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have been flint, or in the dark, for two or three 
minutes before. 
By this phofphorus celeftial objefts may be very 
well represented ; as Saturn and his ring, the 
phafes of the Moon,6cc. if the figures of them, made 
of wood, be wetted with the white of an egg, and 
then covered with the phofphorus. And thefe figures 
appear to be as ftrongly illuminated in the night, by 
the flafli from a near difcharge of an electrified bottle, 
as by the light of the day. 
Experiment I. 
Having put fome of the fame parcel of the phof- 
phorus into two glafs balls, and fealed them hermeti- 
cally ; I placed one of them on the outfide of a 
window facing the South, that it might be very 
much expofed to the direCt rays of the Sun, where it 
remained from the 25th of December 1764, to the 
25th of December 1765. The other was kept 
during the fame time in darknefs. After this, they 
were both expofed to the light, and carried into a dark 
room together ; where the phofphorus in each ap- 
peared equally bright. 
Experiment II. 
Some of the phofphorus finely powdered, being 
put into a glafs ball, with as much water as would 
make it adhere to the glafs, fo as to cover the infide of 
the ball, which was hermetically fealed, was found 
gradually to lofe its property of imbibing and emitting 
light, but fafter in fummer than in winter ; fo that 
at 
