32 
PROFESSORS V. HORSLET AND E. A. SCHAFER 
The animal died on the ninth day. 
The post-mortem elicited, as is frequently the case after these lesions, the existence 
of dysenteric ulceration of the solitary follicles of the large intestine. The general 
surface of the brain was perfectly healthy, without any sign of clot or extravasation 
except just along the lesion.'"' 
The hemispheres are shown, seen on their mesial aspect, with the full extent of the 
lesion displayed in figs. 19 R, and 19 l., Plate 2. 
20. 
Lesion. — Removal of posterior three-fourths of both marginal convolutions. 
Result. — Complete paralysis of trunk and legs, except that the latter can be feebly 
drawn up under the abdomen. The Monkey assumes the attitude characteristic of 
this lesion (see p. 13 and fig. 20, Plate 3). Cannot sit up at all, but can drag itself 
about by its arms. No head or face paralysis. 
Death on the eighth day, with symptoms of dysenteric diarrhoea. 
The brain was sliced as a whole, so that no drawing of the superficial extent of the 
lesion was made, but the extent of the removal of the grey matter of the marginal 
convolutions is shown in section in the accompanying drawings (figs. 20a, b, c, 
and d), which are numbered successively from before back. It will be seen from 
these that it is only quite at the posterior end that any of the grey matter of these 
convolutions is left. 
The animal itself is shown in fig. 20 (from a photograph). 
21. 
Lesion. — Removal of posterior three-fourths of both marginal gyri at one operation. 
Result. — Paralysis of trunk and legs. The animal cannot sit up, but lies on one 
side, generally the right, with legs drawn up, and spine and tail §tiffly flexed. This 
position of the trunk and limbs appears to be due to contracture of the muscles ; it is 
most marked in the limbs of the left side. On the left side the foot is flexed, on the 
right it is extended ; the toes are semiflexed on the right side, completely flexed on 
the left. When one attempts to straighten the legs or to move the tail pain seems 
to be caused. The arms and hands are not paralysed, and are used in progression as 
before described (pp. 13-14). Appetite good throughout. 
Death from dysenteric diarrhoea on the twenty- seventh day. The solitary follicles 
of the large intestine were found after death to be extensively ulcerated. 
On removing the brain a considerable clot, more or less organised, was found resting 
against the injured surface of the marginal convolution of the right side. Perhaps the 
* Although we have only actually mentioned the healthy aspect of the rest of the brain in one or two 
instances, it is right that we should state once for all that in all the cases we have here recorded, unless 
the contrary is directly mentioned, all parts of the brain other than those destroyed in the operation 
presented on post-mortem examination a perfectly normal aspect. 
