psychic traits, are dominated largely by his internal secretions. All
normal as well as abnormal individuals are classifiable according to
the internal secretions which rule in their make-up. Individuals,
families, nations and races show definite internal secretion traits,
which stamp them with the quality of difference. The internal
secretion formula of an individual may, in the future, constitute his
measurement which will place him accurately in the social system.

"More and more we are forced to realize that the general form and
external appearance of the human body depends, to a large extent,
upon the functioning, during the early developmental period, of the
endocrine glands. Our stature, the kinds of faces we have, the
length of our arms and legs, the shape of the pelvis, the color and
consistency of the integument, the quantity and regional location
of our subcutaneous fat, the amount and distribution of hair on our
bodies, the tonicity of our muscles, the sound of the voice, and
the size of the larynx, the emotions to which our exterior gives
expression. All are to a certain extent conditioned by the
productivity of our glands of internal secretion." (Llewellys F.
Barker, Johns Hopkins University, 1st President of Association for
Study of Internal Secretions.)

The implications for the statesman, the educator, the vocational
expert, the student of the neurotic and of genius, of delinquents,
deficients and criminals, the explorers of the exceptional and the
commonplace, the understanding of the poetic and kinetic, base and
dull types, as well as of those two master interests of mankind, Sex
and War, are manifest. The mystery of the individual, in all his
distinct uniqueness, begins to be penetrated. And so every phase
of social life, in which the individual is at bottom the final