

A TREATISE 



OX 



CL.ZL 





COMPARATIVE EMBRYOLOGY 



BY 



FRANCIS M. BALFOUR, LL.D., F.R.S., 



FELLOW AND LECTURER OF TRINITY COLLEGE, CAMBRIDGE. 



IN TWO VOLUMES. 



VOL. II. 



MACMILLAN AND CO. 



1881 



[Tlie Right of Translation is reserved. 



