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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 54, page id 1677894601:0230
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C54)
not perfectir incorporate. And to the increase ot the.
opacier oE thele Bodies it conduces Lomethins, that by
the 23ch Obserration the resexions ot very thin trant-
Parent substances are considerably sronger than thole
made by the lame substances ot a greater thickness.
P R O P. IV.
Phe parts of Bodies and their Interstices must not be
less than of some definite bioness, to render them opatee and
coloured.
For the opakest Bodies, it their parts be subtily
divided, (a5 Metals by beins dissolred in acid men-
Cruums, 1c.) become pertectly transparent. And vou
may illo remember, thac in the cishth Obserration
there iras no sensible reflexion at the superticies ot
the Object- Cilasses ertere ther vere very near one
anocher, though ther did not absolutelr touch. And
inthe 17th Obterration thereflexion oFtheWater-bubble
irhere it became thinnest as almost insensible, (0 25
eo cause verr blacke Spots to appear on the top ot the
Bubble by the rant ot refected Liglt.
On these gronnds I perceire it is that Water, Saltu
Cla(S, Stones, and such like substances, are transparent.
tor, uxon dirers considerations, ther leem eo be a5 FuII
ot pores or interstices becureen cheir pares as other BO.
dies rre, but yet their parts and interltices to Dc t00
5
1
ndl L Cause reflexions in their common Curtaces.
DROF.