Fig. 67 

 A cat early blastocyst. X 550. (Bouin; Wcigcrt H and E.) 

 (E. C. Amoroso.) 



Fig. 68 

 A cat blastocyst at a later stage, after differentiation of the endoderm. 

 X 450. (Bouin; Weigcrt H andE.) (E. C. Amoroso.) 



