224 DESCRIPTION of a 
began on the fore-part of the belly above the navel, at the place 
where the fimall portion of the umbilical vein terminated in 
the cavity of the cutaneous button, from which various 
branches were fent into the kidney at its convex part, and from 
its concave part, different arteries, he fays, came out in an ex- 
traordinary manner *, 
Upon the whole, as the umbilical cord is not faid to have 
been uncommon in fize or ftructure; as there were two forts 
of veflels connected with the kidney ; as it is fo improbable, as 
to be incredible, that the foetus received arteries without corre- 
fponding veins, or that there was merely a protrufion of the 
humours, and exudation of them,.without circulation, I have 
no doubt that Wrnstow, efpecially as he did not inject the 
veffels of the umbilical cord, had miftaken the continuation of 
the umbilical veins, and the branches of the veflels he calls 
aorta, for branches of the fame veffel; and as the monfter he 
examined agreed very nearly, in all other refpects, with that I 
have defcribed, I apprehend it muft have°agreed likewife in 
having two kinds of ‘blood-veflels or arterious and venous Ca- 
nals. 
Tur learned Dr RorpERER rejects the opinion of Mery, 
that the blood of the foetus is circulated by the heart of the 
mother, and fuppofes, that capillary attraction, heat, and fome 
activity of the veffels, may contribute to its motion. But as 
he applies the term aorta, not to the continuation of the umbi- 
lical vein, but to the other principal veffel of the monfter, and 
defcribes 
* P. 602. ‘Ce tronc arteriel qui étoit comme.la portion inferieure de ]’aorte de- 
fcendante, au lieu de tenir la route naturelle en arriere le long des vertebres, i] en étoit 
ici trés eloigné. I] commencoit fur le devant du ventre au se du nombril, a Pen- 
droit ou fe terminoit la petite portion de la veine ombilicale. Il jettoit des branches 
dans la maffe du rein par..+....faconvexité. Hi fortoit de la concavité plufieurs 
artéres, 
7 
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