THE HISTORY OF MENTAL DEVELOPMENT 151 



man appeared on the globe. He is to be a mental, 

 intelligent being. But he is not to be governed by 

 appetite or mere prudential considerations. These are 

 animal, not human motives. These are not to be 

 disregarded any more than digestion can be safely 

 disregarded by man. But they are not to be his chief 

 motives. He must subordinate these to the higher 

 motives furnished by right and duty. Man is not 

 merely a mental but a moral being. If he sinks below 

 this plane of life he is not following the path marked 

 out for him in all his past development. In order to 

 progress, the higher vertebrate had to subordinate 

 everything to mental development. In order to be- 

 come man it had to develop the rational intelligence. 

 In order to become higher man, present man must sub- 

 ordinate everything to moral development. This is the 

 great law of animal and human development clearly re- 

 vealed in the sequence of physical and mental func- 

 tions. 



Must man be a religious being also ? This question 

 we must try to answer in a future lecture. 



