[mills] comparative PHYSIOLOGY AND PSYCHOLOGY 293 



While he would eat almost anything usually offered animals as 

 food, he preferred flesh, and still more fish, but above all mice, whicli 

 he swallowed whole when not very large. I have no doubt he would 

 deal with live mice as did the hawk, but I have not been able to 

 test liim as to this thus far. He held down with his claws and tore 

 mice and rats to pieces much in the same way as the hawk, but without 

 that bird's great power and rapidity of action. Like the sea-gulls 

 he would bite severely, if given the opportunity, on attempting to handle 

 him. He has been throughout kept in a cage like that used for the 

 hawk. 



Experimental. 



Having made experiments on pigeons, extending over some years, 

 especially with reference to the question of cerebral localization and the 

 results of removal of portions of the brain, I was anxious to extend 

 these experiments to other birds, more particularly those like the hawk 

 of extraordinary power of feet and beak. I regret that I did not carry 

 out experiments on this bird, but I foum him so interesting to study 

 psychologically that I was diverted from the physiological, which I 

 hoped might receive attention later. On the gulls and the crow, how- 

 ever, I can report some results. 



1. On April 3rd, 1905, one of the gulls was with some difficulty 

 put imder ether. The anaesthetic effect was with difficulty brought 

 about and maintained. The action of the drug on the heart was pro- 

 nounced, the sounds being rendered so distinct they could be heard 

 some feet away, reminding one of a steam launch in the distance. Under 

 no strength of current could movements be produced by stimulation of 

 any part of the cortex that could be reached, in spite of free exposure 

 of a large surface. In other words, the result was wholly negative 

 so far as cortical cerebral localization is concerned. Then a large por- 

 tion, weighing 15 grammes, was sliced away. There was not much 

 hsemorrhage and the wounds healed rapidly. On the day following 

 the operation examination showed that the bird was palpably blind on 

 the side opposite to that of operation. He was a little shaky on his 

 feet, but seemed as fearless as before and showed his usual inclination 

 to bite, but he took no notice of mice as he did prior to operation. The 

 bird did not eat of his own accord, but was fed with raw meat and 

 water was poured into the gullet through a fimnel. The meat was 

 regurgitated. 



On April 6th, bread and milk was fed artificially and well retained. 

 It is observed that to compensate for his blind eye he turns the head 

 about much more than is usual. 



