168 ROYAL SOCIETY OF CANADA 



II. 



The Psychic condition of Birds deprived of jiortions of their cerebrum. 



I propose to treat this subject in detail in a future paper, as such 

 cases afTord an opportunity to observe to what extent the removal of 

 certain portions of the cerebrum modifies the psychic condition of the 

 bird temporarily and permanently. 



The fact that in the one of these birds food and water may be before 

 it, however hungry ii may be, without any response, while in the other 

 no difference may be observed between it and a normal pigeon, is a 

 difference of the most radical kind. Altogether this bird is much lower 

 in the mental scale now than the other. These cases have afforded an 

 opportunity to trace .the origin and the development of certain manifes- 

 tations of mental life, and it is believed that they will of themselves go 

 far to establish some general truths in psychology. It would, however, 

 be premature to enter upon a discussion of that subject in this note. 



