





f^-H ,^iV-' 



^ 



fi 



c 



D 



E 



F 



Fig. 146. Photomicrographs of cleavage in living monkey eggs. (After Lewis and 

 Hartman, Carnegie Inst., Washington, Contrib. Embryol., 24.) (Figures borrowed from 

 fig. 33, Patten, '48.) (A) Late two-cell stage. (B) Early three-cell stage. (C) Late 

 four-cell stage. (D) Five-cell stage. (E) Six-cell stage. (F) Eight-cell stage; next 

 cleavage beginning. 



301 



