(1237) 
fince evVy one oi thefe Cotyledones, or ZJterwe Glandnks^ is 
in all refpefts a little Placenta^ and all the difference be- 
tween 'em is in number, name^ and magnitude. Why Rh- 
mimnts differ in this particular from other Vtvlparous Ani- 
mals, is befide the fubjeft of our prefent Enquiry. But the 
great Flux of Blood which conftantly follows upon draw- 
ing the PUcentd from Women (which is frequently fo 
great as to coft em their Lives) is a? plain a demonftratioa 
to Reafon of the Continuity of the Veffels, as Mr Cowpeys. 
Experiment is to the Eye. 
I have heard it objefted by very learned men, that if 
there were fuch a Continuity of Veffels, and fuch Transfufon 
of Blood, the F(etus muft neceffarily perifh thro lofs of 
Blood, upon the feparation of the Placenta from the Ute- 
rus^ but that on the contrary no vifible flux of Blood does 
follow while the F^ius continues wrapt iin the Membrane,, 
in which condition it may be kept alive fome hours. To ^ 
this it may be anfwer'd, that the Circulation in the Fi^tus 
being deriv'd from the Mother, may be fuppos'd wholly 
to ceafe upon the cutting off the communication between 
'em, till it is again renew*d more forcibly by refpiration. 
But if we allow the Motion . already imprefsd upon the 
Blood to be fufficient to keep it going a little while, ^yet k 
muft needs be fo exceeding languid, that the meet refiftance 
of the external Air muft be more than enough to hinder any 
Efflux of Blood from a F(etuf before Kefpiration. How long 
Life may be.preferv'd without an a^ual Circulation of the 
Blood, is a queftion not of this place. But we have been 
convinced by many and notorious Obfervations and Experi- 
ments, that Life has been recovered a long time after all to- 
kens of Refpiration, Circulation, or even Life it felf have 
difappear'd, fo that we can't think the firft folution either 
imppffible or improbable. 
texpeft to be told, that in the early days of Gejhilon in 
Viviparous Animals there is no Placenta, or any Adhefionof 
the Umbilical Veftels to any part of the Mother', and confe* 
quently no fuch Transfujion 5 and that in Oviparous there is 
