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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 77, page id 1677894601:0253
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the Colours oF natural Bodies than the several sizes anc
densities oF their transparent particles. But Wwhence it
15 that thele plates, fibres and particles do, accordins
to their sereral thicknesses and densities, ressect severul
lorts oFraYS, Jhare not yet explained. Lo sire lome
intioht into this matter, and make may for understan-
dins the next Part oF this Bo0k, I Mall conclude this
Part with a ter more Propositions. Those irhich pre-
ceded respeet the nature of Bodies, thele the nature ot
Lishe: For both must be understood betore the reason
ot their actions upon one another can be KnOWM. And
Decaule the last Propolition depended upon the velo-
citu oF Light, L will besin rith a Proposition of that
Kind.
PR OP. ZI.
Lieht is propacated from luminous Bodies in time, and
spends about seven or eioht minutes of an hour in passine
From the Sun to the P artb.
Thiswas oblerred tirst by Romer, and then by others,
by means of the Eclipses ot the Satellites ot Fupiter.
tior these Fclipses, Wrhen the Farth is betreen theSun
and fupiter, happen about seven or eisht minutes fooner
chanther ousht to do bythe Pables, and Wrhen thekarth.
is berond the Sun ther happen about seren or eightmI-
nutes later than they ousheto do; the realonbeins, TMaL
the Light of thesatellites has Farther to g0 in the latter
case than in the Former by the Diameter of the LarthS
Orbit. Some inequalities ot time mar arile trom the
excentricities oF the Orbs ofthe Satellites; but thole
CanNOE anliver in alI che Satellites, and aC all FIMeS
10