-~2 
~2 
Robert Bennett Bean 3 
two sides in each race; and that the left frontal lobe is relatively larger 
than the right in each race, this difference being very slight. 
The extremes of the combined means of the two lobes may be repre- 
sented in a table prepared in the same way as Table II4, and with like re- 
sults, except that the differences are not so marked in this table as in 
Table IT?. 
TABLE IIIc. 
EXTREMES OF THE COMBINED MEANS OF THE FRONTAL AND PARIETAL LOBES. 
Left Side. Right Side. 
Se 
, i, , a > 
Symbols Above Below Above Below 
the line. the line. the line. the line. 
@AUCASIAM! Asc bie waite wee tee 35 9 36 9 
INGOT ON a 5 oc a svaclersus oue!s, oie enone 26 55 25 56 
A greater racial difference exists on the right side than on the left 
side, t. e., more Negro brains have a relatively large frontal lobe, and a 
relatively small parietal lobe on the left side than on the right side; and 
more Caucasian brains have a relatively small frontal lobe and a rela- 
tively large parietal lobe on the left side than on the right side, although 
this difference is manifested in two Negro brains and one Caucasian brain 
only. The racial separation of the races by the 45° line representing the 
mean for all brains is presented in this table by the fifty-five Negro 
symbols below the line and the thirty-five Caucasian symbols above the 
line, on the left side, and by the fifty-six Negro symbols below the line, 
and the thirty-six Caucasian symbols above the line, on the right side. 
It is evident that the frontal lobe of the Negro brain is smaller than 
the frontal lobe of the Caucasian brain, as demonstrated in Charts III 
and IV, and Tables III#, III and III*. This racial difference has been 
recognized by anatomists heretofore, but in only a few individual. in- 
stances has it been emphasized.’ 
Eyen Tiedemann” that eminent continental champion of the Negro, 
although recognizing few differences between the brains of the Negro and 
the European, does admit that the frontal lobes of the Negro brain are 
smaller than those of the European. This difference is not so great, how- 
ever, as the difference demonstrated between the anterior association cen- 
ters of the two races, as represented in outlines, tables, and charts. 
Flechsig, in his masterly work on the development of the fiber tracts 
and cortical areas as represented by myelinization, throws some light on 
the connections of the great association areas, and on their probable func- 
1 Reference Nos. 1, 2, 3, 8, 10, 17, 20, 23, 24, 32, 33, 35, 36, 39, 52, 59, 62, 65, 
66, 68, 79, 82. 
Fae, Loy 56. 
