hypothetical.

Although Gall's attempt to locate the sexual instinct in the
cerebellum--well supported as it was by observations--is no
longer considered to be tenable, his discussion of the sexual
instinct was of great value, far in advance of his time, and
accompanied by a mass of facts gathered from many fields. He
maintained that the sexual instinct is a function of the brain,
not of the sexual organs. He combated the view ruling in his day
that the seat of erotic mania must be sought in the sexual
organs. He fully dealt with the development of the sexual
instinct in many children before maturity of the sexual glands,
the prolongation of the instinct into old age, its existence in
the castrated and in the congenital absence of the sexual glands;
he pointed out that even with an apparently sound and normal
sexual apparatus all sorts of psychic pathological deviations may
yet occur. In fact, all the lines of argument I have briefly
indicated in the foregoing pages--although when they were first
written this fact was unknown to me--had been fully discussed by
this remarkable man nearly a century ago. (The greater part of
the third volume of Gall's _Sur les Fonctions du Cerveau_, in the
edition of 1825, is devoted to this subject. For a good summary,
sympathetic, though critical, of Gall's views on this matter, see
Möbius, "Ueber Gall's Specielle Organologie," _Schmidt's
Jahrbücher der Medicin_, 1900, vol. 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