character fitted to cope with the environment in which it was evolved.
This is clearly perceptible in regard to their bodily traits, and all
modern research seems to show that their native reactions to different
stimuli also vary greatly, that is, heredity affects their thoughts,
feelings and mode of conduct as well as the color of skin, texture of
hair, and shape of head. In other words, the instincts or native
reactions of the different races of man vary considerably in degree if
not in quality, and from this it follows that their feelings, ideas, and
modes of conduct must also vary considerably.

It may be noted, however, that taking racial heredity into full account
by no means leads to an attitude of fatalism as regards racial problems.
On the contrary modern biology clearly teaches that racial heredity is
modifiable both in the individual and in the race. It is modifiable in
the individual through education or training; it is modifiable in the
race through selection. Therefore racial heredity does not foredoom any
people to remain in a low status of culture; only it must be taken into
account in explaining the cultural conditions of all peoples, and
especially in planning for a people's social amelioration.

The Racial Heredity of the Negro.--It is generally agreed by
anthropologists and biologists that mankind constitutes but a single
species, developed from a single pre-human anthropoid stock. The various
races of mankind have had, therefore, a common origin, but having
developed in different geographical areas they each present certain
peculiar racial traits adapting each to the environment in which it was
developed. Now, the negro race is that part of mankind which was
developed in the tropics. In all the negro's physical and mental make-up
he shows complete adaptation to a tropical environment. The dark color
of his skin, for example, was developed by natural selection to exclude