( ; 
IV, Of the NMture ofSI L Kj tt is made m 
Piedmont. Communicated by William Agli- 
^ - onby, Efqj FXS. 
Sllk^which is the Spittle of a Worm,hath its good or bad 
Quality from the Nouriffioieot the Worm receives 
either from a good or bad Leaf | Therefore the chief 
Depeodance is on a happy Spring , proving both fweeE 
and pkafinr ; exempt from too much .Rain, which com- 
monly rot the Leaver ; from Southerly Winds, which 
burft the Worms- and from ftroog Northerly Winds, 
whofe piercing cold fpoils the Leaf, giving ic an ill Qua- 
lity. All thefe uofeafeoable Weathers are very pernici- 
ous to thefe little Animals^ which every one obferve 
with great Attention , and follow more or lefs the Indi- 
cSiions from whence they draw the Confequeoces by 
the Produtft, in Quantity and Quality. 
When the Spring proves delightful and fweet, the 
Worm feeding oo a good and tender leaf, free from the 
Prejudices of an uokiod Seafon, (which fometimes fpoil 
the Leaf, by giving it a rough, grofs, and heavy Na- 
ture) then one may exped a profitable Harveft and 
in fuch Years 'tis beft to make a good Provifion, for 
Silk wiii then find goad Sale when moft Abundance,and 
the Buyer meets wiih that of a good Subftance, which 
^the advantagtous Seafon very much contributes to ^ but 
not knowing how long it may laft, about Midiummer 
(6t Sr. Johns Tide) they begin to draw the Silk from 
iisCccon, to fee what it yields, and judge of its increafe 
or fcarcity , as well as the eftimate of its goodnefs and 
perfedioos, thofe moft defirable are, vh. That it prDves 
clean, I ghr, and ftrong. 
Great 
