Diseases of Poultry : Etiology, Diagnosis, 

 Treatment, and Prevention 



BY RAYMOND PEARL, FRANK M. SURFACE, 

 AND MAYNIE R. CURTIS 



Illustrated, cloth, I2mo 



This book gives a comprehensive survey of the present state of knowl- 

 edge regarding the diseases of poultry. The point of view of the practical 

 poultry raiser is emphasized throughout. To the average man the chief 

 points of interest about disease are three : its recognition, its cure, if such 

 be possible, and its prevention in the future. These are the matters on 

 which stress is laid in this volume. Entirely original and outstanding fea- 

 tures of the treatise are : (a) the discussion of hygiene and sanitation, 

 (<5) the tables for aiding in the diagnosis of disease both from external 

 symptoms and post-mortem findings, (c ) the thorough analysis of the liter- 

 ature of the subject, (*/) the wide first-hand experience of the authors 

 with the subject. Nearly every disease mentioned has been observed by 

 the authors directly in their work at the Maine Agricultural Experiment 

 Station. 



The Germ-Cell Cycle in Animals 



BY ROBERT W. HEGNER 



Assistant Professor of Zoology in the University of Michigan, author of "An 

 Introduction to Zoology/' and " College Zoology." New York, 1914. 



346 pages, ill., ismo, 



An excellent survey of a subject which is extremely important to all 

 biologists and a book available for use as a supplementary text in courses 

 on Cellular Biology, Evolution, Heredity, and Genetics. The term " Germ- 

 Cell Cycle " is meant to include all those phenomena concerned with the 

 origin and history of the germ cells from one generation to the next gen- 

 eration. Contrary to the usual custom, the period of the germ-cell cycle 

 which is emphasized in this book is not the maturation of the germ cells, 

 but the segregation of the germ cells in the developing egg and the visible 

 substances (keimbahn-determinants) concerned in this process. While 

 the author's treatment is technical, he has presented the data available in 

 such a clear way as to make them intelligible to those who have not been 

 able to follow in detail the progress of cytology during the past few years. 



THE MACMILLAN COMPANY 



Publishers 64-66 Fifth Avenue New York 



