doubt whether any one of all these Hypotheses have a right to be admitted
Exclusively to all others, for I think it Probable, that Whiteness and
Blackness may be explicated by Reflection alone without Refraction, as
you'l find endeavour'd in the Discourse you'l meet with e're long Of the
Origine of Whiteness and Blackness, and on the other side, since I have not
found that by any Mixture of White and True Black, (for there is a Blewish
Black which many mistake for a Genuine) there can be a Blew, a Yellow, or a
Red, to name no other Colours, produced, and since we do find that these
Colours may be produc'd in the Glass-prism and other Transparent bodies, by
the help of Refractions, it seems that Refraction is to be taken in into
the Explication of some Colours, to whose Generation they seem to concurr,
either by making a further or other Commixture of Shades with the Refracted
Light, or by some other way not now to be discours'd. And as it seems not
improbable, that in case the Pores of the Air, and other Diaphanous bodies
be every where almost fill'd with such _Globuli_ as the _Cartesians_
suppose, the Various kind of Motion of these _Globuli_, may in many cases
have no small stroak in Varying our Perception of Colour, so without the
Supposition of these _Globuli_, which 'tis not so easie to evince, I think
we may probably enough conceive in general, that the Eye may be Variously
affected, not only by the Entire Beams of Light that fall upon it as they
are such, but by the Order, and by the Degree of Swiftness, and in a word
by the Manner according to which the Particles that compose each Particular
Beam arrive at the Sensory, so that whatever be the Figure of the Little
Corpuscles, of which the Beams of Light consist, not only the Celerity or
Slowness of their Revolution or Rotation in reference to their Progressive
Motion, but their more Absolute Celerity, their Direct or Undulating
Motion, and other Accidents, which may attend their Appulse to the Eye, may
fit them to make Differing Impressions on it.

4. Secondly, For these and the like Considerations, _Pyrophilus_, I must