2 
396 Some Racial Peculiarities of the Negro Brain 
placing them over each other so that they coincide throughout as much as 
possible. The heaviest resulting outline is taken as the composite. Then 
the types are combined for each race in the same way, and finally the 
race types are combined. The types are represented in Figures 12 to 16. 
The type of brain varies with the type of corpus callosum, and the type 
of individual varies likewise. 
Caucasian male type.—There are five types of the corpus callosum in 
the Caucasian male, but these may be brought together into two groups. 
Types I, II and IV belong to the primary group, and Types III and V 
to the secondary group. The primary group represents the young and 
vigorous, the secondary represents the old and infirm. 
The corpus callosum representing Type I is a composite of eight cases. 
It is large in cross section, and every part is full and well developed. The 
splenium is of moderate size, the isthmus is not small, the body and genu 
are large and heavy. The type of brain to which this belongs is large, 
heavy (1400-1500 grams), and well rounded in all its outlines, approach- 
ing the dolichocephalic in shape. The frontal and temporal regions are 
large, the parietal and occipital regions are relatively not so large. The 
bodies from which these brains are taken are of men in the prime of life, 
from 40 to 50 years of age, and in apparently good physical condition, 
death coming rapidly or suddenly (pneumonia, heart disease, nephritis, 
galloping consumption, or accident), without great emaciation. The avy- 
erage height is 184 cm. (6 feet, $ inch), and the average weight is 73 
kilo. (161 pounds). There is evidence of average intelligence and in- 
dividuality among these men. One was manager of a livery stable, another 
was an eccentric man who became alienated from his family on Long 
Island and wandered off with considerable money, drifted to Baltimore 
and died in the Bay View Pauper Asylum, while a third was the victim 
of a third-rail accident, and apparently a man of affairs. Two are noted 
as “blonde.” 'The others are not described as to color. 
Type II is a composite of seven cases. The cross section of the corpus 
callosum is longer and narrower than in Type I. The splenium is large, 
the isthmus is small, the body is of medium size, and the genu is large. 
The brains representing this type are of medium size (1300-1500 grams), 
high and narrow (dolichocephalic), and the outlines are squared—not so 
rounded as in Type I. The frontal and parietal regions are large, the 
temporal is of fair size, and the occipital hangs low and is long. The 
bodies from which these brains were removed were in a well nourished 
condition, death having resulted rapidly (pneumonia, nephritis, etc.) 
The men were in the prime of life—approaching old age, 40 to 60 years 
old, with an average height of 172 em. (5 feet 8 inches) and an average 
