That by the mixture of another body that unites with either of these, which
has a differing refraction from either of the other, quite differing
effects will be produc'd, that is, the _consecutions_ of the confus'd
pulses will be much of another kind, and consequently produce other
_sensations_ and _phantasms_ of colours, and from a _Red_ may turn to a
_Blue_, or from a _Blue_ to a _Red_, &c.
Now, that this may be the better understood, I shall endeavour to explain
my meaning a little more sensible by a _Scheme_: Suppose we therefore in
the seventh _Figure_ of the sixth _Scheme_, that ABCD represents a Vessel
holding a ting'd liquor, let IIIII, &c. be the clear liquor, and let the
tinging body that is mixt with it be EE, &c. FF, &c. GG, &c. HH, &c. whose
particles (whether round, or some other determinate Figure is little to our
purpose) are first of a determinate and equal bulk. Next, they are rang'd
into the form of _Quincunx_, or _Equilaterotriangular_ order, which that
probably they are so, and why they are so, I shall elsewhere endeavour to
shew. Thirdly, they are of such a nature, as does either more easily or
more difficultly transmit the Rays of light then the liquor; if more
easily, a _Blue_ is generated, and if more difficultly, a _Red_ or
_Scarlet_.
And first, let us suppose the tinging particles to be of a substance that
does more _impede_ the Rays of light, we shall find that the pulse or wave
of light mov'd from AD to BC, will proceed on, through the containing
_medium_ by the pulses or waves KK, LL, MM, NN, OO; but because several of
these Rays that go to the constitution of these pulses will be slugged or
stopped by the tinging particles E, F, G, H; therefore there shall be
_secundary_ and weak pulse that shall follow the Ray, namely PP which will
be the weaker: first, because it has suffer'd many refractions in the
impeding body; next, for that the Rays will be a little dispers'd or
confus'd by reason of the refraction in each of the particles, whether
_round_ or _angular_; and this will be more evident, if we a little more
closely examine any one particular tinging _Globule_.
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