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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 79, page id 1677894601:0255
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appear by rellexion. And this alternate reflexion and
transmistion, as Lgather by the 24th Obserration, con-
tinues For abore an hundred vicissitudes, and by the
the Oblerrations in the next part of this Book, Formany
thoulands, beins propasated trom onc Turtace ot a Glals-
plate to the other, Though the thicknels ot the plate
De a quarter ot an Inch or above: 50 that this alter-
nation seems tobe propasated trom every retractins
lurtace to aM distances without end or limitation.
Phis alternate reflexion and retraction depends on
both the Curtaces ot every thin plate, becaule it de
Dends on their dittance. By the 2rth Observation, It
cither Curtace oF a thin plate of Muscory-CilaIS DC vet-
ted, the Colours caused by the alternate retlexion
and refraction grorr faint, and theretore it depends on
them Both.
Itis theretore performed at the second Turtace, FOr
iF it avere performed at the ArHt, betore the rays ar
rire ac the second, it vould noc depend on the le-
cond.
IE is allo insluenced by some action or dispoltion,
propasated trom the tirst to the second, becaule other-
rise at the second it mould not depend on the tirst. And
this action or dispolition, in its propasation, intermits
and returns by equal interrals, because in aIl its pro-
sress it inclines the ray at one distance From the ArI
lurtace to De reslected by the second, at anottier to De
transmitted by it, and that by equal interrals for innu-
merable ricissitudes. And because the ray is dispoled
to reflexion at the distances 1, 3, 5, 7, 9, bc. and t0
transinission at the distanceS O, 2, 4, 6, 8, 10, dc, (For
us transmission chroush che trst surtace, is at the di
RANCC