PHYSICAL ann LITERARY. 433 
into the cavity of the womb; nay, a late 
learned author applies thefe names of finufes 
and canals, to the trunks and branches of the 
veins painted in A/binus’s 7th table of the 
gravid uterus. 
Tue exiftence of finufes and canals being 
thenimaginary, and the cavities which wehave 
defcribed under the name of finufes being in- 
tirely the creatures of impregnation, and not 
to be found in the wferus virgineus; or being 
at any rate, from the fize of their orifices, un- 
fit receptacles of the blood ;° we cannot {ure- 
ly account for the menfirual flux or any other 
pheenomenon from fuch a ftructure, 
As the finufes were filled by our courfe in- 
jection, thrown into the arteries, I imagined, 
that, by a careful diffleGtion, the openings of 
the arteries into them might poffibly be ob- 
ferved; but, I found more difficulty than I 
expected, from the fize and very large com- 
munications of moft of the fimu/es and veins. 
Near to the edges of the placenta, where 
they were not fo frequent, I was lucky e- 
nough to aifcover, with certainty, feveral ori- 
fices of arteries, fome of which were of a 
confiderable diameter, opening directly into 
the finufes: and fince none of the anatomifts 
| Tii have 
