396 
absence of bone. This depression lies as shown in Figures 1 and 2. These 
figures are shadowgraphs representing the side and back views respectively. 
Various muscular troubles arose, in- 
dicating a disturbance of the motor 
region of the brain. A line drawn 
outward, downward and forward at 
an angle of 71.5 degrees with the me- 
dian line and starting from a_ point 
one-half inch, or about one centimeter, 
behind a point midway between the 
glabella and the inion, will approxi- 
mately follow the central fissure’, *. 
With such a line constructed one can 
quite accurately sketch in the outline 
of the brain and its principal fis- 
Fig. 1. Shadowgraph showing location ‘Sures. Such a sketch is shown in Fig- 
of depression as seen from side, Lees 
ure 3. 
From this it is readily seen that 
the depression mostly affects the 
anterior central gyrus. Also. by 
consulting Fig. 2 it is observed that 
the depression is situated almost 
wholly on the left side, passing 
over only about a quarter of an 
inch onto the right side. 
The schemes representing the lo- 
calized areas in man are based on 
the results of observations on the 
raw € « oles = e ey 
monkey, on human pathological Fig. 2 \Shadoweraph showiapeeie 
data and on experiments on man. of depression as seen from behind. 
How Mr. Laxton’s injury confirms our present knowledge of cerebral local- 
ization in man is shown in the following history of the case, a part of which I 
give in his own words: 
“At the time of the injury, Nov. 25, 1892, I was 224 years of age and 
weighed about 145 pounds. My height was about 5 feet 9 inches. At present 
I weigh 160 pounds and measure 5 feet 10 inches while standing on my left 
leg, and 5 feet 9 inches on my right. 
7 Deaver’s Anatomy, Vol. IT, p. 508. 
8 Reid, The Principal Fissures and Convolutions of the Cerebrum, Lancet, 1884. 
