DOI Seite / Zitierlink:
https://doi.org/10.11588/diglit.18826#0182
130 ON PERSPECTIVE. [lECT. IV.
renders whitifli thofe parts of the coloured dreffes
which are neareft to it. On the fame principle, when
the fun mines on a red carpet, the reflection from
the carpet will tinge the ceiling with a reddifh hue,
and the carpet will receive a whitim tint from the
ceiling in return.
It may be worth while, juft to obferve here, that
we confider the reflection as equal to half the direct
ray of light, in force, and the re-reflection as equal
to half of the flrft ray; thus, diminifhing half its
ftrength continually, it foon becomes too feeble to
claim our regard.
It is not very common to confider thefe prin-
ciples as forming part of perfpecfive, yet, as they
feem to me to be very clofely allied to this fcience, I
have ventured to introduce them ; and, perhaps, if
greater attention to the effects and appearances of
Nature, were more commonly introduced into trea-
tifes on the fubjecr, the reafonings, and the illuftra-
tions, to which fuch appearances give occafion,
might relieve, and entertain, as well as direcl, and
inftruft, the Student, to great advantage.
After having in fome particulars fpeculated, as
it were, on extenfive, and remote, effects, I mall
now, requeft attention to what more immediately
belongs to ourfelves; for, after we have invefti-
gated objects of every kind, we neverthelefs, return
with peculiar complacency to the human figure.
We have, on former opportunities, noticed the
proportions, the movements, and the appearances,
of the figure; and the principles we then illuftrated
and
renders whitifli thofe parts of the coloured dreffes
which are neareft to it. On the fame principle, when
the fun mines on a red carpet, the reflection from
the carpet will tinge the ceiling with a reddifh hue,
and the carpet will receive a whitim tint from the
ceiling in return.
It may be worth while, juft to obferve here, that
we confider the reflection as equal to half the direct
ray of light, in force, and the re-reflection as equal
to half of the flrft ray; thus, diminifhing half its
ftrength continually, it foon becomes too feeble to
claim our regard.
It is not very common to confider thefe prin-
ciples as forming part of perfpecfive, yet, as they
feem to me to be very clofely allied to this fcience, I
have ventured to introduce them ; and, perhaps, if
greater attention to the effects and appearances of
Nature, were more commonly introduced into trea-
tifes on the fubjecr, the reafonings, and the illuftra-
tions, to which fuch appearances give occafion,
might relieve, and entertain, as well as direcl, and
inftruft, the Student, to great advantage.
After having in fome particulars fpeculated, as
it were, on extenfive, and remote, effects, I mall
now, requeft attention to what more immediately
belongs to ourfelves; for, after we have invefti-
gated objects of every kind, we neverthelefs, return
with peculiar complacency to the human figure.
We have, on former opportunities, noticed the
proportions, the movements, and the appearances,
of the figure; and the principles we then illuftrated
and