§ 5 SUMMARY 141 



ture they are independent of the testis and of the secondary 

 sexual characteristics. This is expressed in the formation of 

 corpora lutea and in the response thereto on the part of the 

 oviduct. Under the influence of the same pituitary factors, 

 ^ the cyck of both the gonad and the organ of BIDDER temp- 

 orarely coincide. The organ of BIDDER and the oviduct 

 maintain themselves in the male, after the first estrus, while 

 in the female they are maintained, after the first estrus, by 

 \ the corpus luteum hormone of the ovary. 



