SCIENCE 



NbW SeKIES -r, „ ■ n 1 r^r,r, ANNTTAL SUBSCKIPnON, $6.00 



Vol. lvi, No. 1458 Friday, December 8, 1922 Single Copies, 15 Cts. 



ew Blakiston Books 



Third 

 Edition 



FOLSOM^S ENTOMOLOGY 



With Reference to Its Ecological Aspects 



The book will cover the growing demand for a biological treat- 

 ment of entomology, and is planned for use as a text and also for 

 the general reader. This edition has been brought up to date 

 by inclusion of much new material and some new illustrations. 

 A chapter on Insect Ecology has been added. 



By Justus Watson Folsom, Sc.D., (Harvard), Assistant Professor of En- 

 tomology, University of Illinois. 



3rd Edition. 313 Illustrations. Cloth, $4.00 



Fourth 

 Edition 



GALLOWAY'S ZOOLOGY 



A Textbook for Universities, Colleges and Normal Schools 



This text is founded upon definite principles that will secure 

 good interest and fine spirit. The new edition marks the prog- 

 ress in the science as it pertains to the instruction of beginners. 

 Greater accuracy of detail has been accomplished. 



By Thomas Walton Galloway, Ph.D., Litt. D. Formei'ly Professor of Zoology, 

 Beloit College, (Wisconsin). With assistance of Paul S. Welch, Ph.D., 

 Associate Professor of Zoology, University of Michigan. 



4th Edition. 255 Illustrations. Cloth, $2.75. 



P. BLAKiSTON'S SON &. CO. 



Publishers Philadelphia | 





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