A TREATISE 



ON 



COMPAEATIVE EMBBYOLOGY 



BY 



FEANCIS M. BALFOU.R, M.A., F.E.S., 



FELLOW AND LECTURER OF TRINITY COLLEGE, CAMBRIDGE. 



IN TWO VOLUMES. 



VOL. I. 



MACMILLAN AND CO. 



1880 



[The Right of Translation is reserved.] 



