480 
PROFESSORS D. FERRIER AND G. F. YEO ON THE EFFECTS OF 
Introduction. 
The subjects of the following experiments were exclusively Monkeys, mostly species 
of Macacque. 
The animals were in all cases thoroughly narcotised with chloroform, and kept in a 
state of complete anaesthesia during the whole of the operative procedure. 
The lesions were made as a rule by means of the galvanic cautery. Occasionally 
the ordinary cautery was employed where the other was inconvenient. 
All the operations were carried out under antiseptic precautions. These and the 
modes of dressing the wounds have been described by the authors elsewhere and are 
not entered into here. 
SECTION I, 
Lesions of the Angular Gyri and Occipital Lobes. 
Experiment 1* (Plate 20, fig. l). 
In this animal the left occipital lobe was exposed and entirely severed and removed 
in a line parallel with, and -^ths of an inch posterior to, the parieto-occipital fissure. 
The left eye was bandaged, and the animal left to recover from its stupor. 
An hour after the operation it was able to sit up, but it was very prostrate, and 
unwilling to move. 
Next morning it was found to have torn off all the dressings, and the wound was 
discharging freely. The animal was however very lively and ate heartily. No affec¬ 
tion of vision could be made out. It thrust its hands through the bars of the cage to 
lay hold of things offered it, and it did so with its right hand to seize a piece of potato 
held to its right front. There seemed therefore to be no right hemiopia. 
Some hours afterwards the animal was allowed to run about the laboratory, which it 
did in every direction, passing among chairs, tables, and other articles of furniture 
without ever once knocking its head on one side or the other. 
A slight degree of awkwardness was observed at this time in the movements of the 
right hind leg, which had not been observed before. 
Nothing else of importance was noted during the next two days except an increase 
in the weakness of the right leg. There were signs of inflammation and hernia cerebri, 
and the animal became comatose and died on the fifth day after the operation. 
Post-mortem examination —-The edges of the incision of the scalp had not united, 
and at the posterior extremity a portion of reddish fungus cerebri was protruding. 
On removal of the scalp the opening in the left occipital region was found to be filled 
with a protruding fungus, and on removal of the dura mater the whole convexity of 
the left hemisphere was seen to be intensely congested, A less degree of vascularity 
also existed on the right side. 
There was some degree of congestion and exudation also at the base. 
