1 66 The Study of Animal Life part ii 



(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 "lapsing of intelligence," forming "second- 



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

 But the probable factors are the first two. 



