[ m 1 
as appears in the Subject B: bat in this Subject 
A y it only fends a fmaii Canalis art erio fits y y, 
into the inferior Aorta C. 
(2, A thick common Trunk of the pulmonary Ar- 
tery and the inferior Aorta. The latter plainly 
appears a Continuation of this Trunk ; whereas it 
is commonly a Continuation of the Aorta, a, <D: 
and the pulmonary Artery, /3, E-> only furnifhes 
the Aorta y cc, y, C, which makes but one Canal 
in ordinary Subjeds, with a Canalis arteriofuSyOi 
Canal of Communication ;(See Fig. f. in the 
Subject B), And indeed I am of Opinion, that 
this Structure, which feems extraordinary, is na- 
tural to every Foetus that is not far advanced, as I 
explain it in my Courfe of Phyfiology under the 
Article of the Foetus and that it is a Confe- 
quense and Proof of the mechanical and fuccef- 
five Formation of the Organs of its Circulation, 
which begins by the lower Circle made by the 
umbilical Vein, as the fir ft Mover ; the Trunk of 
the Vena cava , the inferior Aorta , and the 
Branches of the Vena cava, which correfpond 
with it. Now the Subjed A had feveral Marks, 
which demonftrated that its Formation was lefs 
advanced than that of the Subject B. 
re,#,#, T\\zOefophagus of each Subjed. 7T, The 
Windpipe. 
R , The Spleen, S, the Stomach of the Subjed A. 
V y The Liver, which feems to belong to the Sub- 
ject B. 
Under them the great and fmall Inteftines. 
K, The umbilical Vein of the Subjed Ay through 
which having made an Injection, the whole Liver 
U u u was 
