6 ROYAL SOCIETY OF CANADA 



Unless otherwise stated, the movements will be understood to be on 



the opposite side in all cases. 



Cask l.—Crosshrcd puppy ; Ufli daij of life. — Eyes not open. Ether. 

 Right side of brain exposed. 

 With any bnt the sti'ongest current no movement. One movement of the 



hind-leg with strongest current. The same result for the otlier side of brain. 



There is also one movement when sharp-pointed electrodes are pushed into 



the brain to the depth of 3-0 mm. After this no positive result to be obtained. 



The result for stimulation of the white matter is in no wise more marked than 



in the case of the cortex. 



l''hough no one of these very young animals had reached the eighth 

 day of life, the results were absolutely negative for both cortex and 

 medulla (white matter) with any strength of current. 



The result of testing older tlogs will now be given. 



Cask II. — Mongrel pupjjy ; In days old. — Eyes slightly opened. Ether. 



Only the strongest current applied to cortex gave anj' positive result, but 

 with such a current the hind-leg and the head moved, the latter to the opposite 

 side. This applies to both sides of the brain. 



The surface of the brain over the area stimulated with the above result, 

 together with considerably more, is sliced away. On one side no result on 

 stimulation ^^■ith any strength of current. ^ 



On sinking the electrodes into the brain to the depth of one-half inch, 

 the foreleg, both hind-legs and the head move. 

 Cask III. —Mongrel bitch pu2)2^y; U days oZc?.— Eyes partly open. Ether. 



With current C get movement of hind-leg alone wlien deeply under ether. 

 Later, when slightly ana'sthetized, get movement of head, fore-leg and hind- 

 leg, by stimulation of the areas which in the main correspond to those of the 

 mature dog ; but by using a somewhat stronger current over any one of these 

 areas movements of all the three parts mentioned occur ; with a slightly weaker 

 current both the fore-leg and the hind-leg are moved. 



It is impossible to decide that one leg is made to move more readily 

 than the other. 



The advance in one day in a puppy of the same litter seems to be well illus- 

 trated in this case. 

 Cask W.— Cross-bred hitch puppy; J If h day.— Eyes open. Ether. Considerable 

 hfemorrhage. 



Stimulation on right side with current B produces only movement of hind- 

 leg ; on opposite side the same result, also movement of the fore-leg once. 

 Medulla (white matter), negative. 

 Cask v.— Crosshred bitch jjuppy ; 10th day.— Eyea not open. Ether. Negative to 

 stimulation of cortex on both sides till current C used, when the hind-leg is 

 moved ; result the same when the incdulla is stimulated. No real localization 

 with moderate currents. 

 Cask Yl.— Cross-bred dog pnpj^y of saiue litter ; IJth day.— Eyes half open. p]ther. 



Can get no positive results with B and C, but with D get the following: 

 Hind-leg, head and foreleg (once) movements. There is in this case localiza- 

 tion, though apparently the head movement is the most perfect. 

 Cask VIL — Cross-bred, dog pupj)y of same litter ; 15th day.— Eyes well open. 

 Ether. 



With current B movement of the hind-leg ; with C, of both fore-leg and 

 hind-leg on stimulating adjacent areas ; head movements with only the strong- 

 est current. 



