( 1 2 35 ; 
mediately from the Arteries o{ the Mother mthout any 
mixture. And therefore I can't help canclading, that this 
opinion engages its favourers in fome Abfurdity, without 
Necefiity and without Proof. 
They that from the Vlacenta fupply the Body of the 
f(Btus with Air^ are as much diftrels'd as t'other, for they 
are forc'd to beg the queftion twice, which, even when 
granted, will not anfwer their ends. Firft, they fuppole, 
that an intimate mixture or confufion of J/r with the 
Bloody is neceffary for the fopport of Animal Life, a Vopi" 
to?^^, which perhaps the former part of this Difcoutfe may 
have render d unnecellary ^ and next that the Fi}3tus is fup- 
plied with Air from, and itsB/^?<?(^ mixt with it in 'the P/^^ 
€enta. 
But here again they fetch a Compafs without oeceility or 
proof. For if a mixture of Air were neceffary to a F(BtHs^ 
why fllould it be feparated from the Mothers Blood, 
and not rather both communicated together, fince it is fo 
much more eafie and commodious. But neither does the 
I^lacenU feem to beinftrufted and provided for the repara- 
tion of Air^ but of a much grojfer Fluids dcftin d to Tome 
other ufe, which Autopjie coxAxms. Yet were both thefe 
opinions true, they are however defeftive, and the Circular 
Motion of the Blood unprovided for. 
By the way of Transpfion this great Phsenomenon is 
naturally accounted for, and the ends, for which the o- 
ther two Hypothefes were devis'd, might both be anfwered 
with more eafe. For the Bjjlerick Arteries tranfmitting 
their Blood immediately to the Umbilicd Vein, may very 
ea(ily tranfmit (uch Nutritious Juices or Aerial Particles as 
are contain d in the Blood, along with it, without depofiting 
'em by the way. By this means fo much ot the Impulfe of 
the Mothers Blood is preferv'd, as fufEces to maintain that 
languid circulation, which a F^^^/^ en joys. For the Blood 
being dfiven thro' the Arteries of the Vterus into the Vm- 
bilical Veiny is convey 'd diredtly to the Sinus of the Vorta^ 
