328 Mr. cheston’s Account of an 
palling off of the coeliac artery to where it bifurcates into 
the two iliacs. 
On railing the aorta from the fpine, after I had di- 
vided it at its curvature, I found a lingular firmnefs on its 
right fide, like a piece of hard pack-thread, and exactly 
in the lituation of the thoracic du<£t. I continued my 
difledtion therefore with great caution, and at fuch an 
extent as to take in the vena azygos, and afterwards 
found upon clearing it at my leifure, that it really was 
the thoracic du£t, intirely plugged up with offific matter, 
from immediately above the receptaculum chyli. 
Unfortunately, being much llreightened for time 
when I opened the body, I was obliged to take out the 
parts for a more careful examination at home, which de- 
prived me of the opportunity of afcertaining the above 
circumftances at the time I feparated the parts, and con- 
fequently of inquiring how much further up this lingu- 
lar oflification extended, and in what Hate the duft might 
be at its entrance into the fub-clavian vein. The vena 
azygos, as well as the aorta, was perfectly found. 
The vena cava was not fo free from difeafe ; for though 
it bore externally a natural appearance, when I laid it open 
from finding a lingular feel within, I found that its ca- 
vity was above half filled with-a firm inelaftic fubftance : 
this 
