494 
PROFESSORS D. FERRIER AND G. F. YEO OX THE EFFECTS OF 
On the following day the oedema of the eyelids had entirely disappeared, and both 
eyes were freely and widely open. Still reluctant to move. When urged to do so, 
merely turned round or groped and sprawled about. When a cherry was placed to its 
lips it bit a piece eagerly and seemed to enjoy it. The cherry was then laid on the 
floor in front of it, but it was unable to find it though looking eagerly for it. The 
animal enjoyed its food, which it found by groping about wdth its hands in its cage. 
On the fourth day there were some indications of returning vision. A piece of 
orange was held before it, whereupon it came forward in a groping manner and tried 
to lay hold, but missed repeatedly. When the piece of orange was laid on the floor 
it stretched out its hand over it, short of it, and round about it before it succeeded in 
securing it. 
When urged to move it did so very cautiously, and occasionally came close up to 
the wall before it stopped, but it did not knock its head as before. It was observed 
that when it accidentally dropped a piece of food when eating, it could only find it 
with difficulty, and equally so in front and to either side. Many similar observations 
were made. 
On the fifth day the animal came out of its cage spontaneously and walked about. 
It never now knocked its head. It was evidently able to see its food, but constantly 
missed laying hold of it at first, putting its hand beyond it or short of it. 
On the sixth day the animal walked about freely, avoiding obstacles, but vision 
was evidently defective, as on several occasions it was seen as if about to climb before 
it had come sufficiently near the ledge on which it wished to mount. It was, however, 
able to pick up grains of rice scattered on the floor, but always with uncertainty as to 
their exact position. 
Watched from day to day the animal continued to manifest the same indications of 
defective vision. 
Four weeks after the operation the animal seemed in a feeble state of health and 
disinclined for exertion. The same want of precision was still seen as regards its power 
of putting its hands on objects it wished to pick up. This was apparently equal in all 
directions. 
At this date when it was walking about on a table it tumbled off, having come too 
near the edge without seeming to be aware of the fact. 
After this, being the holiday season, no further observations were made for a time, 
and the animal died in the interim two months and a half after the operation. 
Post-mortem examination .—The brain not being removed immediately was somewhat 
soft, and suffered some damage in removal. 
Examined after hardening in spirit the general aspect was normal, except in the 
region of the angular gyri. 
The left angular gyrus had entirely disappeared with the exception of a small 
portion of the lower extremity of the anterior limb. The neighbouring convolutions 
looked as if they had been dissected out (Plate 21, fig. 13). 
