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The want of mefenteric glands was another caufe of 
our remaining fo long ignorant of thofe veffels. 
This fyftem may be divided in birds, as it is in 
quadrupeds, into the branches, viz. the ladeals and 
lymphatics, and their trunk, or thoracic dud. The 
ladeals indeed, in the ftrided: fenfe, are, in birds, 
the lymphatics of the inteftines, and like the other 
lymphatics carry a tranfparent lymph. And inftead 
of one thoracic dud there are two, of which one goes 
to each jugular vein. In thefe circumftances it would 
feem, that birds differ from quadrupeds, fo far at 
lead; as I may judge from the diffedion of a goofe, 
which was the bird I chofe as mod; proper for this 
enquiry. 
So much being premifed, I fhall next give a de- 
fcription of what I have feen of thofe veffels in this 
fowl ; and to illudxate the defcription I fhall add a 
figure from the fame fubjed, in which thofe veffels 
were filled with quick-filver. 
The ladeals run from the intedines upon the me- 
fenteric veffels. Thofe of the duodenum faj* pafs by 
the fide of the pancreas (QJ -f*, and probably receive 
its lymphatics : afterwards they get upon the cceliac 
artery, of which the fuperior mefenteric is a branch. 
Whild they are upon this artery they are joined by the 
lymphatics from the liver (bj: here they form a plexus, 
which furrounds the cceliac artery (cc ) ; at this part 
they receive a lymphatic from the gizzard (d) ; and a 
little farther, another from the lower or glandular part 
of th zcefophagus ( e ). Having now got to the root of the 
cceliac artery, they are joined by the lymphatics from 
the renal capful 'a ; and near the fame part, by the 
* See Plate X. in the outlines. 
t See the fame Plate in the Figure itfclf. 
ladeals 
