SCIENCE.— AD VERTISEMENTS. 



Macmillan & Co.'s New Books in Science. 



Lens-Work for Amateurs. 



By Henky Oefoed, author of 'Modern Optical 

 Instruments.' A Microscope Objective, etc. 231 Il- 

 lustrations. 12mo, Cloth, 80 cents. 



Steel Works Analysis. 



(The Specialists' Series), by J. O. Arnold, F. C. S., 

 Professor of Metallurgy at the Sheffield Technical 

 School, etc. 12mo, Cloth, $3.00. 



"Written especiallj' for assistants in Steel Works 

 Laboratories and Students taking up the analytical 

 chemistry of iron and steel with a view of becoming 

 steel works chemists. ' ' 



flodel Engine Construction. 



With Practical Instructions to Artificers and Ama^ 

 .teurs. By J. Alexander. With Working Draw- 

 ings and other Illustrations, &c. 12mo, Cloth, §3.00. 



The Theory of Sound. 



By Lord Eayleigh, So. D., F. E. S., etc., in 2 

 vols. Vol. 1. Second Edition, Eevised and En- 

 larged, 8vo, Cloth §4. 



Electrical Papers. 



By Oliver Heaviside. 2 vols., 8vo, Cloth, §7.00. 



A Treatise on the fleasurement of Elec= 



trical Resistance. 



By Wm. Arthur Price, M. A., A. M. I. C. E. Svo, 

 Qoth, §3.50. 



Elementary Lessons in Electricity and 

 Magnetism. 



By Sylvanus P. Thompson, D.Sc, B.A., F.E.A.S., 

 Principal of the City and Guilds of London Technical 

 College, Finsbury. New, Eevised Edition, with many 

 Additions. With numerous Illustrations. 12mo, 

 $1.40, net. 



Lectures on Human and Animal Psy° 

 chology. 



Translated from the Second and Eevised German 

 Edition (1892) by J. E. Creighton, A.B. (Dalhou- 

 sie), Ph.D. (Cornell), and E. B. Titohener, A.B. 

 (Oxon.), Ph.D. (Leipzig). Svo, Qoth, §4.00, net. 



Popular Lectures and Addresses. 



By Lord KEL-snN, F.E.S. In 3 vols. Vol. II. 

 Qeology and Qeneral Physics. With Illustra- 

 tions. Crown Svo. §2.00 each volume. 



A Treatise on the Measurement of Elec= 

 trical Resistance. 



By William Arthur Price, M.A., A.M.I.C.E., 

 formerly Scholar of New College, Oxford. Svo, Cloth, 

 $3.50, net. 



A Laboratory Manual of Physics and 

 Applied Electricity. 



Arranged and Edited by Edward L. Nichols, 

 Professor of Physics in Cornell University. In two 

 vols. Vol. I. Junior Course in Qeneral Physics. 

 By Ernest Mereitt and Frederick J. Eogers. 

 Svo, Cloth, §3.00, net. Vol. II. Senior Courses 

 and Outlines of Advanced Work. By George 

 S. Molee, Frederick Bedell, Hojier J. Hotch- 

 Kiss, Charles P. Matthews, and the Editor. 

 Illustrated. Svo, Cloth, §3.25, net. 



" The needs of those who are id training to become electri- 

 cians have been specially considered Is admirably 



adapted for use as a text-book by students who have already 

 some knowledge of the technique of physical work."^^co?s- 

 man. 



Manual of Physico=Chemical fleasure- 

 ments. 



By Wilhelm Ostwald, Professor of Chemistry in 

 the University of Leipzig. Translated, with the 

 Author's sanction, by James Walker, D.Sc, Ph.D., 

 Assistant in the Chemical Laboratory, University of 

 Edinburgh. lUustrated. Svo, Cloth, §2.25, net. 



Cambridge Natural Science flanuals. 

 Biological Series. Practical Physi- 

 ology of Plants. 



By Francis Darvfin, M.A., F.E.S., and E. Ham- 

 ilton Acton, M.A. With Illustrations. 12mo, 

 Cloth, §1.60, nH. 



Columbia University Biological Series. 



Edited by Henry Fairfield Osboen, Sc.D., Da 

 Costa Professor of Biology in Columbia College. The 

 volumes of the series already published are as follows: 



1. From the Greeks to Darwin. By Henry 

 Fairfield Osborn, So.D. Svo, Buckram, 

 §2.00, net. 



I!. Amphioxus and the Ancestry of the Ver- 

 tebrates. By Arthur Willey, B.Sc, 

 Tutor in Biology, Columbia College. With 

 a Preface by the Editor. With ninstrations. 

 Svo, Buckram, §2.50, net. 



The Rise and Development of Organic 

 Chemistry. 



By Carl Schorlemmer, LL.D., F.E.S. Revised 

 Edition, edited by Arthur Sjhthells, B.Sc. 

 12mo, Cloth, §1.60, net. 



Essays in Historical Chemistry, 



By T. E. Thorpe, F.E.S., Professor of Chemistry 

 in the Eoyal CoUege of Science, South Kensington, 

 London. Svo, Cloth, §2.25, net. 



MACMILLAN & CO., 66 FIFTH AVENUE, NEW YORK. 



