434 ESSAYS ann OBSERVATIONS 
have painted or defcribed thefe openings, tho’, 
in the imaginary ftructure of the /iu/es, they 
are {uppofed ; I have caufed a few of the 
moft diftiné&t to be reprefented in Tas. 7. 
fig. 7. where A reprefents the inner furface 
of the womb, to which the edge of the 
placenta had been fixed ;—bb, two {mall arte- 
ries appearing after having pierced the muf- 
cular fubftance ;—ccd, their ferpentine and 
{piral turns ;—/5, their openings into the fiuu- 
fes ; which were plain beyond difpute, when 
the wax was taken out of the /zus, and the 
artery gently preffed, the /imus being again 
in part filled from it, as is reprefented at - 
fi w. Nay, it is evident, that the arteries had 
communications with the /u/cs alfo in my bro- 
ther’s fubject ; fince the placenta was covered 
over with the extravafated oil of turpentine 
and vermilion, which was injected into the 
aorta defcendens; and which therefore feems 
to have filled the /inu/es, but to have been 
thruft out of them by the coarfe green injec- 
tion afterwards thrown into the veins.—ee, 
finall arteries which were obferved every 
where opening upon the internal membrane 
of the womb ;—/f, others which feem to 
have been torn in feparating the placenta.— 
And 
