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

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