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Fig. 375. Implantation in human and monkey. Trophoblastic ectoderm shown in com- 

 plete black in the following diagrams. (A) Human about 71/2 days. Blastocyst almost 

 completely inside of the endometrium. (B) Human about 11 days. Blastocyst within 

 endometrium. Trophoblast enlarging. (C) Human about 12 days. (D) Condition of 

 human embryonic vesicle at about 13-15 days. Observe enormous thickening of tropho- 



919 



