I 



accumulation of neutral lipid bas been observed during hibernation. In 

 the semineferous tubules maximum amount of unsaturated lipid and plas- 

 malogen bas been observed during August and minimum during February. 

 The interstitial cells on the other hand contained hi^est amount of 

 cholestérol and plasmalogen during February. The lipid fraedons disap- 

 peared from the testes at this time on injection of pituitary gonadotrophin. 

 During hibernation an impairment in the release of gonadotrophin might 

 be postulated by thèse findings. 



- 107 - 



