354 Or rue SILK-WORM. 
4. The dupions, or douple cocons, are focalled becaufe 
they contain fometimes two and fometimes three worms, 
who have jointly formed one fingle cocon. They inter- 
lace their threads, for which reafon they are to be kept 
afunder from the reft; they make the filk we call dupions. 
5. The foufflons are cocons very imperfect, whofe con- 
texture is loofe, fometimes to that degree that they are 
tranfparent, and bear the fame proportion to the others, 
as a gauze toa fattin. Thefe cannot be wound. 
6. The perforated cocons are {o called, becaufe they have 
a hole at one end, for which reafon they alfo cannot be - 
wound, 
7. The calcined cocons are thofe whole worm, after the 
formation of the cocon, is attacked with a ficknefs which 
fometimes petrifies it, and at others reduces it to a fine 
white powder, without in the leaft endamaying the filk; 
on the contrary, thefe cocons produce more filk than the 
others, becaufe the worm is confiderably lighter. They 
are to be diftinguifhed by the noife the petrified worm 
makes when you fhake the cocon. In Piedmont they fell 
for half as much again as the others. It is very rare to 
fee a parcel of 25/b. of them at a time: 63/b. of thefe 
cocons have produced 1/b, 1 0z. of fine filk of five to fix 
cocons. 
8. The good choquette confifts in thofe cocons whofe 
worm dies, before he has brought it to its perfection. 
They are to be known by the worms fticking to one fide 
of the cocon, which is eafily to be perceived when on 
fhaking it you do not hear the chrylalis rattle. Thefe 
cocons are of as fine filk as the others, but they are to be 
wound feparately becaufe they are fubjeCt to furze out, and 
the filk has not fo bright a colour, neither is it fo {trong 
and nervous. 
g. The bad choquette is compofed of defective cocons, 
fpotted or rotten. They wind many of thefe cocons to- 
gether. It makes a very foul bad qualified filk of a black- 
ith colour. Il. To 
