Go 
Or 
Robert Bennett Bean 
above the average Spitzka gives for the ten eminent men, and there is 
no reason to believe that this Negro had greater mental powers than any 
one of those eminent men, although he may have been an obscure genius. 
One Caucasian male brain in my series had a corpus callosum of 9.1 square 
centimeters cross section area, and eight other brains, six Caucasian male, 
one mulatto male, and one Negro male had areas between 8 and 9 square 
centimeters, and there is nothing to indicate that these brains were from 
exceptional men, although they may have been. The brain of a laboring 
man pictured by Retzius had a corpus callosum which measured 9.8 
square centimeters in area. The brain weight was 1587 grams. The 
brains in my series with large callosa are invariably large. Of the ten 
brains mentioned above with large callosa each one weighed about 1500 
grams (Table I). The racial distinction in the relation of brain 
weight to the area of the corpus callosum is not marked, but it is 
noticeable. To show this, lines are drawn on Chart V through the 7 
square centimeter ordinate and through the 1300 gram abscissa, these 
lines being extended in a horizontal and in a vertical direction respec- 
tively, until they intersect. One-third of the brains represented below 
the horizontal line and to the left of the vertical line are Caucasian, and 
two-thirds are Negro. ‘Two-thirds of the brains represented above the 
horizontal line and to the right of the vertical line are Caucasian and 
one-third are Negro. A majority of the Negro brains are thus repre- 
sented within the lines and a majority of the Caucasian brains are repre- 
sented without the lines. It is a noteworthy fact that about half of the 
Caucasian brains represented within the lines are from women, or from 
the inmates of Bay View Pauper Asylum, a great many of whom are 
known to have had dementia—alcoholic, syphilitic, or senile. With them 
the brains of such noted men as Gyldens™ (No. 23), Siljestrém” 
(No. 25), a statesman * (No. 26), and Prof. Leidy “ (No. 27), are found. 
These men each had a large brain, or a large callosum, or both. Thir- 
teen Negro brains are found without the lines having a corpus callosum of 
more than 7 square centimeters area, and only eight have a brain weight 
of more than 1300 grams. These invariably give evidence of Caucasian 
characteristics. To be found outside of the lines are a mulatto; a Negro 
who had been instrumental in at least three, and possibly five, murders; 
a Negro accomplice of the latter; a Negro laborer from North Carolina; 
a Negro killed in a railroad wreck; and another the victim of a third-rail 
accident. The racial difference is really more marked than is apparent 
in the chart (V) because the class of Negroes from which bodies are ob- 
tained is comparatively better than the class from which Caucasian bodies 
are obtained, this being especially marked in the females of the two races. 
29 
