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

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1a Reaſon of the leſs difficult part of the
Problem: And though Your Lord­
ſhip ſhould ev'n preſs us to declare what
Conjecture it was, that the above-recited
Circumſtances ſuggeſted to us, we ſhould
propoſe the thoughts we then had, no o­
therwiſe then as bare Conjectures.
In caſe then our Phænomenon had con­
ſtantly and uniformly appear'd, we ſhould
have ſuſpected it to have been produc'd
after ſome ſuch manner as follows.
Firſt, we obſerv'd that, though that
which we ſaw in our Receiver ſeem'd to
be ſome kinde of Light, yet it was indeed
but a whiteneſs which did (as hath alrea­
dy been noted) opacate (as ſome ſpeak)
the inſide of the Glaſs.
Next we conſider'd, that our com­
mon Air abounds with Particles or little
Bodies, capable to reflect the Beams of
Light.
Of this we might eaſily give di­
vers proofs, but we ſhall name but two:
The one, that vulgar obſervation of the
Motes that appear in Multitudes ſwim­
ming up and down in the Air, when the
Sun-beams ſhooting into a Room, or any
other ſhady Place diſcover them, though
otherwiſe the eye cannot diſtinguiſh them

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