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 mail the magazine* and it will be placed la the 

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SCIENCE 



vo': l"x" NO. .M Fkiday. January 10, 1919 ^^.^bL^.™ ,».« 



Three New Blakiston Books 



HOLMES 



THE ELE/V\ENTS OF ANIHAL BIOLOGY 

 By S. J. HOLMES, Ph.D. 



Professor of Zoology, University of California 



With 249 Illustrations, x + Jfi2 pages 



An introduction to the elements of animal biology for h'gh school students. It presents a living 

 subject in a live manner and ^vill hold the interest of both pupU and teacher. 



As a preparation for the study of physiology the book will serve admirably. Special attention 

 is given to the role of ba' teria in causing disease, and to the way in which diseases are spread and 

 how they may be avoided. 



REESE 



OUTLINES OF ECONOMIC ZOOLOGY 



By ALBERT N\. REESE, Ph.D. / 



Professor of Zoologj', West Virginia University I - 



Thoroughly Illustrated, Nearly Ready \ 



This volume makes the economic aspect of the subject the main point of attack, with morphology, 

 habits, etc., secondarj-. It will be found, therefore, to differ from most so-called "economic zoologies." 



The book is adaptable for use in a beginning course, or as a separate course for students who 

 have already had the regular elementary course in general zoologj'. It would also be of value for 

 supplementary reading or for use of students in agriciilture who want a "practieal" course. 



LOCH HEAD 



ECONOMIC ENTOMOLOGY 

 By PROFESSOR W. LOCH HEAD 



Professor of Biology, Macdonald College, Quebec, Canada 



Illustrated. Nearly Ready 



A class-book on the various methods of fighting insects embracing a study of the structure, 

 habits and life-histories of the injurious insci ts and their relations to all natural and artificial condi- 

 tions to which they may be subjected, including the investigation of the nature of their losses and 

 the practii able means bj- whi' h they roaj' be prevented or lessened. 



P. BLAKISTON'S SON & CO. 



PUBLISHERS 1012 WALNUT ST., PHILADELPHIA 







.5' 



jA 



