( 5 ) 
dered it i while before I* went to deep, and found it to ftrine vi- 
vidly. 
The next morning when I awaked, though the Sun was rifen, 
yet forbearing to draw open the Curtains of my bed, till I 
had looked upon the Fealed Giatey which I had fenced with a 
piece of Cloth, held between it and the window, my Eyes ha- 
ving not yet been expofed to the day-light fince the dirknefs 
they had been accuftomed to, during the night, made roe think 
the Wood ftiined 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 fomuchfo asin the morning. 
The morning after, and the night after that, the fame Wood 
did likewife manifeftly, though not vigoroufly fhine, cfpecUlly 
one piece, wfaofe light was much more vivid than the reft. And, 
for ought I know, I might have obferved them to ftiine longer,, 
if one of the Fealed ends of the Glafs had not been accidentally 
broken. 
Experiment VII. V* 
W Hilft theformerTrials were making, I was wifhing for 
a good Bolonim Stone, to try what effed the withdraw- 
ing of the Air would have upon ir. For though I knew it might 
be obje&ed, that the Experiments of Light performablc in out 
Engine muft be made in the night, whereas the Bolenim Stone 
gains its light by being expofed to the fun-beams, yet that obje- 
ction did not hinder my wifti, fince fhe better fort of Boknim 
Stones may be indued with a lumincufnefs by the ftame of fire,or 
of large Candles. 
I alio wiftied for fuch a paining Dimend, is is now in the hands 
that beft deferve fuch a Rarity, our Royal Founders, For you may 
remember, that in the Obfervations I made of that Stone, and 
annexed to the Condufion of the Book of Colours, I Ihow how it 
may feveral ways be brought to ftiine $ fo that by one or other of 
th®fe ways, efpecially that of external Heat, I thought it very 
likely, I flioald be able to make the light continue four or five mi- 
nutes, which would be long enough to try in a very fmali .Re c el- 
ver, exhauftible at a Suck or two, whether the withdrawing and 
reftoringthe Jk would have any vifibic Op oration on it t 
~ ‘“T' 1 alf© 
