370 Some Racial Peculiarities of the Negro Brain 
Negro extremes, and a less development in the Caucasian extremes. 
It is possible that the size of the motor area may account for this differ- 
ence on the two sides. 
INDIVIOUALBRAINS Jaq qn C 
CAUCASIAN + 0 
NEGRO - 8 ve 
MULATTO - © 
| | | ee 
CP ee 
Cuart Il. Left Side—Relation of the radii of the anterior association 
center (ordinates) to those of the posterior association center (abscisse). 
See Chart I, Legend. 
A system of means is adopted for the charts. Extremes are avoided 
in this way, and a medium for comparison is obtained which is fairer 
