326 Mammary Growth After Hypophysectomy 



B. Incomplete lobulo-alveolar growth after: 



(1) 60 I.U. of purified lactogenic hormone plus 10 I.U. of estrone and 

 1-2 I.U. of progesterone (barely positive) 



(2) 5 mg. of the crude lactogenic extract plus 10 I.U. of estrone and 

 1-2 I.U. of progesterone (definitely positive) 



III. Normal 60-70-day-old female rats injected for ten days with 60 I.U. of 



purified lactogenic hormone daily showed complete lobulo-alveolar mammary 



development. 



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