Robert Bennett Bean 399 
Unmistakable evidences of a previous mixture of other races with the 
Negro exist. Three are mulattoes. Three are accident cases. The ma- 
jority are between the ages of 50 and 80 years. This type represents the 
higher and better class of the Guinea Coast Negro. 
Type IV is a composite of nine cases. The cross section of the corpus 
callosum is long, large, and highly arched, resembling Type V in the male 
Caucasian. The splenium is large and regular in outline, tapering off 
gradually in the isthmus and body, which are long, curved, and smaller 
than the splenium. The genu is of medium size and has a long pointed 
beak. The brains are large, heavy (1300 to 1500 grams), long 
(dolichocephalic), and high in the frontal region. The frontal lobes are 
comparatively large and the parietal region is massive and bulging. The 
bodies are in a well nourished condition. The average weight is 72 kilo. 
(158 pounds), the average height is 175 cm. (5 feet 9 inches), and the 
age varies from about 40 to 70 years. This represents the tall, fair- 
skinned Negro (or mulatto), of the enterprising nature, but the mest 
dangerous of all characters to human society. Rape and murder aitach 
themselves here. Two of them were murderers, four Mulattoes, and the 
others exhibit traits of considerable Caucasian intermixture. This type 
represents the Kaffir Negro, probably a mixture of Semitic (Arab), Ha- 
mitic, and Negro at a remote period of time, the Zulus being the charac- 
teristic tribe of the Kaffir Negro. 
Negro female types——There are four female Negro types, which corre- 
spond in general to the four male Negro types. These may be combined 
into two groups for the two sexes alike. The primary group, composed 
of Types I and II, is the prevalent Negro type, being purer Negro than 
the secondary group, composed of Types III and IV, which is largely 
mixed with Caucasian. 
Type I is a composite of five cases. The cross section of the corpus 
callosum is short, wide, and compact. The splenium, isthmus, body and 
genu are relatively of good size. The brain is small, short, and boxlike in 
appearance. The brain weight is from 1000 to 1100 grams. The frontal 
lobes are small, narrow from side to side and from above downward. The 
parietal region is large, full, and bulging. The subjects are about 160 
em. (5 feet 3 inches) average height, 50 to 54 kilo (110 to 120 pounds) 
average weight, and the age is from 20 to 30 years. They represent a 
class of young, stocky built, dark-skinned Negro women of the Guinea 
Coast Negro type. There is a trace of racial intermixture in some of 
them. 
Type II is a composite of three cases. The cross section of the corpus 
callosum is long, arched, and narrow. The splenium and venu are of 
