THE CHORION1C VILLI. 



347 



FIG. 202. ISOLATED TERMINAL BRANCH OK A 

 VILI.US FROM A HUMAN CHORION OF TWELVE 

 WEEKS. 



FIG. 203. VILLOUS STEM FROM A HUMAN PLA- 

 CENTA OF THE FIFTH MONTH. X 9 diams. 



XI9 



FIG. 204. TERMINAL BRANCHES OF A VILLUS FROM A 



HUMAN PLACENTA AT FULL TERM. 



The little spots indicate proliferation islands of the covering 

 epithelium. Magnified. 



FIG. 205. PORTION OF AN INJECTED VIL- 

 LUS FROM A PLACENTA OF ABOUT FIVE 

 MONTHS. X 2I diams. 



