THE FCETAL MEMBRANES OF MAN. 



255 



months one still finds all cavities up to the mouth of the glands 

 lined with a thin layer of cubical or flat epithelial cells. 



Likewise in the first stage there occurs in the inter-glandular 



tissue an active process of growth, especially in the upper compact 

 layer. In this there are formed spheroidal structures, 30 to 40 /x 

 in diameter, which have been called decidual cells by FRIEDLANDER. 

 In many places they lie so close together that, as a consequence 

 and because of their form, they appear very similar to an epithelium. 



