(a6) 
River 3 B. the Fall of it, C. the Tub into which it falls s LG, 
a Pipe, G. the orifice of the Pipe , orNofe of the Bellows, 
■GK' the Hearth, E. a hole in the Pipe, F. a ftopper to that 
hole, D. a place under ground, by which the water runns 
away. ^ Stopping the hole E, there is a perpetual ftrong 
wind, ifluing forth at G : and G. being fiopt, the wind comes 
out lb vehemently at £, that it will, I believe, make a Ball 
play, like that at Frejcati. 
An Extrafi of a Letter , containing fome Obfervations , 
made in the ordering of Silk-worms, communicated 
by that known Vertuofo, Mr. Dudley ¥ dimer from 
the ingenuous d/r.Edward Digges. 
I herewith offer to your Society a fmall parcel of my 
Virginian filk. What I have 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^ yet when (without wiping the leaves) I fed 
the worms, I obferved, they did as well as thofe frefh ga- 
thered. 
2. I never obferved, that the fmell of Tobacco ^ or feels 
that are rank, did any waies annoy the worm. 
§. Our Country of Virginia is very much fubjed to. 
Thunders : and it hath thundered exceedingly when I 
have had worms of all forts, fbme newly hatched } feme 
half way in their feeding 5 others fpinning their Silk 5 yet 
I found none of them concern’d in the Thunder , but kept 
to their bufinefs, as if there had been no fitch thing. 
4, 1 have made many bottoms of the Brooms ( wherein 
hundreds of worms fpun) of Holly ^ and the prickles were 
fb far from hurting them,that even from thofe prickles they 
firft began to make their bottoms. 
I did hope with this to have given you affurance, that 
by retarding the hatching of feed,two crops of Silk or more 
• - might 
