294 ROYAL SOCIETY OF CANADA 



On April 13th feeding with grain was not successful, the food 

 being regurgitated. In order to make sure of having the brain in 

 good condition for microscopic examination the bird was killed on 

 May 3rd. 



2. The second gull was lost as an attempt was made to put him 

 under the influence of chloroform, ether having proved unsatisfactory 

 in the other case. 



3. The third grdl was tested on April 33rd, 1905, the anaesthetic 

 being the A.C.E. mixture. A considerable surface of the cerebrum 

 being exposed, on stimnlating an area situated well forwards and near 

 the middle line, tlie following were the results : — 



(i) Opening of the lids of the eye of the opposite side, 

 (ii) Drawing down the nictitating membrane, 

 (iii) Dilatation of the pupil. 



The bird a few days after ate spontaneously and seemed in no 

 respect the worse of the operation. But things did not go on well 

 and death ensued on May 2nd. An examination revealed the presence 

 of pus and a blood clot. 



The Ckow. 



The bird was readily put under the influence of ether and was 

 kept at the right degree of anœsthesia without any difhiculty. A sur- 

 face on the right side of the cerebrum as large as a ten cent piece 

 was laid bare. Stimulation with various strengths of current, includ- 

 ing such as could not be borne on the hand, produced no movements 

 of the head, wings, legs, or, indeed, any results other than eye move- 

 ments such as have been almost invariably readily obtained by me in 

 various birds, viz. : Movements of the lids, nictitating membrane and 

 iris; best marked and most constant on the side opposite to that of 

 stimulation, though not invariably confined to that side. 



The portion of the cortex indicated above with enough of the white 

 matter beneath to expose the corpus striatum was removed. The part 

 cut away weighed six grains. The results, on stimulation with a 

 current that could be distinctly felt on the moistened finger and that 

 could not be borne on the lip, were in marked contrast to the negative 

 ones obtained from the cortex. There was distinct extension of the 

 toes of the opposite limb and movements of the head to the opposite 

 side. These efi'ects were decided, readily obtained and easily repro- 

 duced. The bird recovered from the anœsthetic quickly and in a few 

 moments was able to sit on his perch. 



