Sethe 
NEw SERIES / D SinaLE Copizs, 15 Crs. 
Vou. XXXV. No, 909 Fripay, May 31, 1912 ANNUAL SUBSCRIPTION, $5.00 
Daugherty’s 
Economic Zoology 
This is by far the most practical work on Zoology ever published. There is no other 
book just like it. Not only does it give the salient facts of structural zoology and 
the development of the various branches of animals, but also the natural history—the 
life and habits—thus showing the interrelations of structure, habit and environment. 
In a word, it gives the principles of zoology, and their actual application. The eco- 
nomic phase is emphasized in every branch. 
The work is the direct result of some fourteen years’ experience in classroom and 
laboratory work. Every statement has been carefully weighed and tested as to its 
correctness. There is a profusion of illustrations, all extremely instructive. 
By L. 8. DaucHERTY, M.S., Ph.D., Professor of Zoology, State Normal School, Kirksville, Mo.; 
and M. C. DauGHERTY, author with Jackson of “ Agriculture through the Laboratory and School 
Garden.’’ 12mo of 350 pages, illustrated. 
Professor Drew’s work is designed for practical use in the laboratory. Its purpose VAT 
is twofold : To give the student a working knowledge of comparative anatomy and 
to lead him toan appreciation of the adaptation of the animals to theirenvironments. ~/"9;: 
It is a practical work, expressing the practical knowledge gained through experience. 
The type method of study has been followed. Professor Drew’s long connection with 
the Marine Biological Laboratory at Woods Holl, Mass., has especially fitted him for 
writing a practical boox. 
By GiLtmaNn A. DEEw, Ph.D., Professor of Biology, University of Maine. 12moof 201 pages. 
Cloth, $1.25 net. 
MEDICAL AND 
McFarland’s Biology GENERAL 
This work is particularly well adapted to the requirements of scientific courses. It 
takes up living substance generally, illustrating the text whenever a picture will 
help. There are chapters on the origin of life and its manifestations, the cell and cell 
division, reproduction, ontogenesis, conformity to type, divergence, structural and 
blood relationship, parasitism, mutilation and regeneration, grafting, senescence, etc. 
12mo of 440 pages, with 160 illustrations. By JosErpH McFARLAND, M.D., Professor of Pathology 
and Bacteriology, Medico-Chirurgieal College of Philadelphia. Cloth, $1.75 net. 
W. B. SAUNDERS COMPANY, Philadelphia and London 
Drew’s Invertebrate Zoology Laser 
