3. A nervous or sinewy production is led from the bottom of the bladder of the infant to the navel, and this is called _urachos_; and its use is to convey the urine of the infant from the bladder to the alantois. Anatomists do very much vary in their opinions concerning this; some denying any such thing to be in the delivery of the woman; and others, on the contrary, affirming it: but experience has testified there is such a thing; for Bartholomew Carbrolius, the ordinary doctor of anatomy to the College of Physicians at Montpelier, in France, records the history of a maid, whose water, being a long time stopped, at last issued out through the navel. And Johannes Fernelius speaks of the same thing that happened to a man of thirty years of age, who, having a stoppage at the neck of the bladder, his urine issued out of his navel many months together, and that without any prejudice at all to his health; which he ascribes to the ill lying of his navel whereby the urachos was not well dried. And Volchier Coitas quotes such another instance in a maid of thirty-four years of age, at Nuremberg, in Germany. These instances, though they happen but seldom, are sufficient to prove that there is such a thing as an urachos in men. These four vessels before-mentioned, viz. one vein, two arteries, and the urachos, do join near to the navel, and are united by a skin, which they have from the chorion, and so become like a gut or rope, and are altogether void of sense, and this is that which women call the navel-string. The vessels are thus joined together, that so they may neither be broken, severed nor entangled; and when the infant is born are of no use, save only to make up the ligament which stops the hole of the navel, and some other physical use, &c. _Of the_ SECUNDINE, _or After-Birth_. Setting aside the name given to this by the Greeks and Latins, it is called in English by the name of secundine, after-birth, or after-burden; which are held to be four in number. I. The _first_ is called placentia, because it resembles the form of a cake, and is knit both to the navel and chorion, and makes up the greatest part of the secundine, or after-birth. 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. 2. 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 doth not. This skin is that which is most commonly called the secundine, as it is thick and white, garnished with many small veins and arteries, ending in the placentia before named, being very light and slippery. Its use is not only to cover the child round about, but also to receive and safely bind up the roots of the veins and arteries or navel vessels before described.