Popular or Scientific Animal Psychology. 11 



criterion of instinct. For reflex mechanisms are also 

 hereditary; and even intelligence itself, taken as a 

 faculty, is hereditary in the sense that all normal human 

 beings enter into life gifted with this precious faculty. 

 Hence the essence of instinct, in contradistinction to 

 intelligence, should not be based so much on the 

 possibility of hereditary transmission as on the want of 

 intentionality. 



