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The chorion is an outward skin which compasseth the child in the womb. The amnios is the inner skin which compasseth the child in the womb. The alantois is the skin that holds the urine of the child during the time that it abides in the womb. The urachos is the vessel that conveys the urine from the child in the womb to the alantois. I now proceed to
The flesh of it is like that of the melt or spleen, soft, red and tending something to blackness, and hath many small veins and arteries in it: and certainly the chief use of it is, for containing the child in the womb. The second is the chorion. This skin and that called the amnios, involve the child round, both above and underneath, and on both sides, which the alantois does not.
The fourth, and last covering of the child is called amnios; and it is white, soft and transparent, being nourished by some very small veins and arteries. Its use is, not only to enwrap the child, but also to retain the sweat of the child.
When these waters come thus away, then the midwife may be assured the birth is very near, this being the most certain sign that can be; for the amnios alantois, which contained these waters, being broken by the pressing forward of the birth, the child is no better able to subsist long in the womb afterwards than a naked man in a heap of snow.
The less pure are cast to the outside, and with these seed is circled round and the membrane made, in which that seed that is most pure is wrapped round and kept close together, that it may be defended from cold and other accidents, and operate the better. The first thing that is formed is the amnios; the next the chorion; and they enwrap the seed round like a curtain.
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