488 
FROFESSORS D. FERRIER AND G. F. YEO ON THE EFFECTS OF 
perfect health and in every respect normal, and continued so for three weeks, when 
the right angular gyrus was similarly exposed and cauterised on the surface, close up 
to the parieto-occipital fissure. 
During the dressing of the wound the eyes were open, pupils equal medium size, 
and the conjunctival reflex distinct. 
The animal was wrapped in a blanket and laid in a warm place. 
Within a quarter of an hour it got up, shook off the blanket, and on being touched 
gave a screech and made off, knocking his head twice, till it was brought up in a 
corner of the room, where it remained at rest. 
Similar results were obtained on repeated tests continued for an hour and a quarter. 
When urged to move it constantly knocked its head as it ran, or was brought to a 
dead stand against a wall. It was extremely on the alert, and made grimaces 
if approached without caution against sound ; but it paid no attention to threats, &c., 
made at a little distance quietly and without noise. 
Two hours after the operation the animal began to show signs of returning vision. 
It shrunk when the light of a lantern was flashed in its eyes at some distance. It was 
also able when near the hot pipes to climb on to them as usual. Whether it saw very 
clearly could not be made out, but it was able to guide its movements without 
vacillation or uncertainty. 
Next day the animal was in every respect well, eating heartily, and running about 
actively, and showing full possession of sight to every test that could be devised. 
Six weeks subsequently the lesion of the left hemisphere was extended anteriorly 
into the ascending parietal convolution, the grey matter of which was seared with the 
cautery superficially. 
In a quarter of an hour, after the operation the animal got up and w T alked to the 
other side of the laboratory where its companions were, and tried to get among them 
in their cage. It walked lame and stumbled frequently, owing to an evident weak¬ 
ness and tendency to give way of the right arm and hand. It was observed to try and 
pick up a crust of bread with its right hand, but though it thrust its arm forwards it 
could not grasp the object. On attempting to climb up the bars of the cage it fell 
down when it tried to grip with its right hand. 
An hour subsequently the animal was very active. It was observed in climbing to 
trust its weight almost entirely to its left hand and foot. The right hand had not 
entirely lost the power of closure, but the grip was very weak as compared with the 
left, and was easily overcome ; and frequently the animal dropped what it tried 
to hold in its right hand. 
Two days subsequently the weakness of the right hand was still very evident, and 
it was also noted that the right foot was not moved so well as the left, being lifted 
en masse, without the dorsal flexion of the foot and spreading of the toes seen on the 
left side. In climbing, the grip of the right hand and foot was very feeble, the weight 
being trusted almost entirely to the left, which clung firmly on the bars. 
