( S46 ) 
then having caufed the Pump to be plied, I found, that the Water 
did pafs ^ e^^/y through the faid Plafter. I therefore cover d it 
with Venice-Turpentine inftead of water, and then I faw, that it 
evacuated very well, and that nothing paflfed through it for the 
fpacc of two hours. Then I took fbme Oy 1 very hot , and pou- 
red it over the Turpentine, which did melt by this heat and paflTed 
through the Plafter. Then I took off this Tube which was fo 
pervaded by the Turpentine, and I faw,that that had made it tranf- 
parent. Which effeft is pretty like , and is to be explicated in 
the fame manner as, fihat of the little Stone called Oculfts mundi. 
Thus we may be affifted by the Weight of the Air to make divers 
forts of Glues penetrate Plafter, baked Earth, Wood, &c. And 
polEbly thofe^whofiiallmakea good number of fuch trials, will 
find their labour and pains recompenced, by giving to thofe ma- 
terials fuch properties, as they never had before. 
I didalfo put fomejEg^i in t\\tvacuum^ and one day I faw one 
of them break, which I had put in a fmall Receiver. It burft 
upon the very firft fuflion : But fince that time I could never make 
arjy break , though I exhaufted as much as I could thofe Re- 
ceivers wherein I had put fome. You muft therefore begin to 
crack them a little before you put them in the vacuum j and then 
ihey do eafily break quite, and what is in the Egg rifeth all into 
a very chick froth/ I alfo put fome of thefe, thus ordcr'd , ov^ 
thefire,wherethey boiled very eafily, not being preffed by the 
Air, but they boiled there very long, before it began to appear 
that they were fo boiled as to be ready to eat. 
AH the little bubbles that appear in Muftard, do fwell and 
break in vacuo , and after that , the Mufiard is feen to be without 
bubbles. 
One day I included a hlacb Ribbon in the vacuum^ and then 
burnt it with a Burning-glafs. Abundance of fmoke iffued out of 
it, which fell by little and little, and fo permitted Us to fee the 
Ribbon plainly ; which appeared not at all changed* But after 
I had returned ihe Air unto it,and touched it, 1 found it all turn'd 
to afiies. r 
Another time I caufed alfo fome Gunporoder to be burnt after 
the fame manner 5 and I was much furprized to fee , that it burnt 
grain by grain , none of the grains kindled firing thofe which 
touched. Another time when the Sun had lefs force, I could not 
at 
