At the age of 14, the menses, in virgins, begin to flow; then they are capable of conceiving, and continue generally until 44, when they cease bearing, unless their bodies are strong and healthful, which sometimes enables them to bear at 65.  But many times the menses proceed from some violence done to nature, or some morbific matter, which often proves fatal.  And, hence, men who are desirous of issue ought to marry a woman within the age aforesaid, or blame themselves if they meet with disappointment; though, if an old man, if not worn out with diseases and incontinency, marry a brisk, lively maiden, there is hope of him having children to 70 or 80 years.

Hippocrates says, that a youth of 15, or between that and 17, having much vital strength, is capable of begetting children; and also that the force of the procreating matter increases till 45, 50, and 55, and then begins to flag; the seed, by degrees, becoming unfruitful, the natural spirits being extinguished, and the humours dried up.  Thus, in general, but as to individuals, it often falls out otherwise.  Nay, it is reported by a credible author, that in Swedland, a man was married at 100 years of age to a girl of 30 years, and had many children by her; but his countenance was so fresh, that those who knew him not, imagined him not to exceed 50.  And in Campania, where the air is clear and temperate, men of 80 marry young virgins, and have children by them; which shows that age in them does not hinder procreation, unless they be exhausted in their youths and their yards be shrivelled up.

If any would know why a woman is sooner barren than a man, they may be assured that the natural heat, which is the cause of generation, is more predominant in the man than in the woman; for since a woman is more moist than a man, as her monthly purgations demonstrate, as also the softness of her body; it is also apparent that he does not much exceed her in natural heat, which is the chief thing that concocts the humours in proper aliment, which the woman wanting grows fat; whereas a man, through his native heat, melts his fat by degrees and his humours are dissolved; and by the benefit thereof are converted into seed.  And this may also be added, that women, generally, are not so strong as men, nor so wise or prudent; nor have so much reason and ingenuity in ordering affairs; which shows that thereby the faculties are hindered in operations.

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CHAPTER II

     How to beget a male or female child; and of the Embryo and perfect
     Birth; and the fittest time for the copula.