The Role of the Pituitary Gonadotropins 7 



preparation which is less potent and more contaminated with ICSH than 

 the gonadotropin used in estabhshing the standard conditions described here. 

 The FSH used in determining standard conditions was made in 1939 and is 

 comparable in method and preparation and potency to that listed as the 

 first item in Table 6. 



Table 6. Comparison of Follicle-stimulating Hormone (FSH) Preparations from 

 Sheep Pituitary made in Different Laboratories (after Simpson, 21) 



Table 7. Effect of Further Purification of FSH on Its Ability to Induce Ovulation 

 in Hypophysectomized Rats, under Standard Conditions of Dosage and Timing 



