394 THE DUCTLE8S GLANDS 



consist, as we have seen, in precocious sexual and mental 

 development. This precocity has usually been attributed to 

 a hypopinealism, and this view was supported by the extirpa- 

 tion experiments. But, as we have seen, a similar precocity 

 of development accrues from feeding with pineal substance. 

 This fact introduces a complication which renders it impossible 

 to reconcile the results of clinical observation and experiment a! 

 work upon animals. 



