Preformism and Accommodation 49 



Returning to our main subject, after this digression, we 

 may emphasize the necessity, now so often pointed out, of 

 taking up, wherever possible, the psychophysical point of 

 view, and of recognizing, as of equal importance with the 

 biological, those factors and processes which, it may be, the 

 psychologist alone is able to describe. No better instance 

 can be cited — in illustration of many of the considerations 

 so far advanced — than the problem of the origin of instinct, 

 of which certain phases are treated in the following pages. 



