pends upon the knowledge to be born of the
researches into the vast possibilities of this idea. Man, the
Adventurer, the prey of Chance and Luck, will then become, indeed now
becomes, the Captain of Fate and Destiny.

It is, of itself, a revolution in the intellect, to conceive of
instincts and emotions, suggestibility and contra-suggestibility,
initiative and imitation, volitions and inhibitions as chemical
matters. In all their relations, mutually reacting effects and
defects, excesses and deficiencies, the internal secretions set up
psychic echoes and reflections. When morbid and their equilibrium
dislocated, we may even have phobias and neuroses.

A man's nature is essentially his endocrine nature. Primarily, when he
is born, he represents a particular inherited combination of different
glands of internal secretion. They, constituting the inventory of his
vital stock in trade, start him in life. Afterwards, food, the routine
of his existence, the accidents of experience, education, disease and
misfortune, in short, environment, modify him because they modify his
ductless glands and his vegetative apparatus, as well as his brain,
depressing some parts, and stimulating others, and so rearranging the
system. In particular will he be transformed as the gland is affected
which is the centre of the system to which the others adapt and
accommodate themselves. The inertia of the system is very great,
almost absolute, and always tends to return. If he has children, he
hands on his constellation of endocrines, in spite of mishaps, not at
all or only slightly transformed. Sometimes, however, the experiential
transformation has been sufficiently deep, and shaken the very
constitution of his germ-plasm. So family dispositions and traits,
national and racial temperaments, are propagated, maintained and
varied.

THE SEX INSTINCTS

Hormone reactions, as we have seen, initiate the complicated forces,
processes and expressions of sex. The dictum of the founder of modern
pathology, Virchow, that Woman was in effect an appendix to the
ovaries, has long been taken to apply to her psychic traits as well
as somatic. Her mind, like her skin, her hair and her pelvis, is a
product of the ovarian endocrines. But these determinations are by no
means her monopoly. Man is likewise a creation of the chemical wheels
within wheels and springs within springs that are his glands of
internal secretion. That he is not so obviously an appendix to h