Important Wiley books for fall use.

CHEMICAL PROCESS PRINCIPLES-Part Il-ThermodynamicsBy 0. A. HOUGEN and K. M. WATSON, Professors of Chemical Engineering, Universityof Wisconsin.

Part II develops the fundamental principles of thermodynamics with particular emphasis on general-ized methods used for estimating thermodynamic properties from a minimum of experimental data.The authors also discuss application of these principles to problems dealing with the compression andexpansion of fluids, power generation, and refrigeration. Published in August.412 pages 5 by 88 $5.00

CHEMICAL PROCESS PRINCIPLES-Part Ill-Kineticsand Catalysis

By 0. A. HOUGEN and K. M. WATSON.Part III furnishes a comprehensive treatment of chemical kinetics applied to rector design for nearlyall types of reactions-homogeneous, heterogeneous, and catalytic. Temperature gradients andtransient phenomena are thoroughly covered. The authors give particular attention to interpretingpilot plant data and applying it to design problems. Ready in September.348 pages 5S by 88 $450

ELEMENTARY NUCLEAR THEORYBy H. A. BETHE, Professor of Physics, Cornell University.

This new book offers a study of nuclear forces, the central problem of nuclear physics. It is writtenas an introduction to basic theory-for students and scientists who are not specialists in the field.Dr. Bethe stresses the empiric point of view, with brief attention to theory which does not yet permituseful predictions. He discusses in detail beta disintegration and the behavior of the simplestnuclear systems. Ready in September.148 pages 5S by 8t Probable price, $2.25

FUNDAMENTALS OF ELECTRICITY AND MAGNETISMBy LEONARD B. LOEB, Professor of Physics, University of California.

The book opens with a treatment of magnetic phenomena, followed by the electromagnetic definitionof current and potential necessary. Much new material has been added to the third edition, dealingwith those aspects of atomic structure that the engineer must know. Recent developments in therealm of modern physics are thoroughly discussed. The gaussian system of units is used consistentlythroughout the book. Ready in September.Third Edition Approximately 657 pages 6 by 91 Probable price, $6.00

INTRODUCTION TO THE THEORY OF EQUATIONSBy LOIS W. GRIFFITHS, Associate Professor of Mathematics, Northeastern University.

Designed for students with a background of elementary work in plane trigonometry, plane analyticgeometry, and differential calculus. The book is an introduction to the theory of equations, determi-nants, and matrices. Restatement, detailed explanatory phrases, references to equations andtheorems, and summaries aid the student in mastering difficult proofs. Development is from theparticular to the general. Published in June.Second Edition 264 pages 5. by 81 $3.50

John Wiley & Sons, Inc., 440-4th Ave., New York 16, N. Y.

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Recognizing the need for a specific discussion of coating and ink resins, the author has devoted his newbook to those resin types which are now in common use and with which he is in daily contact throughdevelopment and production work. The discussion is confined to light colored, hard, soluble and high vis-cosity groups of phenolic, maleic and copal type synthetics, all of which show interesting chemical reactivitieswhen incorporated into surface coatings and printing inks. The book endeavors to supply the theoretical back-ground of the chemistry and physics of the resinous materials, as far as such conceptions can be supported byexperimental evidence. Wherever possible, simple experiments and determinations have been designed tointerpret certain reactivities, and special emphasis is laid on a detailed description of methods of chemicalanalysis useful in resin technology.

Contents include: Technological Aspects of Resin Strudure and Reactiity. 1. Coating and Ink ResinsGenerally. 2. Phenolic Resins. 3. Malic Resins. 4. Copal-Type Synthetics; Technological Views on ResinProperties; Characteristics of Resin-Oil Films; Practical Viewpoints on Resin Application; Machinery andEquipment; The Patent Situation.335 Pages Illustrated with 8 color plates, and many halftones .7.00

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DISEASES OF FIELD CROPSBy James G. Dickson, University of Wisconsin. MlcGraw-Hill Publications in the Agricultural Sciences.411 pages, *4.60

a Represents a complete revision and expansion of the author's privately printed Outline of Diseases ofCereal and Forage Crop Plants of the Northern Part of the U. S. The present book combines the pertinenthistory and current information on the diseases of the more important field crop plants.

RADAR AIDS TO NAVIGATIONEdited by John S. Hall, Amherst College. Vol. 2 in the Massachusetts Institute of Technology Radi-ation Laboratory Series. OSRD-NDRC. 416 pages, *5.00

a Points out in nontechnical terms the advantages and limitations of various types of radar as aids in thesolution of problems encountered in navigation and pilotage. These types of radar include airborne,shipborne and ground-based systems. Radar beacons and other auxiliary equipment are also discussed.

TECHNIQUE OF MICROWAVE MEASUREMENTSEdited by Carol G. Montgomery, Yale University. Vol. 11 in the Massachusetts Institute of TechnologyRadiation Laboratory Series. OSRD-NDRC. 978 pages, *10.00Describes in detail the procedures for measuring the properties of microwaves and the circuits in whichthey are used. Among the topics are sources of power suitable for measuring purposes, means of detect-ing energy at microwave frequencies, standing-wave measurements, determination of impedance,measurement of wavelength and frequency, etc.

MECHANICS. 297pages,$4.00ELECTROMAGNETISM. 245pages,$3.50

By John C. Slater and Nathaniel H. Frank, Massachusetts Institute of Technology. International Series inPure and Applied Physics;These two books represent a revision and extension of those portions of the authors' well-known Intro-duction to Theoretical Physics, rearranged and modified in such a way that each volume is suitable for a

term's course. Most of the mathematical material has been put in the appendixes; explanations are

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POSITIONS WANTED

The California Medical Bureau, Agency for scientific and laypersonnel inmedicine, biology, chemistry, physics and allied sciences, supplies teachers,research workers, laboratory dieners, skilled office help. Prompt service.Registration free. Your patronage respectfully solicited. THE CA~wOa-NIA MEDICAL BUREAU, Agency, Arcade Medical Center. 696 ColoradoStreet, Pasadena 1, California.

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Bailey's MAMMALS OF VIRGINIA, 432 pages 99 illustrations, 1946. 130kinds recent mammals-man, domestic and wild mammals. List of fossils.Bibliography 758 titles Only publication devoted to Virginia zoology$5.00. John Wendell Bailey, 27 Willway Road, Richmond 21, Virginia

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Mavor:GENERALBIOLOGY

Third Edition

Written in a clear simple style and main-taining a logical arrangement of material,the new edition of this widely popular text

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