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Wiley books for study, research and reference-

DAIRY BACTERIOLOGY INTRODUCTION TOby B. W. Hammer, Formerly Professor of Dairy ORGANIC CHEMISTRYBacteriology, University of Wisconsin.

The new Third Edition has an added chapteron dairy plant water supplies. Discussions ofpowdered milk, butter, cheeses, and water sup-plies have been expanded in the light of present-day concepts. A number of sections have beencut and others enlarged. As in previous edi-tions, a direct method of instruction is used andclear-cut sources of information are presentedfor both pathogenic and normal bacterial de-velopments in each dairy product. Fermenta-tions in milk and its derivatives are againstressed, because the author considers it essen-tial to have an understanding of these factors.

Third Edition in AprilApproximately 596 pages

Probable price, $6.00

by Ira D. Garard, Professor of Chemistry, NewJersey College for Women.

An introduction to theoretical and experi-mental organic chemistry, this standard text-book is now thoroughly revised and brought upto date. Changes in the new edition include:expansion of the section on azeotropy; new sec-tions covering sulphur derivatives and nitro-paraffins; a discussion of fumaric, maleic andadipic acids; a brief treatment of polarizedlight; inclusion of recent advances in the pe-troleum and rubber industries.

Third Edition in FebruaryApproximately 400 pages

Probable price, $3.50

DETOXIATIONBACTERIOLOGYME CHANI SMSIO A Textbook of Microorganismsby Fred W. Tanner, Professor of Bacteriology

by R. T. Williams, Senior Lecturer in Biochem- and Head of the Department, University ofistry, University of Liverpool, England. Illinois; and Fred W. Tamner, Jr., Bacteriolo-

- gist, U. S. Department of Agriculture,n A__A_ x_ __ _._,_ L __ At.-Gathers together in logical order the availableinformation on the metabolism of organic com-pounds foreign to the body, so that workinghypotheses can be advanced. It covers themetabolism of: aliphatic compounds; cyclo-hexane derivatives; aromatic hydrocarbons;halogenated aromatic hydrocarbons; phenols;aromatic alcohols, ethers, aldehydes, ketones,amides; aromatic acids; organic cyanides; aro-matic nitro, amino and azo compounds; sul-phones, sulphonic acids, sulphonamides; ter-penes, camphors; heterocyclic compounds; or-ganic compounds of arsenic.

Ready in MarchProbable price, $5.50

288 pages

The original plan of the book is retained inthe forthcoming Fourth Edition, with the fol-lowing new material included: ultramicroscopic,forms of life; and variability of microorganisms,including various forms of modern pleomorph-ism. Pathogenic organisms are not stressed inimportance over non-pathogenic organisms. Therest of the book has been rewritten to includethe latest reliable developments. A large glos-sary of bacteriological terms is included and 25new illustrations have been added.

Fourth Edition in FebruaryApproximately 627 pages

Probable price, $4.50

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

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The Nature ofthe Chemical Bond

BY LINUS PAULINGProfessor of Chemistry

California Institute of Technology

THIS TEXTBOOK treats the prob-lems of chemical binding and the struc-ture of molecules and crystalline ag-gregates of atoms and molecules fromthe modern point of view. The theoryof the treatment is based chiefly onthe results of the quantum mechanics,with especial emphasis on the reson-ance of molecules among alternativeelectronic structures.On the experimental side classical

chemical methods have been supple-mented by the results of numerousphysical methods perfected in recentyears, including diffraction of electronsby gases and vapors and of x-rays bycrystals, determination of electric andmagnetic moments, and various kindsof thermal measurements.

466 pages, $4.50

Cornell University PressITHACA, NEW YORK

Cornell University Press124 Roberts Place, Ithaca, N. Y.

Please send -me ....... copies of TheNature of the Chemical Bond at $4.50.

Name ...........................

Address ..........................

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That's why we carefully control genetic fac-tors and environment to produce depend-able uniformity year after year in our largecolonies of mice, rats and guinea pigs.

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Personnel PlacementCHARGES FOR CLASSIFIED ADVERTISINGRegular setting 10¢ a word. Minimum charge $2.50 Ioreach insertion. A box number counts as 8 words of theadvertisement (e.g. 25 words plus box number equals 33words). Make checks payable to the AAAS. All inser-tions must be accompanied by correct remittance and sent10 days in advance of publication date to the AdvertisingDepartment, AAAS, 1515 Massachusetts Avenue, N. W.,Washington 5, D. C.

