THE CENTRAL NERVOUS SYSTEM 379 
congested. The pia arachiioid contained no excess of 
fluid but the summits of the convolutions were flattened. 
The mass was located in the posterior frontal convolution, 
near the longitudinal fissure, occupying nearly its whole 
breadth and penetrating about one centimetre. It did 
not enter the fornicate gyrus. There was a completely 
degenerated core about two mm. across. The adjacent 
bone was beginning to erode. No localizing signs 
were reported. 
The other case, that of a young Drill baboon {Papio 
leucophceus), was studied with Dr. J. H. W. Rhein and 
can be reported in the following condensed notes. 
The baboon appeared to be perfectly well until October 18, 1906, 
when some lameness in the anterior and posterior extremities on the 
right side was observed. This gradually increased, and was associated 
with general convulsions. On November 30th, I made an examination 
and found the following condition : The right upper and lower extremi- 
ties were weaker than on the left side. On the left side the power seemed 
to be fair. He was able to hold on to an iron bar with the Angers of 
the upper and lower extremities on the right side but in withdrawing 
the bar it was not difficult to overcome his grasp and the power on this 
side was distinctly less than on the left. The movements of the right 
arm were somewhat ataxic, as observed when he made efforts to grasp 
the bar. The knee jerks were increased on both sides and appeared 
to be equally so. There was no evidence of facial palsy. He moved 
both sides of the face equally well at times when he expressed anger 
or fear in the facial expression. The tongue seemed to be retracted 
equally well on both sides. Tests for hemianopsia were, of course, un- 
satisfactory, but he seemed to recognize readily the approach of the 
iron bar from both sides. There was no disturbance of the rectal or 
bladder functions, although at autopsy the bladder was full. Death 
occurred on December 2, 1906. At the autopsy the brain and spinal 
cord, with the other organs were examined. The dura was adherent 
to the left side of the brain, in the prefrontal region, in the upper 
third and when the brain was removed it was observed that an area 
of softening lay beneath this point. A small caseous mass was also 
observed at the base of the right lung, and beneath the diaphragm on 
the right side was a large abscess, partly involving the liver. The 
tubercle bacillus was found in the pus removed from the area of soften- 
ing beneath the left cortex. A study of the brain revealed the presence 
of three foci of softening. The largest one was situated in the left 
hemisphere in the prefrontal region, and extended from just beneath 
the cortex in the upper third of the region, downward almost to the 
base of the brain. This area was cylindrical in shape and measured 
