THE CHORIONIC VILLI. 



369 



X 19 



FIG. 2^6. ISOLATED TERMINAL BRANCH OF A 

 VlLLTJS FROM A HUMAN CHORION OF TWELVE 



WEEKS. 



FIG. 247. VILLOUS STEM FROM A HUMAN PLA- 

 CENTA OF THE FIFTH MONTH. X 9 diams. 



Xl9 



FIG. 248. TERMINAL BRANCHES OF A VILLUS FROM A FIG. 249. PORTION OF AN INJECTED VILLXJS 



HUMAN PLACENTA AT FULL TERM. FROM A PLACENTA OF ABOUT FIVE MONTHS. 



The little spots indicate proliferation islands of the X 210 diams. 

 covering epithelium. 



24 