POSITIONS WANTED

The California Medical Bureau, Agency for scientific and lay per-sonnel in medicine, biology, chemistry, physics and allied sciences,supplies teachers, research workers, laboratory dieners, skilled officehelp. Prompt service. Registration free. Your patronage re-spectfully solicited. THE CALIFORNIA MEDICAL BUREAU,Agency, Arcade Medical Center, 696 Colorado Street, Pasadena 1,California.Bacteriologist: Ph.D. with outstanding administrative, teaching,research and industrial experience. Specialist in difficult technics.Available for academic, medical, public health or industrial position.Box 170A, SCIENCE.Biochemist: Ph.D., 28, desires research or teaching fellowship inmedical school, starting September 1948 allowing work toward MD.At present assistant professor large eastern university; seven yearsvaried research and teaching experience. Box 157A, SCIENCE.Biochemist: Teaching appointment in medical biochemistry, pref-erably to conduct course in small department with opportunitiesfor growth. Field: endocrinology. Box 171A, SCIENCE.Botanist: Ph.D. taxonomy, university teaching, rubber industryand OSRD. Publications. Associate professor, age 37. Attrac-tive salary required. Box 172A, SCIENCE.Physical-Organic Ph.D. Chemist, 11 years research experiencepartly on high polymers. Desires interesting pob. Considerany field and location, prefer institutional research. Box 169A,SCIENCE.Physiologist-Pharmacologist: Ph.D., age 37. Eight years inindustrial research; six years teaching in premedical subjects. De-sires teaching position with opportunity for research or industrialresearch with chance for advancement. State salary range. Box173A, SCIENCE.Plant physiologist: Ph.D., June, 1948. Experience teachingassistant botany, physiology, biology. Research in phytoserol-ogy. Desires teaching, teaching-research position. Box 1 74ASCIENCE.

Psychologist: Ph.D., professor in a small college, desires oppor-tunity for work and experience in the field of clinical psychology,all age groups, behavior difficulties, emotional, social and educa-tional maladjustments, etc. P. 0. Box 1788, Spokane 6, Wash-ington.

Research Chemist-Executive. Ph.D. with research and admin-istrative experience in rubber, plastics, textiles, and organic chem-istry. Officer in leading science associations, publications andpatents. Box 176A, SCIENCE.Virologist: Ph.D. Eight years experience in both industrial andacademic research in virology, immunology and chemotherapy.Publications. Broad biological background. Administrative ex-perience. Available on agreement for permanent position. Box175A, SCIENCE.

Bacteriologist: Ph.D.; young woman; four years university in-structor with responsible teaching experience; varied researchprimarily in cancer field: immunochemistry, bacterial metabolism,vitamines. Research fellowship. Interested in research position,preferably with teaching. Box 183A, SCIENCE.

Director of Research available for appointment. Holds B.E., M.S.,Ph.D. degrees in metallurgy and M.S. degree in aeronautics (jetpropulsion major). Experienced in administration of researchand technical services. Box 184A, SCIENCE.

Entomolgist; Ph.D. in entomology, zoology, genetics; six years,teaching and supervisory principal public schools; two years, gradu-ate assistant, state university; six years, associate professor ofentomology, state university; for further information, please writeBurneice Larson, Director, Medical Bureau, Palmolive Building,Chicago 1 1.

BUSINESS OPPORTUNITIES

Science Book Business For Sale. Fine for young scientist orretiring professor. Continued sickness forces sale. Large up todate mailing list on address stencils. Stock mainly zoology,botany, geology. Buyer move right in, low rent, wonderful cli-mate; or move stock. Details on request; a reasonable offer ac-cepted. GUNTHORPS, 3510 Adams, San Diego 4, California.

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Personnel PlacementPOSITIONS OPEN

Bacteriologist: College graduate, some background in chemistry.Take charge of section in research project. Salary to $4,200.Box 178A, SCIENCE.

Bacteriologist-investigational work in pulp and paper fields in-volving bacteriological and mycological studies. Salary commen-surate with experience and ability. Give all details in first letter.The Institute of Paper Chemistry, Appleton, Wis.

Bacteriologist-Pharmacologist-Ph.D. degree. Ability to organ-ize and direct group on new anti-biotic research. MetropolitanNew York. Reply with full particulars. Box 177A, SCIENCE.

