with the ergograph are instructive from the present
point of view: “Although sensibility diminishes
in the course of fatigue,” Fere found that “there
are periods during which the excitability increases
before it disappears. As fatigue increases, the
perception of the intercurrent excitation is retarded;
an odor is perceived as exciting before it is perceived
as a differentiated sensation; the most fetid odors
arouse feelings of well-being before being perceived
as odors, and their painful quality only appears afterward,
or is not noticed at all.” And after recording
a series of results with the ergograph obtained under
the stimulus of unpleasant odors he remarks: “We
are thus struck by two facts: the diminution of
work during painful excitation, and its increase when
the excitation has ceased. When the effects following
the excitation have disappeared the diminution is more
rapid than in the ordinary state. When the fatigue
is manifested by a notable diminution, if the same
excitation is brought into action again, no diminution
is produced, but a more or less durable increase, exactly
as though there had been an agreeable excitation.
Moreover, the stimulus which appears painful in a
state of repose loses that painful character either
partially or completely when acting on the same subject
in a more and more fatigued state.” Fere
defines a painful stimulus as a strong excitation
which causes displays of energy which the will cannot
utilize; when, as a result of diminished sensibility,
the excitants are attenuated, the will can utilize
them, and so there is no pain. These experiments
had no reference to the sexual instinct, but it will
be seen at once that they have an extremely significant
bearing on the subject before us, for they show us
the mechanism of the process by which in an abnormal
organism pain becomes a sexual stimulant.
 Erasmus Darwin, Zooenomia, vol. i, p.
 K. Groos, Spiele der Menschen, pp. 200-210.
 Hirn, Origins of Art, p. 54. Reference
may here perhaps be made to the fact that unpleasant
memories persist in women more than in men (American
Journal of Psychology, 1899, p. 244). This
had already been pointed out by Coleridge. “It
is a remark that I have made many times,” we
find it said in one of his fragments (Anima Poetae,
p. 89), “and many times, I guess, shall repeat,
that women are infinitely fonder of clinging to and
beating about, hanging upon and keeping up, and reluctantly
letting fall any doleful or painful or unpleasant
subject, than men of the same class and rank.”
 Groos, Spiele der Thiere, p. 251.
Maeder (Jahrbuch fuer Psychoanalytische Forschungen,
1909, vol. i, p. 149) mentions an epileptic girl of
22 who masturbates when she is in a rage with anyone.
 Krafft-Ebing, Psychopathia Sexualis,
English translation of tenth edition, p. 78.