Then the womb, or place of conception, is to be considered. It ought to be clean and sound, dry and soft, not retracted or drawn up; not prone or descending downward; nor the mouth thereof turned away, nor too close shut up. But to speak more particularly:-- The first parts to be spoken of are the _pudenda_, or privities, and the womb; which parts are shut and enclosed either by nature or against nature; and from hence, such women are called _imperforate_; as in some women the mouth of their womb continues compressed, or closed up, from the time of their birth until the coming down of their courses, and then, on a sudden, when their terms press forward to purgation, they are molested with great and unusual pains. Sometimes these break of their own accord, others are dissected and opened by physicians; others never break at all, which bring on disorders that end in death. All these _Aetius_ particularly handles, showing that the womb is shut three manner of ways, which hinders conception. And the first is when the _pudenda_ grow and cleave together. The second is, when these certain membranes grow in the middle part of the matrix within. The third is, when (though the lips and bosom of the _pudenda_ may appear fair and open), the mouth of the womb may be quite shut up. All which are occasions of barrenness, as they hinder the intercourse with man, the monthly courses, and conception. But amongst all causes of barrenness in women, the greatest is in the womb, which is the field of generation; and if this field is corrupt, it is in vain to expect any fruit, be it ever so well sown. It may be unfit for generation by reason of many distempers to which it is subject; as for instance, overmuch heat and overmuch cold; for women whose wombs are too thick and cold, cannot conceive, because coldness extinguishes the heat of the human seed. Immoderate moisture of the womb also destroys the seed of man, and makes it ineffectual, as corn sown in ponds and marshes; and so does overmuch dryness of the womb, so that the seed perisheth for want of nutriment. Immoderate heat of the womb is also a cause of barrenness for it scorcheth up the seed as corn sown in the drought of summer; for immoderate heat burns all parts of the body, so that no conception can live in the womb. When unnatural humours are engendered, as too much phlegm, tympanies, wind, water, worms, or any other evil humour abounding contrary to nature, it causes barrenness as do all terms not coming down in due order. A woman may also have accidental causes of barrenness (at least such as may hinder her conception), as sudden frights, anger, grief and perturbation of mind; too violent exercises, as leaping, dancing, running, after copulation, and the like. But I will now add some signs, by which these things may be known. If the cause of barrenness be in the man, through overmuch heat in the seed, the woman may easily feel that in receiving it.