f 1775 ) 
otfier focceGy tho I held the Tube and the abovernen^^ 
tion'd NJatter in it, firft in the flame of a Candle, that 
it might be kifmely heated, and by this means it was 
fo difloiv'd, that it feemd nothing but a Powdf i, and 
in this Operation there \7as alG^ fome rooiflDie exhahrd 
From this Wonderful Br^^dmg, and that m f-^ch ftnaU 
pieces, I could conclude nothing elfe, but th »; a^« eat 
many Watery Particles were fhut i:p in this fariie Matter, 
and that thefe Particles were fo ftrongly united, and 
were moreover of fo tenacious a fubftauce, that it did 
aot admit of the leaft Evaporation . of Moifl^ure 5 and 
thefe Watery Particles being rarify'd by Heat,' demand- 
ed more fpace, and io occaiion'd the Eorfting of the a*: 
bovefaid Mattcn ..... 
I fee theiaid Tube with the Powder in it over fo vio- 
lent a Heat that it was ready to melt, and immediately 
thereupon pour'd the Powder itito Water^ but it did 
not turn, to a Chalky fubftaoce^ and afterwards decanting 
the Water into a Clean Glafs^Tube, 1 obferv'd it to be 
impregnated with'Sak particles, . 
In doing this I faw a great .number of exceeding thia 
Particles liSe Fig. 9. I K, upon the fides of the Glafs, and 
thofc'^that were the thinoeft appeared now j lift as the 
fo}all Holes on the outfide of a Thimble do to the naked 
Eye. 
1 placed feyeral of the fmali Splinters tha^t burft in the 
Fire before a Micro^xope, and ordered my Painter to 
draw that of which he had the cleareft view, as you may 
fee, by Figv 10. NO. ^ ' 
Thi^ Splinter wa^ fo narrow, that it had but three 
Rows of little Holes, which were all three no broader 
than the Hair of one s Head ^ and in fom.e other Splinters 
the Holes were yet fmaller. 
From thefe Difcoveries, I confiderVbwith my (elf, wlie- 
ther there had not been fome Matter fhnt up in each of 
tiiefe Holes, which being rarify'd by the Heat, demanded 
Tttttttttc , ' ' 6 
