(5^7) 
dered it a while before I went to lleep~ and found it to fliine vi- 
vidly. 
The next morning when I awaked, though the Sun was rifeHj 
yet forbearing to draw open the Curtains of my bed , till I 
had looked upon the fealed Glafs, which I had fenced with a 
piece of Cloth, held between it and ths window, my Eyes ha- 
ving not yet been expofed to the day-light fince the dirknefs 
they had been accuftomed to, diiring the night, made me think 
the Wood fliined brighter than ever. And this night after ten of 
the Clock, looking on it in a dark place^ it appeared luminous 
all its length, though not fo much fo as in the morning. 
The morning after, aod the night after that, the fams Wood 
did iikewife manifeftly, though not vigoroufly fnine, cfpecially 
one piece, whofelighc was much more vivid than the reft. And, 
for ought I know, I might ha.ve obfcrved them to (bine longer, 
if one of the fealed ends of the Glafs had not been acci(fentaily 
broken. 
Experiment VII. 
WHilft the former Triak were making, I w^as wifliingfor 
a good Bolonian Stone, to try what tScCi the withdraw- 
ing of the Air would have upon it. For though I knew it might 
be objeded, that the Experiments of Light performabk in out 
Engine muft be made in the night, whereas the B^knian Stone 
gains its light by being expofed to the fun-beams, yet that obje- 
diondid not hinder my wiftj, fince the better fort of Bchnkn 
Stones may be indued with a lumincufnefs by the flame of fire,or 
of large Candles. 
I alfo wiftied for fuch a fhining Dimoniy is is now in the hands 
that beft defervc fach a Rarity, our Ro^d Feunders. for you may 
remember, that in the Obfervatioos I made of that S tone, and 
annexed to the Conclufion of the Bdok of Cdkurs^ \ (how how ic 
may feveral ways be brought to ftiine 5 fo that by oee or other of 
th#fe ways, efpecially that of external Heat, I thought it very 
likelyjl rfiouldbeable to make thelight continue four or five mi- 
nutes, which would be long enough to try in a very fmall Recei-- 
ver^ exhauftibleataSuckortwo, whether the withdrawing and 
reftoringthe -^ir would have any vifibk Operation on ic 
