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indiscriminate endowment of procreation.
 On the scientific side, in addition to the fruitful methods of
statistical biometrics, which have already been mentioned, much promise
attaches to work along the lines initiated by Mendel; see W. Bateson,
_Mendel's Principles of Heredity_, 1909; also, W.H. Lock, _Recent Progress
in the Study of Variation, Heredity, and Evolution_, and R.C. Punnett,
_Mendelism_, 1907 (American edition, with interesting preface by Gaylord
Wilshire, from the Socialistic point of view, 1909).
 The study of the right conditions for procreation is very ancient.
In modern times we find that even the very first French medical book in
the vulgar tongue, the _Regime du Corps_, written by Alebrand of Florence
(who was physician to the King of France), in 1256, is largely devoted to
this matter, concerning which it gives much sound advice. See J.B.
Soalhat, _Les Idees de Maistre Alebrand de Florence sur la Puericulture_,
These de Paris, 1908.
 Hesiod, _Works and Days_, II, 690-700.
 This has long been the accepted opinion of medical authorities, as
may be judged by the statements brought together two centuries ago by
Schurig, _Parthenologia_, pp. 22-25.
 The statement that, on the average, the best age for procreation in
men is before, rather than after, forty, by no means assumes the existence
of any "critical" age in men analogous to the menopause in women. This is
sometimes asserted, but there is no agreement in regard to it. Restif de
la Bretonne (_Monsieur Nicolas_, vol. x, p. 176) said that at the age of
forty delicacy of sentiment begins to go. Fuerbringer believes (Senator and
Kaminer, _Health and Disease in Relation to Marriage_, vol. i, p. 222)
that there is a decisive turn in a man's life in the sixth decade, or the
middle of the fifth, when desire and potency diminish. J.F. Sutherland
also states (_Comptes-rendus Congres International de Medecine_, 1900,
Section de Psychiatrie, p. 471) that there is, in men, about the
fifty-fifth year, a change analogous to the menopause in women, but only
in a certain proportion of men. It would appear that in most men the
decline of sexual feeling and potency is very gradual, and at first
manifests itself in increased power of control.
 See, in vol. i, the study of "The Phenomena of Sexual Periodicity."
 Among animals, also, spring litters are often said to be the best.
 Bossi's results are summarized in _Archives d'Anthropologie
Criminelle_, Sept., 1891. Alebrand of Florence, the French King's
physician in the thirteenth century, also advised intercourse a day after
the end of menstruation.
"The work that I was born to do is done," a great poet wrote when at last
he had completed his task. And although I am not entitled to sing any
_Nunc dimittis_, I am well aware that the task that has occupied the best
part of my life can have left few years and little strength for any work
that comes after. It is more than thirty years ago since the first resolve
to write the work now here concluded began to shape itself, still dimly
though insistently; the period of study and preparation occupied over
fifteen years, ending with the publication of _Man and Woman_, put forward
as a prolegomenon to the main work which, in the writing and publication,
has occupied the fifteen subsequent years.
It was perhaps fortunate for my peace that I failed at the outset to
foresee all the perils that beset my path. I knew indeed that those who
investigate severely and intimately any subject which men are accustomed
to pass by on the other side lay themselves open to misunderstanding and
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