ON AGRICULTURE 



Mr. Harwood's new book The New Earth 



By W. S. HARWOOD, Author of "New Creations in Plant Life," is a recital of the triumphs of 

 modern agriculture in America, of which The Independent says: " Mr. Harwood has done a great 

 service . . . His book should be put at once into all the country libraries." 



Illustrated. Cloth, fl.75 net; by mail $1.89 



Professor L. H. Bailey's Plant~ Breeding fourth edition 



is entirely revised with the addition of a new chapter on current practice. The New York Evening 

 Post says: "We leave the book with the very strongest nssurance to our readers that any enterpris- 

 ing nature-lover will find it intensely interesting and valuable." 



lllustruted. Cloth, 331, pp., $1.00 net ; by mail $1.11 



ON ASTRONOMY 



Dr. Newcomb's A Compendium of Spherical Astronomy 



With Its Applications to the Determination and Reduction of Positions of the Fixed Stars. By 

 SIMON NEWCOMB hhk pp., 8vo, cloth, $3.00 net ; by mail $3.20 



Mr. Forest R. Moulton's An Introduction to Astronomy 



By FOREST RAY MOULTON, Ph.D., University of Chicago; Author of "An Introduction to Celes- 

 tial Mechanics." Illustrated. 18+557 pp., 8vo, cloth, $1.25 net ; by mail $1.37 



ON BIOLOGY, NATURAL HISTORY, ETC. 



Dr. Samuel J. Holmes's The Biology of the Frog 



is an easily followed, narrative discussion of the complete life-structure of the frog. 



Illustrated, cloth, 12mo, $1.60 net ; by mail, $1.71, 



Dr. Ernest IngersolPs The Life of Animals — Mammals 



By the author of "Wild Neighbors," "An Island in the Air," etc. The New York Sun says: "No 

 better book can be put into the hands of a boy tnat is interested in animals." 



Illustrated with colored plates and many drawings. 555 pp., $2.00 net ; by mail $2.21, 



Dr. Jacques Loeb's Dynamics of Living Matter 



has attracted widespread interest from the originality of his ideas and the importance of their 

 Bubject. Cloth, 8vo, $3.00 net; by mail $2.23 



Columbia University Biological Series 



Prof. H. S. Jennings's Behavior of the Lower Organisms 



A new volume in the Columbia University Biological Series, edited by HENR\ F. OSBORV and 

 EDMUND B. WILSON. 366 pages with about 150 figures in the text. $3.00 net; by mail, $3.20 



ON ENGINEERING 



Stevens & Hobart's Steam Turbine Engineering 



is written from the standpoint of buyer and the user ; it deals with questions of economy in first 

 cost, maintenance and steam consumption, as well as with tbeory and design. 



blUpp., 516 illustrations. $6.50 net ; by mail $6.80 



Mr. Parr's Electrical Engineering in \ heory and Practice 



By G. D. ASPINALL PARR, M.Sc, M.I.E.E., A.M.I., Mech.E., Head of the ElectricalEngineering 

 Department, the University, Leeds. With 282 illustrations. 



Cloth, 8vo, 447 pp., $3.25 net ; by mail $3.50 



OTHER BOOKS OF SCIENTIFIC INTEREST 



Professor Hallock's Outlines of the Evolution of 

 Weights and Measures and the Metric System 



By WILLIAM HALLOCK, Ph. D., Professor of Physies in Columbia University in the City of New 

 York, and HERBERT T. WADE, Editor for Physics and Applied Science, The New International 

 Encyclopaedia. Cloth, 8vo, SOS pp., $2.25 net ; by mail $2.i0 



Professor Major's First Steps in Mental Growth 



By DAVID R. MAJOR, Ph.D., Professor of Education in Ohio State University, is a series of studies 

 in the Psychology of Infancy. U+360pp., 12mo, illustrated, $1.25 net ; by mail $1.S7 



published THE MAC MILLAN COMPANY "l^™™ 1 " 



