500 
PROFESSORS D. FERRIER AND G. F. TEO ON THE EFFECTS OF 
During the dressing of the wound consciousness was returning ; the eyes were open, 
the pupils moderate size and contractile to light, and the conjunctival reflex equally 
distinct in both eyes. 
The right eye was then bandaged. 
The animal having gone to sleep for a quarter of an hour began to move about, 
indicating vision by making a grimace when threatened ; and within an hour after the 
operation was running about the laboratory, and picking up things lying on the floor, 
currants, &c. 
No defect being ascertainable as regards vision with the left eye, the left eye—that 
on the side of lesion—was next secured, and the right freed. The animal struggled 
for some time with the bandage, but not succeeding in getting it off, became quieter. 
Very shortly, within an hour and a half after the operation, it indicated vision by 
making a grimace when threatened, and two hours after the operation it was seen to 
pick up pieces of food from the floor to right and left indifferently. 
Some weakness was perceptible in the right hand, which, though used in climbing, 
occasionally slipped and gave way. There was no defect as regards the sensibilitv of 
the hands, and the animal made grimaces and rubbed the palms of both hands when 
it accidentally placed them on a water pipe which was rather hot. 
Next day the animal seemed in perfect health. Sight was to all appearance as 
good as before. When the right and left hands were tested respectively as to their 
grip, the right was perceptibly weaker. Otherwise no difference could be observed. 
Similar observations were made at intervals with the same results up to four months 
after the operation, when the animal was again chloroformed and the right angular 
gyrus exposed and cauterised, and the right occipital lobe removed en masse. The 
portion removed weighed 2 - 75 grammes. The animal, as the dressing was finished, 
was recovering consciousness ; both eyes were open, the pupils equal, and the conjunc¬ 
tival reflex distinct in both eyes. 
Twenty minutes after the operation a sniff of ammonia caused the animal to wake 
up and proceed to walk about the laboratory. Hearing was good, as it responded to 
the grunts and calls of its companions. 
It soon gave evidence of vision to the right side, by approaching the laboratory 
attendant standing on this side, and climbing up his arm. 
Two hours subsequently the left eye was bandaged. The animal was able to see 
and pick up a cherry to the right. To the extreme left front it could not do so, but 
was able to find a cherry to the left of the middle line, reaching its right hand across 
the middle line to seize it. 
After continuous observation for an hour the left eye was freed, and the right 
closed. It was evident that the animal lost thino-s to the left of the middle line. It 
o 
also appeared that vision to the right was limited, for while it seized things to the 
right of the middle line, yet it seemed to lose things placed to the extreme right. 
Next day similar observations were made, with similar results. 
