SCIENCE -ADVERTISEMENT 8 



NEW McQRAW=HILL BOOKS 



IMPORTANT DECEMBER ISSUES 

 PALfVlER — The Theory of Measurements 



By A. deFOREST PALMER, Ph.D., Associate Professor of Physics in Brown University. 

 248 pp. with Tables and Diagrams. S2.50 (10/6) net, postpaid. 



A thorough discussion of the principles underlying the precision of measurements, and the devel- 

 opment of suitable methods of measurement for special purposes. 



NORTHRUP— Methods of Measuring Electrical Resistance 



By EDWIN F. NORTHRUP, Ph.D. 389pp. Illus. $4.00 (17s) net, postpaid. 

 An authoritative treatise of value not only to physicists and teachers but to men in practice as 

 well. It describes and gives methods, sample measurements, details of instruments, etc. 



HAVARD — Refractories and Furnaces 



By F. T. HAVARD, E.M., Consulting Metallurgist, Goldsmith Bros.; Associate Professor of 



Metallurgy, University of Wisconsin. 356 pp. fully illus. $4.00 (17s) net, postpaid. 

 Based on a long experience in charge of furnaces in Germany, England and the United States. 

 Covers fully the preparation, properties, etc., of furnace materials. 



JANUARY PUBLICATIONS 

 HOBART — Design of Polyphase Generators and Motors 



By HENRY M. HOBART, M. Inst. C.E., Consulting Eng., G. E. Co. 265 pp. Illus. $3.00 

 (12/6) net, postpaid. Covers fundamental outlines, clearly and thoroughly. 



GRAY— Electrical Machine Design 



By ALEXANDER GRAY, Professor of Electrical Engineering, McGill University. 524 pp. 



6x9. 300 illus. 84.00 (17s) net, postpaid. 

 A textbook on both A.C. and D.C. machine design based on a practical plus a teaching experience. 



International Chemical Series 



HENRY P. TALBOT, Ph.D., Consulting Editor. 

 The books below whicli are the first in this series have had a gratifying reception. They are 

 distinctive volumes of high standard both in text and manufacture. 



NORRIS— The Principles of Organic Chemistry 



By JAMES F. NORRIS, Ph.D., Professor of Chemistry, Simmons College, Boston. 570 pp. 



51x8. Illustrated. $2.50 (10/6) net, postpaid. 



CADY — Inorganic Chemistry 



By HAMILTON PERKINS CADY, A.B., Ph.D., Professor of Chemistry, University of Kan- 

 sas. 629 pp., 5.5x8. Illustrated. $2.50 (10/6) net, postpaid. 



RECENT MINERALOGICAL AND GEOLOGICAL BOOKS 



ROGERS— study of Minerals 



A Combined Text Book and Pocket Manual 



By Austin Flint Rogers, Ph.D., Assoc. Prof. 

 Leland Stanford Univ. 522 pages, 5x7J. Flex- 

 ible leather. $3.50 (15s) net, postpaid. 

 Prof. Rogers' work has received the endorsement 

 of nearly all of the important schools of the 

 country. 



GUNTHER— The Examination of Pros- 

 pects 

 By C. Godfrey Qunther, E.H. 222 pages, 

 79 illus. Leather, $2.00 (8/4) net, postpaid. 



FARRELL & MOSES— Practical Field 

 Geology. 

 By J. H. Farrell, E.n., Mining Geologist. 

 A Guide to the Sight Recognition of 1 20 Common or 



Important Minerals 

 By Alfred J. Moses, E.M., Ph.D., Prof. 

 Columbia University. 271 pages, illustrated. 

 Leather. $2.50 (10/6) net, postpaid. 

 WElNSCHENK—PetrographicMethods 

 By E. Weinschenk. Trans, by Robt. W. 

 Clark, Instructorin Petrography, Univ. of Mich. 

 396 pp. 371 illus., $3 50 (15s) net, postpaid. 



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