400 Some Racial Pecularities of the Negro Brain 
good size, the isthmus is not well marked, and the body is slender. The 
brain is slightly longer than in Type I, but is smaller, the smallest of 
all brains being in this type. The average weight is 995 grams. The 
subjects are taller (168 cm.—5 feet 6 inches), and weigh less (45 kilo.— 
100 pounds or less) than those in Type I. These are probably of the 
Hottentot or Bosjeswoman type. 
Type IV is a composite of five cases. The cross section of the corpus 
callosum is long, straight and slender. The splenium is large and club- 
shaped, the isthmus is narrow, the body is long and narrow, and the genu 
is of good size. The brains are long and narrow (dolichocephalic). The 
frontal lobes are narrow, low, and long, the parietal lobes are large and 
prominent. The brain weight ranges from 1000 to 1200 grams. The 
subjects are in a fairly well nourished condition, weighing from 54 to 59 
kilo. (120 to 130 pounds), and having a height of 165 cm. (5 feet 5 
inches) average. These are the old women from 60 to 70 years of age, 
of medium height and weight and light-brown skin. There is evidence 
of a little white blood. This type is probably of Kaffir origin. 
Type III is a composite of six cases. The cross section of the corpus 
callosum is long, extremely thin and curved. The splenium is large and 
knob-shaped, the isthmus is narrow, the body long, narrow, and curved, 
and the genu small, with a long pointed beak. The brains are exceedingly 
long and narrow, and somewhat high in front. The frontal lobes are 
long, narrow, and thin, but high, the parietal lobes are full and bulging. 
The brain weight is from 1000 to 1100 grams. The subjects are low, fat 
and heavy. The average height is about 155 cm. (5 feet 1 inch), the 
average weight is 68 kilo. (150 pounds), and the age is from 30 to 50 
years. This is the Negro “ mammiy,” who is so well known. We have 
here a fat, fair-skinned Negro woman, not tall, but of a voluptuous type. 
There is evidence of white intermixture. This type probably represents 
the better class of the Guinea Coast Negro. 'The female types conform 
to the type of the race more nearly than do the males. The latter show 
more markedly the traces of racial intermixture. 
The composite types for the Negro are made in the same manner as 
those for the Caucasian. 'The composite male and female are almost 
identical in shape, except that the splenium of the male is relatively 
larger than that of the female, just the opposite of what was found in the 
Caucasian. The cross section area in the male is altogether larger than 
in the female. Racia] differences are more marked. The cross section 
area of the corpus callosum is less in the Negro than in the Caucasian. 
The area of the posterior lineal half is relatively larger in the Negro, 
while the area of the anterior lineal half is relatively smaller. The 
