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FREE 10 Day Trial on any UNITRON MicroscopeProve their value and
quality in your own laboratory!
UNITRON Photomicrography SetDuplicates the performance of costly
appara-tus. Mounting brackets adjust to accommo-date your present
camera (35mm., No. 120,No. 127, etc.). Viewing telescope permitsall
adjustments to be made while camera isin place and allows
continuous observation ofthe specimen even during time
exposures.
Only $39.95
UNITRON Phase Contrast, MPEIndispensable for the study of living
cells andother highly transparent material. Continuoustransition
from phase to bright-field micros-copy by adjusting condenser
height. Choice of4 contrasts. Mechanical stage. Three
phaseobjectives: PlOX, P4OX, P1OOX. Eyepieces:5X, lOX, 15X.
OnlyStudent Model MPEA, 20-600X.
Oi
UNITRON Camera Microscopeand Metallograph
A completely self-contained unit for visualobservation,
projection, and photography ofboth opaque and transparent
specimens. Built-in 31,4' x 414" camera, transformer,
andilluminator. Optics include 5 objectives and h7 eyepieces.
Mechanical stage, polarizing ap-paratus, micrometers, etc.
Magnification: 25-2000X.Low power accessories, 35mm camera
attach-ment, and binocular eyepiece available at extracost.
Only $1,145
$265
inly $99
UNITRON Metallurgical, MMUFor metals and opaque specimens, and
alsotransparent specimens under both ordinaryand polarized light.
Vertical, oblique, andtransmitted illumination. Transformer
housedin microscope base. Focusable stage. Polarizingappatus and
filters. Objeoives: 5X, lOX.40X, IOOX, Eyepieces: 5X, lOX, 15R.
Only $287Student Model MMA, 25-600X.
Only $149
UNITRON Stereoscopic, MSHA versatile laboratory instrument
givingan exceptionally wide field of view withgreat depth of focus
Inclined binocularhead with distance and diopter adjust-ments.
Revolving nosepiece. Separate lowstand. Choice of 3 objectives
among IX,2X, 3X, 6X. Eyepieces: 8X, 12X, 15X
Only $3141Low stand models available.
III-1IIIIIIIIIIIIIIIIIIIII
The low cost of UNITRON MICROSCOPES has madeit possible for even
the laboratory with limited resourcesto have at its disposal modern
microscopes of unsurpassedprecision. Large organizations as well as
small have beenquick to recognize the outstanding value of
UNITRONMICROSCOPES as well as their unexcelled optical
andmechanical performance. Well known users include lead-ing
universities, industrial firms, and research laboratoriessuch
as:Harvard UniversityGeneral Motors Corp.U. S. Dep't. of
AgricultureCornell UniversityPrinceton UniversityUniversity of
MichiganCBS HytronIBM CorporationU. S. ArmyU. S. NavyNational
Bureau of Standards
Union Carbide and Carbon Co.Brown UniversityGeneral Electric
Co.Northwestern UniversityGoodyear Atomic Corp.Corn Products
Refining Co.Mass. Inst. of TechnologyYale UniversityArthur D.
Little, Inc.Raytheon Manufacturing Co.Sperry Products
We invite you to try any UNITRON Microscope in yourown
laboratory for 10 days at absolutely no cost orobligation. Let the
instrument prove its value to youbefore you decide to purchase.
The UNITRON Microscope Catalogis yours for the asking!
This colorful illustrated catalog gives complete specifications
on allof the instruments briefly described on this page as well as
otherswhich we know you will find of interest. Write for your free
copy.
UNITED SCIENTIFICCOMPANY
264-6 Milk St., Dept. G.S., Boston 9, Mass.
INI ITRtN RinnriJnsr MnAIPuCv I* I I* r Iv9_uwuI* ssuwzuBuilt-in
graduated mechanical stage. Accessorygraduated monocular tube. Fine
focus cali-brated in microns. Four objectives: 4X, lOX,40X, lOOX.
Paired eyepieces: 5X, lOX, 15X.Model BMLK: for ordinary microscopy,
con-denser N.A. 1.4.
Only $399Model BMPE: binocular version of Phasemodel MPE
described above.
Only $490I--------------
UNITRON Auto-illumination,MLU
An ideal laboratory or medical microscope.Built-in illuminating
system with transformerhoused in microscope base. An
eyepieceprojection prism is included which makes theinstrument a
self-contained small projector.Graduated mechanical stage.
