No. 509] ECOLOGY OF INDIA X COh'X PL A. XT 301 



tural, adaptation may follow the psychological, but as 

 secondary to it. This is only saying in other words that 

 the central nervous system, on which special functioning 

 peculiarities of habit depend, is subject, like any other, 

 to adaptive variations, and that these variations may 

 either follow and reinforce those of some other organ 

 or organs tending to the same end, or that they may arise 

 independently of any other; and this is merely extending 

 to insects a generalization very obvious with respect to 

 man— finding warrant for the extension, as we do, in the 

 facts disclosed by an examination of the general economy 

 of insect life. 



