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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 96, page id 1677894601:0116
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=116
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CC
EO itS sinc oF refraction aS FOUF tO three; the sine ol
incidence ot that rar ont ot GlaIS into WVater Will BCFO
its sinc ot refraction a5 20 t0 3r and 4 toz jorntly, that
15, 25 the Factum oF 20 and 4 to the F’actum oF ZL and
33 OF 4580 +093.
And these Theorems beins admitted into Opticks,
there rould be (copeenoush ot handlinq that Science
voluminoullr alter a neur manner; not ontr by teachins
thole chinss irhich tend tothe perfection ot vision, but
alloby determinins mathematicasIr all kinds oF Phaeno-
mena ot Colours wrhich could be produced by retra-
etions. For todo this, there is nothing else requisite
than to find out the separations ot heterOgeNCOUS FaYS,
and their various mixtures and proportions in everi
mixture. By chis way oE arsuins linvented almioit
allthe Phaenomena described in these BO0kS, Beside Tome
othiers lels necellary to the Aroument; and by the
successes I met rith in the tryals, I dare promile, that
tohim wtro Mail argue truly, and then try all chings
rith good Cilasses and sufficient circumspection, the
expectederent illnot bemantino. But he is Arst to
knom wrhat Colours ill arise from any others mixt in
any aftigned ProPOrtiOM.
PROP. IV. THEOR. TTI.
Colours may he produced hy composition rehich salt be lite
to the Colours of homooeneal Fieht as to the appearance
ofColour, but not as to the immutabilitus of Cotour and
constitution of Tieht. And those Colours hy horo mucto
they are more compounded by so much are they less fult
aud inteuse, and by too much composition they may be
dilutet