Objectives: IOX,40X, 10OX. Eyepieces: 5X, 1OX, 15X.
Only $229Model MLK, similar to above, without auto-illumination
feature.
Only $198_
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from Saunders
Krueger's Microbiology
This superbly written, easy-to-understand text is ideal for
introductorycourses in general bacteriology or microbiology. All
the basic principles,concepts and viewpoints of microbiology are
brought into sharp, clear focus.
Every aspect of microbiology is covered . . . without unduly
emphasizing anyparticular branch of the subject. The book's scope
embraces: a general surveyof the subject plus a historical
introduction; the principal types of micro-organisms; physiological
aspects of microorganisms; microbiologic techniquesand methods
including the action of chemotherapeutic agents on microorgan-isms;
application of microbiology to various aspects of everyday life;
and a dis-cussion of the disease producing activities of
microorganisms.
Principles of Microbiology. By WALTER W. KRUEGER, Professor of
Bacteriology, Grand Rapids Junior College,Grand Rapids, Michigan.
648 pages, 6" x 9", with 148 illustrations. $5.50.
New (2nd) Edition - Turner's EndocrinologyThis New (2nd) Edition
constitutes a thorough revision of almost every chapterto
incorporate the most up-to-date concepts of endocrinology viewed on
abroad biologic level. Some new chapters have been added: The
Principles ofEndocrinology, Adaptive Reactions to Stress and
Endocrine-Like Mechanisms.More attention has been devoted to
neurosecretion, in keeping with theconcept that neurosecretory
cells perform a liaison role, connecting the nervousand endocrine
systems.The new order of topics provides a more logical arrangement
of material. Thesequence in each chapter is: anatomy, biochemistry,
physiology and a generaltreatment of clinical applications. New
photographs illustrating typicalendocrine disturbances in man and
animals have been added.
General Endocrinology. By C. DONNELL TURNER, Ph.D., Lecturer in
Biology, Tokyo Army Education Center,Tokyo, Japan. About 600 pages,
6" x 9", with 349 illustrations on 160 figures.
New (2nd) Edition-Ready in May, 1955
W. B. SAUNDERS COMPANYWest Washington Square Philadelphia 5
29 APRIL 1955 1A
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MONOMOLECULAR LAYERS
Edited by Harry Sobotka6 x 9 inches, 215 pages, 62
illustrations, index,
clothbound, April 1954Price $4.25. AAAS members' prepaid order
price $3.75
A symposium volume of the American Association for
theAdvancement of Science
The aim of this volume is to give a cross section of recent
progress in thefield of monomolecular layers-on water surfaces,
solid surfaces, and oil-waterinterfaces. The papers supply
fundamental data for problems in lubricationand detergency, as well
as for questions of biochemical concern such as thedeternmination
of molecular weights of proteins.
The variety and scope of the volume suggest that two-dimensional
chem-istry should not be regarded as an isolated specialty, but
that its methods andconcepts impinge on physical and colloid
chemistry, on organic and biochem-istry; they contribute to
analytical chemistry and to chemical engineering andtechnology.
The participants comprise some of the pioneer research workers
in thisfield of chemistry. The papers review the work of others and
report the con-tributions of the authors.
CONTENTSModern Film Techniques and Their Application
to Biochemical ReactionsThe Determination of Molecular Weights
of
Proteins by the Horizontal Surface BalanceMechanical Properties
of the Surface Films on
Aqueous Solutions of DetergentsStudy of Adsorption at a
Solution-Air Interface
by RadiotracsDeposited Radiove MonolayersHydrophobic Monolayers
and Their Adsorption
from Aqueous SolutionA Review of the Properties of Films at
Oil-Water
InterfacesChemical Reactions of Simple and Mixed Mono.
molecular LayersChemical Reactions and Electric Potential in
Monolayers
HANS TRURNIT, Army Chemical Center, Md.E. MISHUCK and F.
EIRICHPolytechnic Institute of BrooklynA. P. BRADY and A. G.
BROWNStanford Research InstituteJ. K. DIXON, C. M. JUDSON, and D.
