f which would
be reabsorbed; he is simply losing a fluid which would, in the natural
course of events, have passed away within the next few days as a
nocturnal emission.

These details have been explained in order that the young man may
fully understand the physiology of his sexual apparatus and not be
disturbed by the advertisements or the pamphlet literature of
charlatans who make a business of frightening young men into the
belief that in these experiences they are losing "vital fluid"--that
they are victims of "lost manhood," or that they are entering into a
condition of "general debility" and "impotence." As an actual fact,
involuntary loss of vital fluid (spermatorrhea), is a rare case even
in the practice of specialists in genito-urinary diseases, and in
these rare cases, the condition is usually a result of very great
excesses, sexual debauchery or one of the sequelae of venereal disease.
[Read: Appendix 1, 13 and 17.]

e. =Testes.= No rational idea of the physiology of the testes can be
given without laying down as a fundamental physiological law, that
_the testes secrete under sexual stimulation only_. This same general
principle applies to all glands, i.e., that they secrete only under
the influence of some special stimulation. In harmony with that law,
the testes secrete only under the influence of sexual stimulation.

The sexual stimulation may be sub-divided into two general categories,
i.e., conscious sexual stimulation and subconscious sexual
stimulation.

_Conscious sexual stimulation_ is partly psychical and partly
physical. The physical stimulation is produced by physical proximity
of a member of the opposite sex. The physical and psychical phases of
conscious sexual stimulation are so intimately interwoven that it is
exceedingly difficult to discuss one without constant reference to the
other, and it may be said in this connection that the psychical
attitude of the two individuals of opposite sex who are brought into
close physical proximity will modify very greatly their local sexual
responses.

Reverting to the lower animals: when a female in rut or heat is
brought into proximity to the male, there seems to be on the part of
each animal a consciousness of the character and attitude of the other
animal and both animals are step by step excited by various physical
contacts and probably also psychical conditions to a high state of
sexual excitement, leading to the natural ultimate result, coitu