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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 52, page id 1677894601:0228
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. 61
(52
reason Why unitorm pellueid mediums, (Tuch a5 Nater,
Gta(S, OE C xYAtaL) have no sensible cellexion but in
their external superficies, where ther are adjacent to
otter mediums of a ditterent density, is because ali
their contisuous parts have one and the lame degree
oF dentier.
P R O P. TI.
The least parts of almost al naturat Bodies are in some
measure transparent: And the opacity of those Bodies
ariseth from the multitude of reflexions caused in their in-
ternat Parts.
Thae this is C0 has been obterved by others, and
Wvilleaulr be sranted by them that have been convei-
Tant ith Miscroscopes. And it may be also tryed by
applyins any substance to a HIole throush irhich lome
Lishit is immitted into a dark room. For ho opake
foerer that substance may leem in the open Air, it viiI
by that means appear very manitestls transparent, it
it be oF a sufficient chinnels. Onlr irhite metalline B0-
dies must be excepted, irhich by realon ot their excel
sre densiey seem to reflect almost ai the Light incis
dent on their Arst Cuperticies, untess by Colution in
menstruums ther De reduced into very (mall particles,
and then they become transparent.
E R OP. IIE
Betreeen the parts of opate and coloured Bodies are
manu spaces, eitber emptus or replenisted roith mediums
of other densities; as Water betreeen the tingins corpuscles
roberevith any Liquor is impresnated, Air betreeen the
aqueous