THE DEVELOPMENT OF THE 
FROG’S EGG 
An Introduction to Experimental Embryology 
By THOMAS HUNT MORGAN, Ph.D. 
Professor of Biology in Bryn Mawr College 
Cloth 8vo $1.60 net 
“Professor Morgan’s book gives us a much-needed text-book 
for both student and instructor, and it should stimulate and 
greatly aid investigation by pointing out the wide field the frog’s 
egg still offers to embryological research.” 
— American Journal of Science. 
“A clear, succinct, and comprehensive account of all the 
known phases of the fertilization and development of the frog’s 
egg. ... That the statements are clear and intelligible as possi- 
ble, the reader may feel sure. ... The medical student should 
master it... . The general student or the reader who is inter- 
ested in the matter of the physical basis of heredity will find 
here the fundamental facts regarding the first beginnings of life 
and the structure of the egg as well as the sperm cell.” 
— The Independent. 
THE MACMILLAN COMPANY 
66 FIFTH AVENUE, NEW YORK 
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