cclxvii; also _Ausgewahlte
Werke_, vol. vii.)
It will be seen that the question of the nature of the sexual impulse has
been slowly transformed. It is no longer a question of the formation of
semen in the male, of the function of menstruation in the female. It has
become largely a question of physiological chemistry. The chief parts in
the drama of sex, alike on its psychic as on its physical sides, are thus
supposed to be played by two mysterious protagonists, the hormones, or
internal secretions, of the testes and of the ovary. Even the part played
by the brain is now often regarded as chemical, the brain being considered
to be a great chemical laboratory. There is a tendency, moreover, to
extend the sexual sphere so as to admit the influence of internal
secretions from other glands. The thymus, the adrenals, the thyroid, the
pituitary, even the kidneys: it is possible that internal secretions from
all these glands may combine to fill in the complete picture of sexuality
as we know it in men and women.[16] The subject is, however, so complex
and at present so little known that it would be hazardous, and for the
present purpose it is needless, to attempt to set forth any conclusions.
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