~> 
Oo 
Some Racial Peculiarities of the Negro Brain 
© 
bined means for the two races (45° lines) are obtained by subtracting the 
ordinate 70 mm. from the abscissa of the point at which the 45° line 
crosses this ordinate. The numbers obtained are purely arbitrary, but 
afford a basis of comparison for the two sides and the two races. The 
smaller the number the larger the anterior association center in relation 
to the posterior association center, and the larger the number the larger 
the posterior association center in relation to the anterior association 
center. On comparing this with the index of the association centers 
(Table II 2) it will be found that the deductions are the same from each, 
i. e., the anterior association center is larger relatively to the posterior 
association center in the Caucasian than in the Negro, and larger on the 
left side in each than on the right side, although the latter difference is 
slight. Or the converse of this proposition may be taken. The posterior 
association center is relatively larger in the Negro than in the Caucasian 
and larger on the right side than on the left. A line on the charts at 
45° representing the mean of all brains separates the races in much the 
same way as the arbitrary line before described. A table presents this 
figuratively : 
TABLE IId. 
EXTREMES OF THE COMBINED MEANS OF THE ASSOCIATION CENTERS. 
Left Side. Right Side. 
Cs —_A~—— s 
Above Below Above Below 
Symbols. the line. the line. the line. the line. 
Caucasian a cccsotee. 32 10 33 3 
INGET Open dcine rockon oe 18 45 14 48 
In this table, as in others, a more marked racial difference is found on 
the right side than on the left; fewer brains being over the line on the 
right side. It is interesting to find all of the perfect adult male mu- 
lattoes in white territory on the charts, each one being near the line rep- 
resenting the mean of all brains. Examination of the charts will reveal 
the fact that all the symbols range along this line or in the direction of 
it from left to right, and from below upwards as the size of the brains 
are shown to be larger, the Negro symbols being below and to the right of 
the line, while the Caucasian symbols are above and to the left, except 
those represented in heavy type in the above table as the “ Extremes of 
the Combined Means of the Associatioi Centers.” 
To summarize: 
An attempt is made to demonstrate that the anterior association center 
is relatively smaller in the Negro brain than in the Caucasian; that the 
