26 
PKOFESSORS V. HORSLEr AND E. A. SCHAFER 
ordinarily this limb remains flexed and motionless. The hand and fingers are 
paralysed. Very little, if any, paresis of face-muscles. No paresis of trunk or of 
head-movements was detected. 
Lived two months after operation. Cause of death doubtful ; probably chill. In 
this Monkey the lesion was found on post-mortem examination to involve a strip of 
the angular gyrus, but no symptoms affecting visual perceptions were noticed during 
life. 
The condition of the brain is shown in fig. 5 as seen from above, and in fig. 5 a as 
shown in section, the section passing through the middle of the lesion. It is seen 
from the section that the whole thickness of the grey matter was completely removed 
over the area operated upon. Just at this point the marginal gyrus is somewhat 
encroached upon by the cut made into the white matter, but in other parts it was not 
touched. 
6. 
Lesion. — In this Monkey the motor region of the external surface on the left side 
was touched quite superficially with the actual cautery. 
Result. — The motor paralysis for the first three or four days was not nearly so 
complete as after excision or deep cauterisation, but afterwards became more complete. 
There was no perceptible difierence of sensibility on the two sides of the body. 
The animal only survived the operation a few days. After death the grey matter 
under the cauterised surface was found to be considerably disorganised, and sections 
through the hemisphere revealed the presence of numerous infarcts in the subjacent 
white substance. 
The brain is represented as seen from above in fig. 6, Plate 1, and in section 
through the lesion in fig. 6a. 
7. 
Lesion. — The whole of Ferrier's areas in front of the fissure of Rolando were 
removed in this Monkey, the lesion extending nearly to the margin above, as far as 
the fissure of Rolando behind, and in front and below as far as an oblique line 
connecting the antero-superior extremity of the precentral sulcus with the lower 
end of the ascending frontal gyrus. 
Result. — The only symptom exhibited up to the 7th day after the operation, ^.e., 
previous to the occurrence of the unfavourable conditions mentioned below, Avas 
paralysis of the opposite arm muscles below the shoulder, without contracture. Ko 
paralysis could "be detected in the trunk, leg, or in the face. 
This animal went on well until the eighth day, when the skin began to slough, 
and eventually hernia cerebri occurred, producing death on the nineteenth day. This 
brain is not represented, as the accurate mapping out of the lesion was prevented 
by the occurrence of hernia. 
