30 Instinct. 



that is all we can at present say. For convenience 

 we call this summation of spontaneous powers that 

 extend beyond physiological functions, INSTINCT. 

 This Instinct we find utilizing both structure and 

 function. And we also see it making a broader 

 manifestation controlling the whole being, as when 

 the fowl hides from the bird of prey now seen for 

 the first time, and the migratory birds and fishes 

 know their appointed seasons. 



In the manifestation of Instinct in the relation of 

 the sexes — in the provision made by the parent in- 

 sect for its young which it will never see — in the 

 skill with which every organ is put to its specific 

 use, with the same celerity and accuracy by ani- 

 mals of the same species from age to age, we find 

 some ofthe most interesting fields of speculation. 

 It is here that Natural History and Speculative 

 Philosophy meet, — where they ought not to meet 

 as opponents, — because if they do, one of them 

 must be in the wrong, — but as allies in the search 

 for truth, in unfolding the plan of creation, in set- 

 ting forth its final causes and the varied relations of 

 its parts. 



But if Natural History and Speculative Philos- 

 ophy are to meet on common ground and join as 

 helpers in a common work, each should understand 

 the other and not despise the materials nor the 

 processes which the other is compelled to use. As 

 to their materials, the two departments of science 

 differ greatly. And in the clearness and precision 

 of its processes. Natural History can certainly claim 

 wonderful advances within a short time. This gives 



