C. H. WADDINGTON 



How Animals Develop 



A SHORT ACCOUNT OF THE SCIENCE OF EMBRYOLOGY 



"The book may be confidently recommended to medical and scientific 

 students as well as to the general reader who wishes to obtain an 

 up-to-date survey of the modern science of experimental embryology. 

 It is the first book of its kind, at any rate in English, to present authori- 

 tatively in simple elementary language an outline of the way in which 

 animals develop and the causes which underlie the processes of 

 embryonic differentiation."— f. h. a. Marshall, Nature 



''Mr. Waddington's book makes very good reading and gives a clear 

 though necessarily simplified, account of his subject ... For the student 

 this book will provide a stimulating introduction."— Lancet 



"If one has some preliminary understanding of zoology and of scien- 

 tific methods, and an interest in the subject, Mr. Waddington's book 

 will provide some fascinated hours. And it has much value as an 

 account and summing up of the present status of embryology."— 

 The New York Times 



HARPER & BROTHERS, NEW YORK 



COVER DESIGN BY GUY FLEMING 



