356 



absence of bone. This depression lies as shown in Figures 1 and 2. These 

 figures are shadowgraphs representing tbe side and back views respectively. 



Various muscular troubles arose, in- 

 dicating a disturbance of the motor 

 region of tbe brain. A line drawn 

 outward, downward and forward at 

 an angle of 71.5 degrees with tbe 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 7 , s . 

 With such a line constructed one can 

 quite accurately sketch in the outline 

 of the brain and its principal fis- 

 sures. Such a sketch is shown in Fig- 

 ure 3. 



Fig. 1. Shadowgraph showing location 

 of depression as seen from side. 



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 

 monkey, on human pathological 

 data and on experiments on man. 



Fig. 2. Shadowgraph showintr position 

 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 22i 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. II, p. 508. 



* Reid, The Principal Fissures and Convolutions of the Cerebrum, Lancet, 1884. 



