THE SIZE OF CEREBRUM IN MAMMALIA 51 



mechanism transmitted by heredity, tlie better. The loss of instinct is what 

 permits and lïecessitates the éducation of the réceptive brain. 



We are thus led to the view that it is hardly possible for atheory to be 

 further from the truth than that esponsed by George H. Lewes and adopted 

 by George Romanes, namely that instincts are due to " lapsed " intelli- 

 gence. The fact is that there is no community betvveen the mechanisms of 

 instinct and the mechanisms of intelligence and that the latter are later iu 

 the history of the development of the brain than the former and can only 

 develop in proportion as the former become feeble and defective. 



Thèse few lines — for the abruptness of which I apologize — will, I 

 trust, serve to show the interesting nature of the spéculations connected 

 with the signiflcance of the size of the cerebrum in varions Mammalia and 

 other animais. Some of the suggestions obtained from a considération of 

 the subject, will, if carried out in détail, be found of tirst-rate importance 

 in building up the science of comparative Psychology. 



f ^ 



