366 Some Racial Peculiarities of the Negro Brain 
obtained by a view from behind at an angle of about 30° above the hori- 
zontal looking directly forward. 'The outline of the head or skull seen 
in this way is pointed anteriorly and broad and flattened posteriorly. 
This may be seen in the Negro brains under the same conditions. Here 
we see the small frontal lobes, the large parietal region and the straight, 
flat sides over the anterior association centers. That this is not only ap- 
parent, but real, may be determined by measurements of the radii from 
the brain center to the outlines of the plane passing through the brain 
axis at an angle of 45° above the horizontal plane of each hemisphere. 
Such measurements are found in Table II, which gives the dimensions 
of this plane in each non-distorted brain. Radii are projected from the 
brain center for each 10° angle, and perpendiculars are dropped from 
the brain axis for each centimeter on the axis from either end of the 
brain, and these radii and perpendiculars are measured from their origin 
out to the surface of the brain. 
From Table II the following summary is given: 
TABLE II.a 
AVERAGES OF THE ASSOCIATION CENTERS. 
LEFT SIDE RIGHT SIDE 
Z eer 4 5 Se 
E Spas ene ae o: 8. & 
2 & ses D QD S) 
Bog SR Tee ed ae 
bh cal =o oo Dp) uM 4 oO oo De 
eS pee ee es ee ee ees 
fee os) oso a a 8 8 a 25 Ar 
3 & Be soe. eS Sh iS ao Se) eis 
IZ ncc) < a pa ra fee 4 aw = 
mm. mm. mm. mm. mm. mm 
Caucasianymalenas-acmec ot) GlGSe 0) rill 9 Se ers 4 eee Orne Omen opera 
ING@erosmale. Scarce. sroce 43 168 66 73 90 45 168 66 74 89+ 
Caucasian female ....... 8 161 GA mG (aneeeg.6 8 160) 46h = Ciao 
INesro femailley ce eisc ciacer 22 158 62 68 91 22 158 63 69 91 
The numbers represent averages in each case for the number of brains 
given. The fifth column of numbers on each side represents the averages 
of indices of the association centers. The index of the association centers 
for each brain is obtained by dividing the length of the radius for each 
center by the length of one-half the brain axis, and dividing the result ob- 
tained for the anterior association center by the result obtained for the 
posterior association center. The quotient represents the proportion of 
the size of the anterior association center in terms of the posterior asso- 
ciation center, the latter being 100 in each case, the brain axis also en- 
