hin the Halo (as _Hugenius_ has
observ'd) and make the inside thereof more distinctly defined than it
would otherwise be. For such Hail-stones, though spherical, by
terminating the Light by the Snow, may make a Halo red within and
colourless without, and darker in the red than without, as Halos used to
be. For of those Rays which pass close by the Snow the Rubriform will be
least refracted, and so come to the Eye in the directest Lines.

The Light which passes through a drop of Rain after two Refractions, and
three or more Reflexions, is scarce strong enough to cause a sensible
Bow; but in those Cylinders of Ice by which _Hugenius_ explains the
_Parhelia_, it may perhaps be sensible.

_PROP._ X. PROB. V.

_By the discovered Properties of Light to explain the permanent Colours
of Natural Bodies._

These Colours arise from hence, that some natural Bodies reflect some
sorts of Rays, others other sorts more copiously than the rest. Minium
reflects the least refrangible or red-making Rays most copiously, and
thence appears red. Violets reflect the most refrangible most copiously,
and thence have their Colour, and so of other Bodies. Every Body
reflects the Rays of its own Colour more copiously than the rest, and
from their excess and predominance in the reflected Light has its
Colour.

_Exper._ 17. For if in the homogeneal Lights obtained by the solution of
the Problem proposed in the fourth Proposition of the first Part of this
Book, you place Bodies of several Colours, you will find, as I have
done, that every Body looks most splendid and luminous in the Light of
its own Colour. Cinnaber in the homogeneal red Light is most
resplendent, in the green Light it is manifestly less resplendent, and
in the blue Light still less. Indigo in the violet blue Light is most
resplendent, and its splendor is gradually diminish'd, as it is removed
thence by degrees through the green and yellow Light to the red. By a
Leek the green Light, and next that the blue and yellow which compound
green, are more strongly reflected than the other Colours red and
violet, and so of the rest. But to make these Experiments the more
manifest, such Bodies ought to be chosen as have the fullest and most
vivid Colours, and two of those Bodies are to be compared together.
Thus, for instance, if Cinnaber and _ultra_-marine blue, or some other
full blue be held together in the red homogeneal Light, they will both
appear red, but the Cinnaber will appear