It would be a weak Objection, to alledge, That the Observation and Experiment being made on the _Uterus_ of a _Cow_, the Inference would not hold from thence to a _Woman_, the one being _Glanduliferous_, and the other _Placentiferous_; since every one of these _Cotyledones_, or _Uterine Glandules_, is in all respects a little _Placenta_, and all the difference between them is in number, name, and magnitude. Why _Ruminants_ differ in this Particular from other _Viviparous_ Animals, is beside the Subject of our present Enquiry. But the great Flux of Blood, which constantly follows upon drawing the _Placenta_ from Women (which is frequently so great as to cost them their Lives) is as plain a demonstration to Reason of the _Continuity_ of the Vessels, as Mr. _Cowper_'s Experiments is to the Eye. I have heard it objected by very Learned Men, that if there were such a _Continuity_ of Vessels, and such _Transfusion_ of Blood, the _Fœtus_ must necessarily perish through loss of Blood, upon the separation of the _Placenta_ from the _Uterus_; but that, on the contrary, no visible Flux of Blood does follow while the _Fœtus_ continues wrapt in the Membrane, in which Condition it may be kept alive some Hours. To this it may be answer'd, that the Circulation in the _Fœtus_, being deriv'd from the Mother, may be suppos'd wholly to cease upon the cutting off the Communication between them, till it is again renew'd more forcibly by _Respiration_. But if we allow the motion already impress'd upon the Blood to be sufficient to keep it going a little while; yet it must needs be so exceeding languid, that the meer resistance of the External Air must be more than enough to hinder any Efflux of Blood from a _Fœtus_ before Respiration. How long Life may be preserv'd without an _actual_ Circulation of the Blood, is a Question not of this place. But we have been convinc'd by many and notorious Observations and Experiments, that Life has been recover'd a long time after all tokens of Respiration, Circulation, or even Life it self, have disappear'd; so that we can't think the first Solution either impossible or improbable. I expect to be told, that in the early Days of _Gestation_ in _Viviparous_ Animals, there is no _Placenta_, or any Adhesion of the _Umbilical_ Vessels to any part of the _Mother_, and consequently no such _Transfusion_; and that in _Oviparous_ there is no _continuity_, or _communication_ of Vessels of any kind, during the whole time of _Incubation_.