346 



THE PHYSIOLOGY OF REPRODUCTION 



of male secondary characters by a cow previously normal after cystic 

 degeneration of the ovaries. Since in this case the interstitial 

 secreting mechanism of the ovaries was normal, it is suggested that 

 the fxdl development of secondary female cliaracters is correlated with 

 the corpus luteum. 



Steinacli has carried out a number of expeiinients on rats and 

 guinea-pigs, producing the converse eft'ect to that described aljove.^ 

 After transplanting tlie o^'ary into previously castrated males wlien 



Fig. 89. — Ovariotomi.sed Rouen duck — Type II. 

 (From Goodale.) 



((/. Figs, 86, 87, and 88.) The Ijird wa.f operated upon 

 when about a yeai' old. 



the}' were young, very definitely female cliaracters huxe developed. 

 Most noteworthy was the girnvth of the mammary glands and teats, 

 a feminised male guinea-pig yielding milk and suckling ycjung ones. 

 Moreover, the hair is said to have resembled that i>f the normal 

 female, being finer and softer than in the normal male, and the size 

 of the liody was I'educed. Lastly, the feminised animal reacted 

 sexually like a female as shown e.specially by the "tail erect" reflex 

 (normally concerned in coition) and the "kick guarding" reflex (used 

 to keep off' the male before the onset of oestrus). The foliicles in the 

 transplanted ovaries atrophied, l)ut the interstitial cells (or " theca 

 lutein" cells) remained, and these Steinach regards as representing 



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