282 Natural History Bulletin. 



the older birds are reminded that «they have on previous years 

 obtained comfort and food by moving southward aided by 

 this favorable breeze. The younger birds may go south in 

 imitation of their elders, or the "inherited habit" idea may 

 enter in here. 



I do not see that either of the above theories is necessarily 

 exclusive of the other, but will venture the prediction that it 

 will ultimately be found that we have altogether underrated 

 the psychological activities of birds, and that they are con- 

 scious of the intent and result of many acts which we have 

 been in the habit of regarding as purely instinctive. 



The following table shows at a glance the more important 

 features of the geographical distribution of the birds of the 

 Lower Saskatchewan. 



