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River, B. the Fall of it, C. the Tub into which it falls , LG. 
a Pipe, the orifice of the Pipe , or Nofc of the Bellows, 
GK. the Hearth, E, a hole in the Pipe, F. a ftopper to that 
holcj D. a place under ground, by which the water runns 
a^yay. ^ Stopping the hole E , there is a perpetual ftrong 
wind, ifluing forth at G ; and G. being ftopt, the wind comes 
out fo vehemently at £3 that it will, I believe, make a Ball 
play, like that at Frefcati. 
An E-^ra^ of a Letter , containing fome Obfervatiom^ 
made in the ordering of Silk-worms, communicated 
by that kpom Vertuofo, Mr. Dudley Vzlmcr from 
the ingenuous iWr.Edward Digges. 
I herewith offer to your Society a finall garcel of my 
Virginian filk. What I jfiave obferved in the ordering of 
Silk-worms,contrary to the received opinion, is ; 
1. That I have kept leaves 24. hours after they are ga- 
thered , and flung water upon them to keep them from 
withering 5 yet when (without wiping the leaves) I fed 
the worms, I obferved, they did as well as thofe frelh ga- 
thered. 
2. I never obferved, that the fmell of Ti?i'^rrr, or finels 
that are rank, did any waies annoy the worm, 
3. Our Country of Virginia h very much fubjeft to 
Thunders : and it hath thundered exceedingly when I 
have had worms of all forts, fome newly hatched 5 fome 
half way in their feeding 5 others fpinning their Silk 5 yet 
I found none of them concerned in the Thunder , but kept 
to their bufinefs, as if there had been no foch thing. 
4. 1 have made many bottoms of the Brooms ( wherein 
hundreds of worms fpun) of Holly - and the prickles were 
fo far from hurting thcm^that even from thofe prickles they 
firft began to make their bottoms. 
I did hcpe with this to have given you afliirance, that 
hy retarding the hatching of feed,two crops of Silk or more 
might 