J. SALLEYAmerican Cyanamid Co., Stamford, Conn.D. E. BEISCHER, U.
S. Naval Schoolof Aviation Medicine, PensacolaELAINE G. SHAFRIN and
W uLAM A. ZISMANNaval Research Laboratory, WashingtonE. HUTCHINSON,
Stanford UniversityHARRY SOBOTKA and SHIRLEY ROSENBERGThe Mount
Sinai Hospital, New YorkE. HAVINGA, University of Leiden
American Association for the Advancement of Science1515
Massachusetts Avenue, NW, Washington 5, D. C.
English Agents: Bailey Bros & Swinfez, Ltd., 46 St GilesHh
Stet o W. C 2IL .j2A SCIENCE) VOL. 121
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G.A.B. Interference Filters(Made in Switzerland)
for isolating narrow spectral bands
aI5 II I AI I I I_Setrl Rg 400-900 mllimicrons
Spcta W }+Rfidf4Tth121 m§ Trae. 45-50Sie 2"l x l2" Ohr size on
orde'T|r.|_
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Solubility,formation of
colloidal parti-cles', and surface
reactions in silicaand silicate systemsare clearly treated
THE COLLOIDCHEMISTRYOF SILICA& SILICATES
By RALPH K. ILER, Research Manager, GrasselliChemicals
Department, E. I. du Pont de Nemoursand Company, Inc., Experimental
Station, Wilming-ton, Delaware
FOR the first time the numerous aspects of the chem-istry of
silica and silicates are brought together andconsidered from the
standpoint of colloid science. Thestructure and behavior of the
major colloidal mineralsof the clay, asbestos, and mica classes are
reviewed andthe interaction of silicic acid with organic
compoundsreveals points of significance to biologists.
Contents. Preface. The Silica-Water System. The Solu-ble
Silicates. The Chemistry of Silicic Acid. Esters ofSilicic and
Polysilicic Acid. Colloidal Silica. AmorphousSilica Gels and
Powders. Colloidal Silicates. SurfaceChemistry of Silica and
Silicates. Silica in LivingOrganisms. Author Index. Subject
Index.
336 pages, 20 tables, 62 figures. $5.50
Cornell University Press124 Roberts Place, Ithaca, New York
AAAS SYMPOSIUM VOLUME
SOVIET SCIENCESecond Printing
Russian Genetics
Russian Physiology andPathology
Russian Psychology andPsychiatry
Scientific Method andSocial Science: Eastand West
Russian Contribution toSoil Science
Soviet Physics andChemistry
Soviet MathematicsScience and IntellectualFreedom in Russia
An Appraisal of Sciencein the USSR
TheodosiusDobzhansky
W. Horsley Gantt
Ivan D. London
Russell L. Ackoff
J. S. Joffe
John TurkevichJ. R. Kline
Lazar Volin
Conway Zirkle
6 x 9 inches, clothbound, 115 pages, price $1.25
AMERICAN ASSOCIATION FOR THEADVANCEMENT OF SCIENCE1515 Mass.
Ave., NW, Washington 5, D. C.
SCIENCE, VOL. 121
GARCEAU ELECTROENCEPHALOGRAPHSA.C. Operated No BatteriesInkless
Writing Require no Shieldlng
Shipped Ready to Run Prompt Delivery
THE JUNIOR GARCEAUELECTROENCEPHALOGRAPH
A simplified inexpensive instrument for recording
electricalpotentials of the brain. Built-in interference
eliminators per-mit use anywhere. Inkless records-no photography or
film-development required. Instantaneous localization with any2 of
the 10 leads. Price $575.00 complete.
All Garceau Electroencephalographs operate en-tirely from the
115 volts 50 or 60 cycle power lines.
ELECTRO-MEDICAL LABORATORY, INC.SOUTH WOODSTOCK 2, VERMONT
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.PROFESSIOAL TYPE_el PR-2 Forcal research visual
ervation and pho-
icrogra-phy. Auto-
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Whatever your microscopy requirements-from general
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time and ensure you the bright, easy-to-see images you need.
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isual observations
photomicrography. Comfortable to the touch, even after hours of
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hintensity; quick Easy on your eyes, too: no stray light, no
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Lamp is replaced in seconds automatically centered!
0 Dustproof, trouble-free construction.
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WRITE FOR DETAILED LITERATURE* Ask for Folder D-1042. Bausch
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SCIENCE, VOL. 121
