326 INTERNAL SECRETIONS 



ovaries from which the corpora lutea had been excised. 

 Herrmann concludes from his experiments that the corpus 

 luteum and the placenta contain a substance which can excite 

 the development of the genital organs and mammary glands. 

 Herrmann (19 17) has employed his extracts in cases of 



Circular muscle layer 

 Mucosa 



f \ 





Glands ~_,r>-=^ 



Circ. muscle layer — 



Longitud. m. layer -^^ 



Fig. 123. — Influence of extracts of corpus luteum on the uterus. — From Herr- 

 mann. 



A. Uterus of a rabbit 8 weeks old. Normal, x 22. 



B. After 3 injections, x 22. 



haemorrhage of ovarian origin and found that there were 

 good results in 95 per cent, of 73 cases after injection of ex- 

 tracts of the corpus luteum or placenta. His paper may be 

 consulted for details of the cases. 



We have already mentioned that the influence of the extract 

 was observed also on the mammary glands of male rabbits. 

 This shows that the extract of the ovary or of certain parts 



