The length, breadth and thickness of the womb differ according to the age and disposition of the body. For in virgins not ripe it is very small in all its dimensions, but in women whose terms flow in great quantities, and such as frequently use copulation, it is much larger, and if they have had children, it is larger in them than in such as have had none; but in women of a good stature and well shaped, it is (as I have said before), from the entry of the privy parts to the bottom of the womb usually about eight inches; but the length of the body of the womb alone, does not exceed three; the breadth thereof is near about the same, and of the thickness of the little finger, when the womb is not pregnant, but when the woman is with child, it becomes of a prodigious greatness, and the nearer she is to delivery, the more the womb is extended. It is not without reason then, that nature (or the God of Nature) has made the womb of a membranous substance; for thereby it does the easier open to conceive, is gradually dilated by the growth of the foetus or young one, and is afterwards contracted or closed again, to thrust forth both it and the after-burden, and then to retire to its primitive seat. Hence also it is enabled to expel any noxious humours, which may sometimes happen to be contained within it. Before I have done with the womb, which is the field of generation, and ought, therefore, to be the more particularly taken care of (for as the seeds of plants can produce no plants, nor sprig unless grown in ground proper to excite and awaken their vegetative virtue so likewise the seed of man, though potentially containing all the parts of the child, would never produce so admissible an effect, if it were not cast into that fruitful field of nature, the womb) I shall proceed to a more particular description of its parts, and the uses for which nature has designed them. The womb, then, is composed of various similar parts, that is of membranes, veins, arteries and nerves. Its membranes are two and they compose the principal parts of the body, the outermost of which ariseth from the peritoneum or caul, and is very thin, without it is smooth, but within equal, that it may the better cleave to the womb, as it is fleshier and thicker than anything else we meet with within the body, when the woman is not pregnant, and is interwoven with all sorts of fibres or small strings that it may the better suffer the extension of the child, and the water caused during pregnancy, and also that it may the easier close again after delivery.