546 
PROFESSORS D. FERRIER AND G. F. TEO OX THE EFFECTS OF 
the hippocampal region, were scooped out; care being taken to avoid going too far 
inwards and inflicting injury on the optic tract and crus cerebri. The exact extent of 
the injury inflicted could only be determined however on post-mortem examination. 
Within half an hour after the operation the animal was quite on the alert, and was 
able to sit up, but it rested with the right hand doubled up, and frequently fell over 
on tire right side when it tried to move. 
At this time and for the next hour the animal allowed a heated wire to lie in 
contact with the right hand and foot altogether unheeded, the faintest touch on the 
left caused the most lively signs of sensation. 
The whole of the right side was gently touched and rubbed, or deeply pricked and 
pinched without the slightest sign of sensation ; whereas on the left the animal’s 
attention was invariably excited and directed to the part touched. 
Hearing was retained on the right side as acutely, to all appearance, as on the 
left; the slightest scratching or tapping near the right ear causing the animal to look 
round, precisely as it did on the left. When the animal had its eyes shut the 
slightest sound near its right ear caused it to open its eyes and look. 
As to vision there was some doubt as to whether this was affected towards the 
right. To the left it was undoubtedly retained. 
The animal sat with the right hand sprawling outwards. While it was so resting, 
and with its eyes shut, I drew away the right arm until the animal fell over, without 
its having opened its eyes or shown the least sign of perception. The muscular sense 
of the right arm was thus shown to be abolished, and the awkward position and 
doubling up of the right limbs would be similarly accounted for. 
Kext day the condition of the animal was essentially the same. It planted the 
right hand and foot in an awkward and abnormal manner and continually tended 
to fall over on this side. But there was no motor paralysis. It used the right hand 
and foot for grasping purposes, and when laid hold of it struggled and gripped firmly 
with all four limbs. 
The eyes were open equally, the pupils of moderate size, equal and contractile. 
Vision seemed somewhat impaired towards the right, but not abolished, as the 
animal was able to put out its right hand to lay hold of a chestnut offered it on the 
right, but it did so with a little uncertainty and want of precision. 
Hearing was unimpaired on the right side. 
Tactile sensibility was still almost nil on the right side. The animal allowed a 
degree of heat against any part of its right side without the slightest sign of per¬ 
ception or uneasiness, which immediately caused the most lively manifestations of 
pain on the left side. 
It paid no attention whatever to touching or scratching the right hand or foot with 
the point of a stick. When this was done on the left the animal invariably tried to 
lay hold of the stick and push it away or angrily bite it. 
The animal being then taken out of the cage and held firmly, a spill of paper 
