Robert Bennett Bean 411 
or the male from the female. After that a record was kept of the guess 
made on each brain, except those I could recognize from previous hand- 
ling, before the race or sex was known, these being looked up afterwards, 
to determine the degree of accuracy possible in such a guess. The race 
was determined correctly 70 times, doubtfully 5 times, and incorrectly 
5 times in 80 brains. The sex was determined correctly 69 times, doubt- 
fully once, and incorrectly 10 times. The race and sex were determined 
correctly 60 times, one or the other correctly 15 times, and incorrectly 5 
times. Of the 5 incorrect guesses a Caucasian female brain was taken to 
1200 
Cuarr XIl.—Percentages of brain weight, in relation to stature and body 
weight combined. 
be a Negro male in one case (No. 1583), a Negro female in another (No. 
1527) ; a Caucasian male brain was taken to be a Negro male in two 
cases (Nos. 1716 and 1749), but with one of these there was some doubt; 
and a Negro male was taken to be a Caucasian male in one case (No. 
1707). Mulattoes partook of one type or, the other as a rule, sometimes 
resembling the Negro and sometimes the Caucasian more closely. 
CONCLUSIONS. 
1. The brain of the American Negro is smaller than that of the 
American Caucasian, the difference being primarily in the frontal lobe, 
and it follows that the anterior association center is relatively and abso- 
lutely smaller. , 
id 
