ox THE FUNCTIONS OF THE CEREBRAL CORTEX. 
39 
was permanent ; lasting, that is to say, until the animal was killed three-and-a-half 
months after the operation. 
Experiments upon the other special senses, as is usually the case with unilateral 
lesions, gave no definite results. 
There was no muscular paralysis. 
The brain is represented as seen from below (right hemisphere) in fig. 34a 
(Plate 6), and in section in figs. 34c, D, e. The posterior aspect of the right hemi- 
sphere is given in fig. 34b. 
35. 
Lesion I. — 'Removal of a large part of the left temporo-sphenoidal lobe, with the 
exception of the superior gyrus. The hippocampus major was included in the 
removal, but the gyrus hippocampi only partially (see fig. 35b, Plate 6). 
Result. — No diflPerence could be detected on the two sides as regarded sensibiUty. 
Hearing was not tested. 
Lesion 2. — One month later the gyrus fornicatus and the quadrate lob ale of the same 
side were removed as completely as was possible. 
Result.— In testing the next day, it is found that there is complete insensibility to 
tactile impressions over the whole of the right side, although on the left side these 
produce a marked reaction. Even to a prick, hard pressure, or the contact of a hot 
wire, there is only a slow reaction on the right side. The animal was completely 
recovered from the operation by the third day, but retained the same condition, the 
right side becoming every day, however, somewhat more sensitive to impressions. 
But this recovery proceeded only to a certain extent. Even three-and-a-half months 
after the second operation (when the animal was killed) there was still a distinct 
difference in sensibility on the two sides of the body. 
No hemiopia was noticed in this Monkey, nor could any definite results be arrived 
at regarding the other special senses. 
The lesions are shown in figs. 35a, b, and c. 
36. 
Lesion. — Removal of a considerable part of the left gyfus fornicatus. During the 
operation there was much venous haemorrhage, and several of the veins passing from 
the outer surface into the longitudinal sinus had to be tied. The marginal gyrus and 
the motor region of the outer surface of the hemisphere Were also somewhat com- 
pressed in the endeavour more completely to expose the gyrus fornicatus, and, as the 
post-mortem examination of the brain showed, they did not escape permanent injury, 
especially the gyrus marginalis (see fig. 36, Plate 6). 
Result. — On testing for sensibility the next day, " it is found that the right upper 
limb, and the whole of the right side of the body as far as the level of the iliac crest, 
is almost completely insensible to touch, to the prick of a pin, and to a jet of cold 
A\ aler suddenly applied. A heated wire is felt when applied to the back, of the fore- 
