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. 



34.6 pages, ill., 12mo, $1.75 



An excellent survey of a subject which is ex- 

 tremely 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 con- 

 cerned with the origin and history of the germ 

 cells from one generation to the next generation. 

 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 de- 

 veloping egg and the visible substances (keim- 

 bahn-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 



