LESION OF DIFFERENT REGIONS OF THE CEREBRAL HEMISPHERES. 503 
The animal soon learnt to find its way about its cage, finding its food by groping. 
On hearing the sound of food dropped into its cage it would descend from its perch 
and grope about. Occasionally it would return after an unsuccessful search, though 
the food lay before its eyes. Accidentally lighting on something with its hands it 
would take it up, smell, and if not good to eat would throw it down. Satisfied by 
smell it would eat and exhibit satisfaction by gestures and grunts. Hearing was 
most keen. It started at the slightest sound, and frequently returned the grunts and 
calls of its companions. For some weeks it was disinclined to move except about its 
cage, and generally sat still, except when groping for food. If taken out and urged 
to move it ran its head against every obstacle in its path. At the end of three 
months it was less disinclined to move about, and would spontaneously walk out of 
its cage with a companion Monkey placed with it in the same cage. Many and varied 
observations and tests were made as to the animal’s power of vision, and frequently 
doubts were entertained as to whether some of its actions were compatible with 
absolute blindness. 
Six months after the operation the animal was able to move about the laboratory 
and vicinity of its cage with considerable freedom. It had a slouching gait and a 
somnambulistic-like air, its eyes looking steadfastly in the distance. It seemed to be 
aware of its proximity to obstacles, and when left to its own cautious mode of progres¬ 
sion did not knock against them. It was able to find its way to its companion 
at some distance, first listening attentively to the noise of its footsteps. It also 
seemed aware of one’s proximity when within close range. It was difficult to 
approach without exciting the animal’s attention. Yet if this were done with the 
utmost caution against sound it might be approached and the hand waved, or threats, 
&c., made, without causing winking, or the slightest sign of perception. A nearer 
approximation of the hand, however, made the animal uneasy and as if aware of the 
fact. It moved its head and eyes and put out its hand if a stick were waved 
round and round close to its face, but not if at a sufficient distance to avoid causing 
agitation of the air in its immediate proximity. Though it still found its food by 
groping, it seemed occasionally to put its hand out as if it saw. Yet it was unable 
to find a piece of food which it was allowed first to smell, and which was then laid 
down in front of it; and it frequently failed to find what it had accidentally dropped. 
If, moreover, instead of being allowed to walk about quietly at its own leisure, it 
was suddenly startled, by sounds or attempts to lay hold of it, it would look terrified 
and run full tilt against whatever lay in its path. 
The condition remained unaltered as time went on. 
At the end of nine months its eyes were again carefully examined. The pupils 
were large, and did not contract to light. The optic discs were seen to be remarkably 
pale. 
The animal died without any evident assignable cause during the winter season, 
nearly eleven months after the operation. Examination a few days before death 
