[ 2II ] 
analogy between fifli and the turtle ; but In fifli it is 
moie evident that there can be no deception as to the 
net' work between the mufcular and internal coats; 
for in them it is made up of cylindrical velTels, and is 
not cellular, as in the turtle, and therefore not in the 
lead: like an extravafation : and in fith the vefl'els on 
the internal coat are larger than in turtles. 
Fourthly, this fyftem agrees with that of the 
turtle, in having a very large receptaculum^ and in 
having the net- work of large velTels near its termina- 
tion in the fanguiferous lydem j and likewife in hav- 
ing the velTd, which goes from the net-work into the 
vein, fmall in proportion tothedzeof that net- work : 
fo that the lymph mud be lodged Tome time in thofe 
parts before it is poured into the mafs of blood. In 
birds I alfo obferved fomething like this, their 
lymphatic fydem being enlarged or varicofe at dif- 
ferent parts ; but thefe enlargements are fmall in pro- 
portion to thofe above mentioned in filh and turtle. 
As to the manner of difeovering thofe velTels in a 
filh, one might naturally fuppofe, that when we know 
where the receptaculiim^ or any of the larger parts of 
this lyftem lie, it could not be difficult to find them ; 
but the coats of thefe velTels are fo thin and tranf- 
parent, that it is by no means eafy. But the readied: 
way of finding the whole lydem is, to look for one 
of the velTels which lie clofe to the Ikin ; as, for in- 
ftance, that which runs up exadtiy on the middle of 
the belly of the haddock, cod, and other filh of the 
fame ffiape. This velTel is eafily feen as it grows 
pretty large where it palTes between the two jugular 
fins ; and if a pipe be introduced, the whole fyllem 
may be filled by means thereof. 
E e 2 
It 
