Obstetrics : the science and the art . ion, it isclear that the umbilical vesiclelies outside of the amnion andinside of the chorion within aspace which, perhaps, mightbe properly called the allan-toidal space. There is nodoubt of the normal existenceof this allantois or allantoidesfor the birds and the mam-miferous quadrupeds; but asto man it is much questioned,and, as I have said above, itcannot be demonstrated thatthere is a sac that may bedissected out, existing be-twixt the amnion and cho-rion. Noortwycks fine dis-sertation upon it towards theend of his volume, UteriHumani Gravidi Anatome
Obstetrics : the science and the art . ion, it isclear that the umbilical vesiclelies outside of the amnion andinside of the chorion within aspace which, perhaps, mightbe properly called the allan-toidal space. There is nodoubt of the normal existenceof this allantois or allantoidesfor the birds and the mam-miferous quadrupeds; but asto man it is much questioned,and, as I have said above, itcannot be demonstrated thatthere is a sac that may bedissected out, existing be-twixt the amnion and cho-rion. Noortwycks fine dis-sertation upon it towards theend of his volume, UteriHumani Gravidi Anatome et/•/a, 4to. 17-43, appearsto me to settle the question :in his criticism on Walter Needhams views of the sac, Noortwyck shows that it is indifferentwhether there be a sac or no, for the spare between the chorion amiamnion is to all intents and purposes a true and sufficient all;,one in which the urine of the early foetus can be discharged, aswell known to be in the allantois of the bird, in which urinous con-cretions may be 218 PREGXAXCY. t all, the Student may rest satisfied upon the point, in so far asto understand that an allantois is a urinary bladder constricted in themiddle, like an hour-glass; the narrow neck being the urachus; theinterior sac being the ordinary bladder of urine, and the one lyingbetwixt the chorion and amnion the real allantois. The embryo has now established its connection with the parent: ithas surrounded itself with its amniotic membrane, which fills with theliquor amnii in which the new being is suspended. As its umbilical cord comes out of the abdomen nearest the pelvicextremity of the embryo, it hangs suspended with its head downwardswhenever the woman is in a sitting or standing posture. It is truethat the cord lengthens daily, and sometimes attains the length ofsix feet, although inclosed in a womb never more than twelve incheslong. With such a great length, or even with a cord of eighteeninches long, it can no longer be said to be s
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