LESION OF DIFFERENT REGIONS OF THE CEREBRAL HEMISPHERES. 549 
that there was no reaction to a heated point placed against the right hand or foot, 
whereas on the left the signs of sensation were most active. 
No determination could be made as to hearing or vision, as the animal would not 
respond to such tests as were employed. Next day the animal was well and vigorous, 
and able to run about and climb up the bars of its cage hand over hand. There was 
no trace of motor paralysis. 
Hearing was equally acute right and left, judged by the response to the slightest 
sound close to each ear respectively. Vision seemed slightly impaired towards the 
right. The animal seized a piece of carrot offered it on the right, but it seemed to 
be somewhat uncertain as to the exact position. Tactile sensibility was profoundly 
impaired, though extreme heat caused withdrawal of the right hand and foot, yet a 
degree of heat which caused active signs of uneasiness on the left was allowed against 
the right hand and foot without any sign whatever. Pricking with a pin all over the 
right side was allowed without any appearance of sensation, whereas on the left 
the animal invariably winced and struggled to escape. Scratching the right groin and 
flank with the point of a stick caused no sign of perception, whereas the same on the 
left caused the animal to twitch its flank as if to shake off a fly in this region. A 
spill of paper introduced within the right nostril caused barely any sign, whereas on 
the left an active grimace of uneasiness was caused. 
It was observed while quietly eating a piece of carrot which it held in his left hand 
to accidentally drop the piece, and though it fell in contact with the right hand, the 
animal did not seem aware of the fact, and groped about with its left hand till it 
found it. 
On the third day the animal appeared in much the same condition, but it did not 
seem so inclined to run about spontaneously as before. Tactile sensibility was still 
profoundly impaired on the right side as before. 
During the afternoon of this day the animal had an attack of unilateral spasm 
of the right side, lasting a few seconds, and apparently without loss of consciousness. 
Some time after this when the sensibility was again tested, there seemed to be 
almost complete analgesia over the whole of the right side. Heat which excited lively 
sensation on the left, caused no indication on the right ; and there was no sign of 
perception of tickling, pricking, &c., on this side. 
The right limbs were used now very awkwardly, and occasionally doubled up so 
that the animal fell over on the right. 
On the fourth day this doubling up of the limbs, and planting them in unnatural 
positions continued, so that the animal continually slipped and fell over on the right. 
But when it was taken out and examined, it was found that every volitional move¬ 
ment of the limbs was capable of being carried out, and the animal could grip with both 
hand and foot on the right as well as on the left. Tactile sensibility, as regards touch, 
tickling, &c , was absolutely abolished on the right side, the same stimulus invariably 
attracting the animal’s attention on the left. 
