FOETAL NUTRITION: THE PLACENTA 405 



also been described in the tropboblast of the rabbit by 

 Beneden, and in the uterine mucosa by Schmidt,^ who stated 



Fie. 93. — First stage of cellular secretion in the placenta of the cow. 

 Invagination of glandular epithelium and some of the underlying con- 

 nective tissue. (From Kolster, "Die Embryotrophe placentarer Sanger," 

 Annt. Hefte, vols, xviii. and xix., 1902-3.) 



that they were composed of calcium oxalate. In Ruminants 



they are found in enormous numbers, but whether they form 



' Quoted by Bonnet, " Ueber Embryotrophe," AffincA. med. Woch., 1899. 