Capable young research chemist, Ph.D. Mature enough to act asgroup leader in a growing research institute connected with a largeeastern university. Must possess outstanding ability and person-ality, fine professional record and a few years of industrial researchexperience. May be given some opportunity to do graduate teach-ing. Give full statement of academic record, publications, researchexperience and salary required. Attach non-returnable small photo.Box 179A, SCIENCE.

Commercial Positions for entomologists, plant pathologists, phar-macologists, physicists, geologists, metallurgists. Chemical De-partment, POSITION SECURING BUREAU, INC. (Agency)45 John Street, New York, N. Y.

Director, Biochemical LaboratoryDesire recent Ph.D. in biochemistry with minor in organic chem-istry to head research group of four to six people investigatingenzyme systems, vitamins, amino acids and carbohydrates in Mid-west food industry. All correspondence confidential. Send com-plete information. Box 164A, SCIENCE.

Ph.D. in Pharmacology or Physiology-established ethical pharma-ceutical firm. Primary interests in pharmacological developmentof synthetic organic medicinals. Will assist in administration oflaboratory and supervision of technical staff. Must be able to in-terpret and clearly present experimental results and be capable ofinstituting sound experimental techniques. Complete personal,educational and professional resume requested. Box 167A,SCIENCE.

Assistant Mineralogist. Ward's Department of Mineralogy offersan excellent opportunity. Master's degree, teaching and field ex-perience desirable. Complete information regarding training andpractical experience requested. Write Ward's Natural ScienceEstablishment, Inc., P. 0. Box 24, Beechwood Station, Rochester9, N. Y.

Scientific Literature Researcher-for established Philadelphia ethi-cal pharmaceutical firm. Ph.D. or equivalent in pharmacologyor physiology-no foreign language required. Read scientificjournals to obtain information pertinent to company products andprojects, and ideas for new projects. Write literature reviews onassigned topics of interest to Research Division. Conduct specialliterature searches, answer technical questions, etc. Give personal,educational, professional background. Box 168A, SCIENCE.

Positions Open: (a) Ph.D. in immunology, pharmacology, physi-ology, or chemistry, or physician with background in experimentalmedicine and laboratory procedures to direct basic research inimmunology, pharmacology and chemistry related to problems inanaphylaxis, and allergy; rank: assistant professor of medicine orresearch associate; research laboratories, university medical school;$6,000-$7,000. (b) Physicist or electronic engineer; laboratoriesengaged in scientific research; work involves development oftheories and investigation of problems relative to sonar, radar,specialized electronics, sound, light. (c) Medical clinical pathol-ogfst whose major interest is hematology; large teaching hospital;consultation privileges permitted; East. (d) Biophysicist to as-sist in development and application of special equipment to beused in histochemical and cytochemical study of tumors; univer-sity medical school; Middle West. (e) Manuscript editor trainedand experienced in the fields of purely biological science; largepublishing company; opportunity for working into key position.(f) Two instructors in chemistry-one qualified in analytical workand the other in organic; Ph.D.'s required; liberal arts college;Southwest. (g) Biochemist trained and experienced in clinicalbiochemistry as applied to medical practice to bepome associatedwith eighteen-man clinic; Middle Western town of 50,000. (h)Instructor or assistant professor in anatomy; preferably one trainedin neuroanatomy who would be interested in research in this field;state university; Middle West. S1-5 Medical Bureau (BurneiceLarson, Director) Palmolive Building, Chicago 11.

Biology-Geology. College in Pacific Northwest will have anopening in fall in three-man department for one trained in geologyand biology, emphasizing field interests. Box 181A, SCIENCE.Physiologist: M.D. or Ph.D. for research in neurophysiology.Faculty appointment in eastern medical school. State researchand other experience, education, publications, etc. Box 182A,SCIENCE.

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The Market PlaceBOOKS

WANTED TO PURCHASE SCIENTIFIC BOOKSAND PERIODICALS

Entire libraries, and smaller collections; sets and runs;foreign and domestic.

WALTER J. JOHNSON,125 East 23rd Street, New York 10.

Journals, Periodicals, Learned and scientific serials bought andsold. Complete or part sets, back volumes. J. S. CANNER &COMPANY, INC., 909 Boylston Street, Boston 15, Massachu-setts.

Send us your Lists ofSCIENTIFIC BOOKS AND PERIODICALS

which you have for sale.Complete libraries; sets and runs; and single titles are wanted.

Also please send us your want lists.STECHERT-HAFNER, INC., 31 East 10th Street, New York 3.

