C 12 ] 
this, that they beat the bone upon a block with 
a thick dick, till the pockets, as they term them,, 
come out eafily, and thus preierve the found entire*. 
If the founds have been cured with fait, that mud 
be diffolved by deeping them in water, before they 
are prepared for ifinglafs the frefh found mud then 
be laid upon a block of wood, whofe furface is a 
little elliptical, to the end of which a fmall hair 
brufh is nailed, and with a * fa w- knife, the mem- 
branes on each fide of the found mud be fcraped 
off. The knife is rubbed upon the brudi occafionally, 
to clear its teeth ; the pockets are cut open with 
fcillars, and perfectly cleanfed of the mucous matter 
with a coarfe cloth : the founds are afterwards wadied 
a few minutes in lime-water, in order to abforb their 
oily principle, and ladly in clear water. They are 
then laid upon nets, to dry in the air j but, if in- 
tended to refemble foreign ifinglafs, the founds of 
cod will only admit of that called book, but thofe of 
ling both diapes. The thicker the founds are, the-- 
better the ifinglafs, colour excepted ; but that is im- 
material to the brewer, who is its chief confumer. 
This ifinglafs refolves into fining, like the other 
forts, in fubacid liquors, as dale beer, cyder, old 
hock, &c. and in equal quantities produces fimilar 
effects upon turbid liquors, except that it falls- 
fpeedier and clofer to the bottom of the veffel, as 
may be demondrated in tall cylindrical glades ; but 
foreign ifinglafs retains the confiflency of fining pre- 
ferably in warm weather, owing to the greater te- 
nacity of its native mucilage. 
Vegetable 
* See Fig. a. 
