[ 2o6 ] 
thefe fifli j and, by injed:ing by this pipe, I found 
where the larger veffels lay ; after which there was 
but little difficulty in tracing the whole fyftem. ' I 
have now feen thofe veffels in a variety of fiffi, and 
ffiall give a defcription of them from a haddock. I 
fhall proceed exadly in the order which I have found 
moft convenient for tracing out the whole fyflem 
for demonftration, beginning with one of its branches, 
which, as lying nearell: the furface, muft, of courfe, 
be divided before the other parts can be expofed to 
view. The account being taken from the iiffi as it 
lay on its back, thofe parts are called fuperior which 
are neareft the head j thofe inferior, which are to- 
wards the tail, thofe pofterior which are towards the 
back, and thofe anterior which are towards the 
belly. 
On the belly of the fiffi, exadlly in the middle 
line, is a lymphatic, which runs from the anus up- 
wards ; this lymphatic belongs not only to the pa- 
rietes of the belly, but to the fin below the anus. It 
runs up' towards the head, pafles between the two 
jugular fins, and, having got above them, it receives 
their lymphatics. It then goes under the fymphyjis of 
the two bones which form the thorax y where it opens 
into a net-work of very large lymphatics, which lies 
clofe to pericardium y and almoft intirely furrounds 
the heart. This net- work, befides that part of it be- 
hind the heart, has a large lymphatic on each fide, 
which runs upon the bone of the thorax backwards, 
and when it has got as far as the middle of that bone, 
it fends off a large branch from its infide to join the 
thoracic dudt. After detaching this branch, it is 
joined by the lymphatics of the pedoral fins, and 
4 foon 
