PHYSIOLOGICAL PROPEETIES OF GONADS 373 



This same behavior continued throughout the entire period 

 of nine months, and though observed many times the reactions 

 were in no respects different from the above. At some periods 

 the animal was tested daily or many times a day, and at other 

 times at week intervals, the animal remaining alone in the mean- 

 time. In the case of this animal, as with several others, newly 

 born young and their mother were allowed to remain in the cage 

 with the observed animal for a week or longer so that the animal 

 would become accustomed to the young, yet throughout the entire 

 period there was never an indication of a maternal reaction on 

 the part of the male. On the contrary, the animal retained its 

 male psychical characteristics and reacted as a typical male. 

 Before the animal was killed the mammary glands were notice- 

 ably reduced in size from their former swollen condition. The 

 grafts were also somewhat less easily palpated than during Decem- 

 ber, and it was evident that regression was taking place. The 

 animal was killed in March, 1919, at which time the grafts were 

 almost indistinguishable; two small pieces of tissue, however, 

 were cut from the site of transplantation and preserved in Bouin's 

 fluid. 



One of these grafts had been entirely absorbed, for there was 

 no recognizable ovarian tissue in the scar-like mass cut from the 

 site of implantation; muscle tissue and a great amount of fibrous 

 connective tissue composed the entire mass. 



The second graft, much the larger of the two, consisted of about 

 six hundred sections of tissue, but the tissue was in a very degen- 

 erate condition. Cortex and medulla could not be easily dis- 

 tinguished. There were five or six recognizable Graafian follicles, 

 but all of these were in a very degenerate condition the follicular 

 cavities containing cell debris and the stratum granulosum under- 

 going dissolution. Throughout the entire mass, fibrous connective 

 tissue was present in abundance, and it would be difficult to 

 recognize the majority of sections as having been an ovary. 



Male 68 A I. Born June 20, 1918. July 8th, testes removed, 

 ovaries transplanted. February 15, 1919, animal killed. 



