as the Slav and Latin
are different: because of differences in internal secretion make-up.
The Slav peasant is definitely subthyroid in his general effect:
round head, coarse features, stubby hands, and his stolid, brooding
intellectual and emotional reaction. The Latin shows a pronounced
adrenal streak in his coloration, his emotivity, his susceptibility to
neurosis and psychosis. H. Laing Gordon, a Scot physician, reported
that of 700 cases he studied, more than twice as many of duplex eyed
individuals (brown or black, i.e., adrenal-centered most often), were
susceptible to the mental disturbances of war as the simplex (blue or
gray-eyed, i.e., thyroid-centered most often). He also pointed out
that such individuals tend to have a narrow and abnormally arched
palate. The Anglo-Saxon tends to be more sharply pituitarized, his
features are more clean-cut, his mentality more stable. The Frenchman
is rather a cross between the Anglo-Saxon pituitary-centered and the
Italian or Spanish adrenal-centered.

So national resemblances, traceable to climatic influences being
repeated from generation to generation upon the endocrines, may be
explained physiologically. The physiologic interpretation of history
will indeed be found the broadest, including as complementary Buckle's
climatic theory, Hegel's ideas on the influence of ideas, and Marx's
on the superiority of the economic motives and forces.

THE RACES OF MANKIND

Arthur Keith, conservator of the Museum of the Royal College of
Surgeons of England, was the first to apply the principle of endocrine
differentiation to the problem of the color-lines--the lines which
have divided mankind crudely into the yellow, the red, the white and
the brown, the Negro, the Mongol, the Caucasian, the copper tinted
American. It has long been recognized by anthropologists that the
differences of color march with differences in every comparable trait.
Thus the ideal Negro is built upon a pattern in which all the elements
are specific and singular. When the looms revolve that make him,
there is produced a gleaming black skin, kinky black hair, squat
wide-nostriled nose, thick protruding lips, large striking teeth,
prominent jaws, and staring eyes. As his upright carriage and
bone-muscle-fat proportions are distinctive, so are his musical voice
and his easily wrought upon nerves. In contrast the Caucasian has a
good deal of hair on his body, his skin is a pale tan-pink, his lips
are thin, and