This cycle manifests itself in all a
woman's activities, in metabolism, respiration, temperature,
etc., as well as on the nervous and psychic side. The healthier
the woman is, the less conscious is the cyclic return of her
life, but the cycle may be traced (as Hegar has found) even
before puberty takes place, while Salerni has found that even in
amenorrhoea the menstrual cycle still manifests itself in the
temperature and respiration. (_Rivista Sperimentale di
Freniatria_, XXX, fasc. 2-3.)
For a summary of the phenomena of the menstrual cycle, see
Havelock Ellis, _Man and Woman_, fourth ed., revised and
enlarged, Ch. XI; "The Functional Periodicity of Women." Cf.
Keller, _Archives Generales de Medecine_, May, 1897; Hegar,
_Allgemeine Zeitschrift fuer Psychiatrie_, 1901, Heft 2 and 3;
Helen MacMurchy, _Lancet_, Oct. 5. 1901; A.E. Giles,
_Transactions Obstetrical Society London_, vol. xxxix, p. 115,
etc.
_Mittelschmerz_ is a condition of pain occurring about the middle
of the intermenstrual period, either alone or accompanied by a
slight sanguineous discharge, or, more frequently, a
non-sanguineous discharge. (In a case described by Van Voornveld,
the manifestation was confined to a regularly occurring rise of
temperature.) The phenomenon varies, but seems usually to occur
about the fourteenth day, and to last two or three days.
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