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West Washington Square Philadelphia 



London : 9, Henrietta Street, Covent Garden 



Economic Zoology. By L. S. DAUGHERTY, M. S., Ph. D., Professor 

 of Zoology, State Normal School, Kirksville, Mo.; and M. C. 

 DAUGHERTY. Part I Field and Laboratory Guide: 12 mo of 237 

 pages, interleaved. Cloth, $1.25 net. Part II Principles: I2mo 

 of 406 pages, illustrated. Cloth, $2.00 net. 



There is no other book just like this. Not only does it give the salient 

 facts of structural zoology and the development of the various branches, 

 but also the natural history the life and habits. It emphasizes the 

 economic phase throughout, showing the beneficial or harmful tenden- 

 cies of each animal in the life of man. The illustrations are helpful. 



Prof. V. E. Shelf ord, University of Chicago: " It has many merits and 

 is the best book of the kind on the market." 



Nutritional Physiology. By PERCY G. STILES, Assistant Pro- 

 fessor of Physiology in Simmons College ; Instructor in Physiology 

 and Personal Hygiene in the Massachusetts Institute of Tech- 

 nology, Boston. jarno of 271 pages, illustrated. Cloth, $1.25 net. 



Dr. Stiles' new work expresses the most advanced views on this im- 

 portant subject. It takes up each organ, each secretion concerned 

 with the process of digestion, discussing the part each plays in the 

 physiology of nutrition in the transformation of energy. In fact, 

 the keynote of the book throughout is "energy" its source and its 

 conservation. The illustrations and homely similes are noteworthy. 

 Prof. M. E. Jaffa, University of California: " The presentation of the 

 matter is excellent and can be understood by all." 



