Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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1leaſt glimmering of Light; whence we
inferr'd, that the flaſh appearing in the
Receiver, did not proceed from any new
Light generated there, but from ſome
reflections of the light of the Sun, or
other Luminous Bodies plac'd without
it; though whence that Reflection
ſhould proceed, it poſ'd us to conje­
cture.
Wherefore the next Morning, ho­
ping to inform our ſelves better, we
went about to repeat the Experiment,
but though we could as well as former­
ly exhauſt the Receiver, though the
place wherein we made the tryal was the
very ſame; and though other Circum­
ſtances were reſembling, yet we could
not diſcover the leaſt appearance of
Light all that Day, nor on divers o­
thers on which tryal was again fruitleſ­
ly made; nor can we to this very time
be ſure a Day before hand that theſe
Flaſhes will be to be ſeen in our great
Receiver.
Nay, having once found the
Engine in a good humour (if I may
ſo ſpeak) to ſhew this trick, and ſent
notice of it to our Learned Friend
Doctor Wallis, who expreſſ'd a great

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