Life and Instinct 



213 



but of things with actions, and often with wonderful powers of 

 imitation. 



In the order of evolution the simple reflex responses were the 

 precursors of instinct, and instinct of intelligence. The degrees 

 of the latter are not sharply denned, and it is possible that all 

 types of response intergrade. Yet, according to the later views 

 of evolutionary progress, the forward steps may be rapid as well 

 as slow, and intelligence may mark one of those sudden advances, 

 which have appeared in the past history of life on the earth. 



