THE PCETAL 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 fi 

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

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

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



