‘Or the SILK-WORM. 353 
r. They defcribe a femicircle in eating. 
2. Their excrement has perfectly the form of a mul~ 
berry. 
3. They have no fex before their metamorphofis. 
Cuap. I. Of the Cocons. 
I. IT is almoft a general rule to wait fix or feven days 
after all the cocons feem to be formed, before you take 
them off the boughs in order to give the worms time to 
bring them to perfection. It isthen proper from that time 
to give fome air to the room in which you have kept them, 
in order to diffipate a confiderable dampnefs which the 
worms exhale on their mounting, (when they have not. 
been well fed and kept, for when they have been proper- 
ly nurfed this dampnefs is not to be found) and which is 
of great detriment to the cocons, either by rotting them, 
rendering them foft, or covering them with fpots. 
The cocons may be divided into two general claffes, the 
white and the yellow, in the yellow you meet with all the 
fhades from a bright yellow diminifhing at laft to white,. 
fome few are of a pale green. We reckon nine forts of 
cocons, viz. 
1. The good cocons are thofe which are brought to their 
perfection, ftrong and little, and not at all fpotted. 
2. The pointed cocons are thofe, one of whofe extre- 
mities rifes up in a point. After having afforded a little: 
filk, the point, which is the weaker part, breaks or tears, 
and it is impoflible to continue’ winding that cocon any 
longer, becaufe when the thread comes round to the hole 
it is of confequence broke. 
3. The cocalons are a little bigger than the other, yet 
they do not contain more filk, becaufe the contexture is 
not fo firong. In winding they are to be feparated from 
the reft, becaufe they require to be wound in cooler water,, 
otherwile they furze out in winding. 
4. The: 
