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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 74, page id 1677894601:0250
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(74
rith parallel Curtaces, the Cumm oF all the retractions
Wris be cqual to the linole refraction wrhich it would
have suttered in pastins immediatelr out ot the ArA
medium intothe last. Andthis holdstrue, thouch the
number ot the retractino substances be increaled to infi-
nity, and the distances trom one another as much de-
creased, (o that the Lighe may be retracted in crery
point of its passage, and by continual retractions bent
intoa curre Linc. And theretore the whole refraction
ofLight. in passins through the Atmosphere From the
hichest and rarest part thereot donnto the lovest and
densest part, must be equat tothe retraction wrhich it
vould lutter in passins at likre obliquier out oF a Va-
cuum immediatels into Air of equal density with that
in the lorrest part ot the Atmosphere.
No, by this Table, the refractions oF a Pscudo-T0-
Dazu a Selenitis, Rock CryCal, IMand CrrStal, Vulgar
CtaIS (that is, Sand melted together) and Cila(s of
Antimonr, irhich are terrestrial Hony alcalizate con-
cretes, and Air irhich probably arilestrom uch substances
Dy Fermentation, thoush these De substances very differins
From one another in densier, ret ther have their vetra-
etire porvers almost in the lame proportion to one ano-
theras their densitiesare, exceptins thatthe retractionot
that strange substance Illand- Crystal iS a litele bigger
thanthe rest. And particularir RII, irhich is 3400times
rarer thanthe Pleudo- Popaz, and 4200 times rater than
Ctass of Antimonr, has notrithstanding its raritr the
Came retractire porrer in respect ot its densier irhich
thole urorery dense substances hare in respect oF theirs,
exceptins (0 tar a5 thole trro ditter From one another.
228iIH9