28 
PROFESSORS V. HORSLEY AND E. A. SCHAFER 
This animal lived three months. The brain was unfortunately mislaid, so that we 
are unable to give a representation of it, but the exact extent of the lesion had been 
carefully noted at the time of operation. 
11. 
Lesion. — Removal of a longitudinal strip of grey matter on the left side of the 
brain along the margin of the longitudinal fissure from the anterior end of the 
precentral sulcus nearly to the parieto-occipital fissure. 
Result. — The day after the operation there was some pai'alysis of both right limbs, 
with unsteadiness of gait. The arm, however, after a few days recovered to all appear- 
ance completely. But in the leg, although it was difficult after a time, when the animal 
was freely running and climbing, to obtain evidence of paralysis, yet when sitting on 
a perch the right leg always hangs down, and when the animal is held and suddenly 
lo"wered to the ground the right leg is not extended like the other. There also seems- 
a deficient power of grasping in the toes of the right foot. These pareses, although 
not extensive, were permanent. They were not accompanied by any perceptible 
deficiency in sensibility. 
Whilst examining this Monkey on the fourth day after the operation, on taking 
hold of the right arm, a fit commenced, lasting for seven or eight minutes. It began 
with retraction of the right arm, followed by spasmodic flexion and extension at the 
elbow. This was succeeded by spasmodic flexion at the hip and slight extension at 
the knee. Still later, the head began to turn to the right, with clonic spasms, with 
twisting of the body to the right, and marked arching of the spine (concavity to the 
right). 
The animal had a similar, but shorter, fit on the morning after the operation (seen 
only by the attendant). None others were observed. 
The brain of this Monkey is shown in fig. 11, Plate 2. 
The animal lived a year after the operation. 
12. 
Lesion. — Ablation of the left marginal gyrus (its posterior three-fourths) and the 
narrow adjoining strip of the external surface extending laterally as far as the 
sulcus X. 
Result. — Paralysis of right side of trunk and of right leg ; partial paralysis of 
right arm, which seems to have a very imperfect power of extension from the 
shoulder. 
This Monkey was attacked a few days after the operation by gangrenous oedema of 
the right extremities. This eventually resulted in recovery, but not before the right 
foot and a part of the right hand had become lost. The animal was killed six months 
after the operation. 
The brain is represented in fig. 12, Plate 2. 
