[ 10 ] 
wards ; and, in order to preferve the * fhape of the 
three obtufe angles thus formed, a piece of round 
Hick, about a quarter of an inch diameter, is fattened 
in each angle with fmall wooden pegs, in the fame 
manner as the ends. In this ttate, it is permitted 
to dry long enough to retain its form, when the pegs 
and flicks are taken out, and the drying completed; 
laftly, the pieces of ifinglafs are colligated in rows, 
by running packthread through the peg-holes, for 
convenience of package and exportation. 
The membranes of the •f* book fort, being thick 
and refra&ory, will not admit a fimilar formation 
with the preceding : the pieces therefore, after their 
fades are folded inwardly, are bent in the center, in 
fuch manner that the oppofite fides referable the 
cover of a book, from whence its name ; a peg 
being run acrofs the middle, fattens the fides toge- 
ther, and thus it is dried like the former. This 
fort is interleaved, and the pegs run acrofs the ends,, 
the better to prevent its unfolding. 
That called cake iiinglafs is formed of the bits 
and fragments of the ftaple forts, put into a flat 
metalline pan, with a very little water, and heated 
juft enough to make the parts cohere like a pan- 
cake, when it is dried ; but frequently it is over- 
heated, and fuch pieces, as before obferved, are ufelefs 
in the bufinefs of fining. Experience has taught the 
confumers to reject them. 
Ifinglafs is beft made in the fummer, as froft gives 
it a difagreeable colour, deprives it of weight, and 
* See Fig.. 3 » 
f Fi®* 4* 
5 
impairs 
