientific Co. ............ 191
Elgeet Optical Co., Inc. ........... 90
Falcon Plastics, Div. ofB-D Laboratories, Inc. ......... 214
Four Continent Book Corp ....... . 194
Gilford Instrument Laboratories, Inc. 195Glas-Col Apparatus Co 113
Hacker, William J., & Co., Inc. 204
Hamilton Co . ................... 95
High Voltage Engineering Corp .. .... 114
Honeywell Photographic Products,Denver Div. .................. 200
Instrumentation Specialties Co. 198
Instruments for Research and Industry 211International Equipment Co. ....... 93
Jarrell-Ash Co. .................. 96
Klett Manufacturing Co., Inc. ...... 213
LaPine Scientific Co. 194
London Co.. 102
Maryland Plastics Inc 213
Matheson ........................ 203Mechanical Enterprises, Inc 210
Millipore Filter Corp.. 194
Nalge Co., Inc . .................. 208
New Brunswick Scientific Co., Inc. .. 209Nuclear-Chicago Corp ........ 220
Nuclear Data, Inc .......... 101
Ohaus Scale Corp .......... 219
Pennsylvania Fluorocarbon, Inc. 192
Perkin-Elmer Corp. ........... 99, 215
Pharmacia Fine Chemicals Inc .... 97
Phipps & Bird, Inc. 217
Photovolt Corp. .215Pilot Chemicals, Inc ......... 196
Pioneer Plastics, Inc ......... 216
Polaroid Corp. 108
Pyrodyne, Inc. 198
Sage Instuments, Inc. 214
Savant Instruments, Inc ....... 213
Scientific Industries Inc ....... 193
Sigmamotor, Inc. 198
Sorvall, Ivan, Inc................. 100
Standard Scientific Supply Corp. 210Statham Instruments, Inc 188
Technical Measurements Corp. 116
Technicon Chromatography Corp .. 91Texas Instruments Inc. 205
Tektronix, Inc. .................. 190
Thermolyne Corp. ............... 212
Thermoplastic Processes, Inc. ...... 204
Tracerlab ........................ 191U.S. Stoneware .................. 188Varian Associates, Recorder Div.-... 106
White, S. S., Industrial Airbrasive .. 197Wilmot Castle Co 87
Yellow Springs Instrument Co., Inc. . 192Zeiss, Carl, Inc . ................. 206
SCIENCE, VOL. 145
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