404 Some Racial Peculiarities of the Negro Brain 
BRAIN AXIS. 
The brain axis used in the measurements for this study is determined 
and located by three points, the inferior border of the splenium, the su- 
perior border of the anterior commissure and the foramen of Munro. A 
line is drawn on each outline of the mesial surface of each hemisphere 
690 mn 
CAUCASIAN + O a 
NEGRO _. | 
S, 
aa 
ae 
po f 
H 
13/00 
Lag GRAM 
Cuart X.—Relation of the area of the brain outlines (ordinates) to brain 
weight (abscisse). The Caucasian is more variable, the Negro more con- 
stant. 
through these three points, to each extremity of the brain. This line is 
arbitrarily made to touch the lower border of the splenium and the upper 
border of the anterior commissure, and it passes through the foramen of 
Munro in 90% of the cases, and falls from 1 to 3 mm. below it in 10%. 
