the Sun as 'tis represented at F, and if that Angle become
less (suppose by depressing the Globe to E) there will appear other
Colours, yellow, green and blue successive in the same side of the
Globe. But if the Angle be made about 50 Degrees (suppose by lifting up
the Globe to G) there will appear a red Colour in that side of the Globe
towards the Sun, and if the Angle be made greater (suppose by lifting
up the Globe to H) the red will turn successively to the other Colours,
yellow, green and blue. The same thing I have tried, by letting a Globe
rest, and raising or depressing the Eye, or otherwise moving it to make
the Angle of a just magnitude.

I have heard it represented, that if the Light of a Candle be refracted
by a Prism to the Eye; when the blue Colour falls upon the Eye, the
Spectator shall see red in the Prism, and when the red falls upon the
Eye he shall see blue; and if this were certain, the Colours of the
Globe and Rain-bow ought to appear in a contrary order to what we find.
But the Colours of the Candle being very faint, the mistake seems to
arise from the difficulty of discerning what Colours fall on the Eye.
For, on the contrary, I have sometimes had occasion to observe in the
Sun's Light refracted by a Prism, that the Spectator always sees that
Colour in the Prism which falls upon his Eye. And the same I have found
true also in Candle-light. For when the Prism is moved slowly from the
Line which is drawn directly from the Candle to the Eye, the red appears
first in the Prism and then the blue, and therefore each of them is seen
when it falls upon the Eye. For the red passes over the Eye first, and
then the blue.

The Light which comes through drops of Rain by two Refractions without
any Reflexion, ought to appear strongest at the distance of about 26
Degrees from the Sun, and to decay gradually both ways as the distance
from him increases and decreases. And the same is to be understood of
Light transmitted through spherical Hail-stones. And if the Hail be a
little flatted, as it often is, the Light transmitted may grow so strong
at a little less distance than that of 26 Degrees, as to form a Halo
about the Sun or Moon; which Halo, as often as the Hail-stones are duly
figured may be colour'd, and then it must be red within by the least
refrangible Rays, and blue without by the most refrangible ones,
especially if the Hail-stones have opake Globules of Snow in their
center to intercept the Light wit