. 



A TREATISE 





COMPARATIVE EMBR\uu)GY 



BY 



FRANCIS M. BALFOUR, M.A., F.R.S.. 



FELLOW OF TRINITY COLLEGE, CAMBRIDGE, 

 \M> PROFESSOR OF ANIMAL MORPHOLOGY IN THE V* 



IN TWO VOLUMES. 

 VOL. I. 



SECOND EDITION. 

 REPRINTED WITHOUT ALTERATION fKOM THE F//fS7 



U.ontjon : 

 MACMILLAN AND CO. 



1885 



[ Th< Kigkl of Tnuulmtw* it rtttrvtJ.] 



