. [ 209 ] 
vefTd, which I called the termination of the whole 
fydem, is very fmall, in proportion to the net-work 
from which it rifes j and indeed the lymphatics, at 
this part, are fo large as to exceed by far the fize of 
the fanguiferous vefiels. 
The thoracic du<fl of the left fide, having pafled 
under the cefophagus from the right, runs on the in- 
fide of the n)ena cava of the left fide, receives a branch 
from its fellow of the oppofite fide, and joins the 
large lymphatics which lie on the left of the pericar- 
diuniy and a part of thofe which lie behind the 
heart, and afterwards makes, together with the lym- 
phatics from the gills, upper fins, and fide of the 
filh, a net- work, from which a vefiel pafTes into the 
jugular vein of this fide. In a word, the lymphatics 
of the left fide agree exactly with thofe of the right, 
as above defcribed. 
Befides thefe veflels, there is yet another part of the 
lyftem which is deeper feated, lying between the roots 
of the fpinal procefies of the back-bone : this part con- 
fifts of a large trunk, that begins from the lower part 
of the fifh near the tail, and, as it afcends, receives 
branches from the dorfal fins, and from the adjacent 
parts of the body. It goes up near to the head, and 
fends a branch to each thoracic dudl, near the part 
where they come off from their common trunk. 
This defcription, though taken from a haddock, 
agrees, I believe, pretty exactly with the diftributioii 
of thofe vefTels in the cod, whiting, and perhaps all 
other fifii of the fame fhape. 
To this general defcription I (hall add what I have 
obferved of the more remarkable peculiarities of this 
fyfiem in fifh. 
VoL. LIX. E e III 