JUST OFF THE PRESSIDVORINE COLOR DISCRIMINATION SCREENING TEST-a pseudo-isochromatic test that is 100% effective and instantane-ous. Excellent for doctors, schools and industries. Available intwo groups of charts, A and B. Each bound copy only $2.50.Israel Dvorine, OD, 2328 Eutaw Place, Dept. S, Baltimore 17,Maryland.Wanted: Full or partial sets-Journal of Biological Chemistry,Mathematical Reviews, American Mathematical Monthly, AmericanJournal of Science, Engineering Index, Journal of. Chemical So-ciety of London, Botanische Zeitung, Botanical Gazette, Journalof Botany, Annals of Botany, Chemical Abstracts; also majorbiological, chemical, mathematical periodicals. These are wantedfor institutional library. Premium rates will be paid. Pleasesend full details, whether bound, price.

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SUPPLIES AND EQUIPMENT

The Market PlaceSUPPLIES AND EQUIPMENT

All Amino Acids (natural and synthetic), rare sugars, biochemicalproducts and reagents, new pharmaceuticals in stock. Write forcomplete price list. BIOS LABORATORIES, 607 West 43rdStreet, New York 18.

Amino Acid and protein analysis by microbiologic methods. Hymdrolysate problems. SHANKMAN LABORATORIES, 2023South Santa Fe Ave., Los Angeles 21, California.

Crystalline Enzymes-salt free Chymotrypsin, Trypsin (ap. 50%MgSO4) and salt-free Ribonuclease. Also available, anti-fattyliver fractions (see Chaikoff et al. J. B. C. 155, 573, (1944)) andfractions having desoxyribonuclease activity.

WORTHINGTON BIOCHEMICAL LABORATORY,Freehold, New Jersey

Wanted: Microscope objective. Zeiss 40X, N. A. 0.75, WaterImmersion. Needed for microelectrophoretic work. Box 180A,SCIENCE.

Syrian Hamsters for Sale. Laboratory and breeding stock.Quantity rates. Live delivery guaranteed. Send stamp forreference list of informative publications.

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Pre-Mixed Microbiological Assay Media: Pure amino acids, aminoacid standards, biochemicals; consulting, analytical manufacturingchemists, precision analyses, microbiological assays for amino acidsand vitamins. H. M. CHEMICAL COMPANY, LTD., 144North Hayworth Avenue, Los Angeles 36, California.

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Index of Refraction Liquids for Immersion Meth-ods of Microseopy. Stable, non-volatile, certifiedliquids 1.400 to 1.700; high index liquids, above1.80 in preparation. Write for data S47-ND.

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THE JUNIOR GARCEAUELECTROENCEPHALOGRAH

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

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A A A S SYMPOSIA

A considerable fraction of the Symposium Volumes and Research Conferences publishedby the AAAS have been exhausted by orders.not only from libraries and from specialistsin their respective fields, but also from foreign libraries and scientists. The titles remain-ing in print are shown below with prices.

There are two new volumes. Approaches to Tumor Therapy, a comprehensive discussionby more than 60 participants, is now available. The Rikettsial Diseases of Man, a surveyof an important group of serious infectious diseases which have recently become importanthealth problems, will be published soon.

Title Prices

Members Non-members

LE Tuberculosis and Leprosy ............... $2.50 $3.00

a The Migration and Conservation of Salmon ................ 2.00 2.50

LI Blood, Heart and Circulation ............................ 3.00 4.25

[I Human Malaria ............................... 4.00 5.00

LI Liebig and After Liebig-A Century of Progress in AgriculturalChemistry ... .................. .... 2.50 3.00-

El Aerobiology ........... .. ... 3.50 4.00

[1 Relapsing Fever ..... 2.50 3.00

[1 Fluorine and Dental Health ... 2.50 3.00

L Mammary Tumors in Mice .... 3.50 4.00

LI The Chemistry and Physiology of Hormones .3.50 4.00[1 Dental Caries and Fluorine .. 3.00 3.50LI Approaches to Tumor Chemotherapy .... 6.50 7.75

7 '2 x 1 'I/2, double column, illustrated, cloth bound

Check volumes desired and send orders with correct remittance to:

Publications Division, AAAS1515 Massachusetts Avenue, N. W.Washington 5, D. C.

Please send me the Symposia volumes checked.

Name .......... Amount Enclosed $ ............

Address ............................... ................

City ...... ..... ... Zone .... State .

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