SCIENCE 



New Series Frtiiav Tt-xtt? Q 1 Q'T7 Single Copies, 15 Cts. 



Vol. LV, No. 1432 r kiuai, d ljS-L J, IJ^^ Annual Subscription, $6.00 



Some Blakiston Textbooks 



PATTEN. Early Embryology of the Chick 



By Bradley M. Patten^ Assistant Professor of Histology and Embryology, Western Re- 

 serve University. SS Illustrations. Cloth, $2.25. 

 It is a brief, uncomplicated guide to the study of early developmental processes. 



WILDER. Laboratory Manual of Anthropometry 



By Harris H. Wilder, Professor of Zoology, Smith College. 43 Illustrations. Cloth, $3.00. 

 It gives rules for measurements ; enumeration of instruments ; mathematical methods for 

 tabulating and expressing results of measurements ; bibliography ; appendices with measure- 

 ments for comparison, etc. 



ATWOOD. Civic and Economic Biology 



By Wm. H. Atvvood, Milwaukee State Normal School. 364 Illustrations. Cloth, $1.68. 



The subject is arranged in units and studies, each study of proper length for a single class 



lesson; it is inspiring and most teachable. 



CHAMBERLAIN. Textbook of Organic Chemistry 



By Joseph Scudder Chamberlain, Professor of Organic Chemistry, Massachusetts Agri- 

 cultural College. Cloth, $4.00. 

 An improved, modern textbook of organic chemistry. 



DUFF. A Textbook of Physics Z^^jJoT 



By Various Writers ; Edited by A. Wilmer Duff, Professor of PhysiiWiaWorcester Poly- 

 technic Institute. 6og Illustrations. Cloth, $4.00. / ...... . .- 



The authors have aimed at clearness and accuracy. They present the ''Sompiyte' subject in 

 attractive manner. . \ 



TOWER, SMITH, TURTON, COPE. Physics %£.ial Mr. . 



By Willis E. Tower, Englewood High School, Chicago; Charles H. SImith, Hyde Park 

 High School, Chicago ; Charles M. Turton, Bowen High School, Chicago, and Thomas' D. 

 Cope, University of Pennsylvania. 455 Illustrations. Cloth, $1.35. 



WILLIS. Plane Geometry 



By Professor C. Addison Willis, Girard College, Philadelphia. 473 Illustrations. Cloth, $1.32. 

 "A complete unified course pulsating with life and aggressiveness." 



NEELY AND KILLIUS, Modern Applied Arithmetic 



By R. R. Neely, Supervisor Part Time Schools, Peoria, Illinois, and James Killius, Director 

 Vocational Education, Johnstown, Pennsylvania. Cloth, $1.00. 



Deals with real life situations, and gives personal, social, civic, commercial, industrial, sci- 

 entific applications. 



P. BLAKISTON'S SON & CO., Publishers: PHILADELPHIA 



