1 66 The Study of Animal Life PART n 



(2) Individual intelligence, which directly modifies the 



actions of individuals, and is also used when, by 

 imitation and education, the habits of a species 

 are steadily improved. 



(3) The a lapsing of intelligence," forming " second- 



ary," and helping to form " mixed " instincts. 

 But the probable factors are the first two. 



