r^ 



D 



y 



Fig. 17. — The potentiation of the response of ovaries of littermate rats as a 

 result of the addition of "Merthiolate" to the pituitary gonadotropic extract in- 

 jected. The rats were 26 days old at death and weighed 68 gm., except D, which 

 weighed 54 gm. (From Chen and van Dyke, J. Pharmacol, exp. Therap., 62, 



333-4S [1938].) 



