PRINCIPLES OF 

 EMBRYOLOGY 



BY 



C. H. WADDINGTON 



SC.D., F.R.S. 



Professor of Animal Genetics 

 University of Edinburgh 



vJSo 

 I ISC 



WITH .186 FIGURES 



^tmmmm-^ 





LIBRARY 



WOOOS HOLE, MASS. 

 W. H. 0. I. 



NEW YORK 



THE MACMILLAN COMPANY 





