516 
PROFESSORS D. FERRIER AND G. F. TEO ON THE EFFECTS OF 
Nineteen months after the operation, just before the animal was killed with chloro¬ 
form, an examination was again made as to the relative strength of the limbs while 
the animal was held on its hack. 
It struggled violently with the right leg, gripping very tightly with the right foot 
whatever it could lay hold of, but the left leg was scarcely used at all, and no attempt 
was x made to grip with this foot. 
The left hand gripped feebly, and this and all the other movements of this limb were 
very easily overcome. The condition was essentially the same as on examination a 
year before. 
Post-mortem examination .—The brain was everywhere normal except in the region 
of the upper half of the fissure of Rolando in the right hemisphere, and in the left 
hippocampal region. 
The lesion of the left hemisphere will be described subsequent^ (see Exp. 24"). 
In the right hemisphere there was destruction of the cortex accurately limited to the 
upper half of the ascending frontal and ascending parietal convolutions. 
The upper margin of the lesion was from 2 to 3 rams, distant from the longitudinal 
fissure, the edges of which were intact. The convex aspect of the superior frontal 
convolution, corresponding with the broad base of the superior frontal, was deeply- 
eroded ; and the grey matter was similarly eroded from the convexity of the ascending 
parietal convolution along the whole-length of the intraparietal sulcus. 
Between the two the fissure of Rolando was still visible, the grey matter at the 
depth of this not having been destroyed. The greater part of the postero-parietal 
lobule was intact, as well as the lower half of the ascending frontal, and lower 
extremity of the ascending parietal convolution (fig. 45). 
The cranial nerves were intact, as well as the optic tracts and crura cerebri. The 
corpora quadrigemina and cerebellar peduncles were uninjured. 
The right crus cerebri was seen to be very appreciably flatter than the left, espe¬ 
cially at the middle of the foot of the crus. The right side of the pons was also flatter 
than the left. 
The left middle peduncle of the cerebellum was somewhat less prominent than the 
right, but no perceptible difference could be made out between the right and left lobes 
of the cerebellum. 
The right pyramid (fig. 46) was only half the size of the left, and slightly greyer 
in tint. 
At the middle of the olivary body the transverse diameter of the right pyramid 
measured only 2 mms., -while the left measured 4 mms. 
The left half of the spinal cord was also only half the size of the right. 
From the junction of the anterior with the posterior cornu to the surface of the 
lateral column the left measured 1’5 mm., -while the right measured 3 mms. 
The posterior columns were equal. 
Transverse sections of the crura cerebri (fig. 47) showed that the middle 
