212 Discussions 



that it was possible to inhibit the effect of FSH on the ovaries by simultaneously 

 administering progesterone (100 mg/day, intramuscularly). However, later experiments 

 have shown that it is possible to obtain an increase in estrogen excretion with no 

 change in ovarian size. The urinary excretion of estrogen following FSH plus 

 progesterone is much lower than following the administration of FSH alone. These 

 experiments are going on at the present time and I hope to be able to report on them at a 

 later occasion. 



