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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 120, page id 1677894601:0140
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TT20
rion; then aIl theColours in the Norld must De such as
constantly oughe to arile From the original coloritic qua
lities oF the rars whereot the Lishes consist br erhich
those Colours are seen. And theretore if the realon ot
any Colour Wrhat. erer De required, re hare nothins elle
to do then to consider hour the rars in the Suns Light
hare by rellexions or retractions, or other causesbeen par.
ted trom one another, or mixed togethei; or othermileto
find out irtrat Ports ot rars arc in the Light by irhich
that Cotour is made, and in rhat proportion; and
then by the lalt Problem to learn the Colour rhich
oughe to arise by mixins chole rars (Or their COIOurS)
in that proportion. I speak here oF C Olours (0 Far 45
they arise trom Liglt. For ther appear lometimes by
Other caules, a5 wrhen by the porrer ot phantasy ve
sec Colours in a Dream, or amad Man Pees Fhinos betore
him wrhich are not there; or erhenre sec Fire By Arikins
The Fye, or sec Colours like the fiye oF a Peacocks
Feather, by pressins our Rires in cither corner wrhilst
ve look the other war. Where thele and such lite
causes interpose not, the Colour alivars ansivers t0
the Cort or Ports of the rays whereot the Lioht con(iAS,
a5 Itrare constantr Found in Wrhat ever Phaenomena ol
Colours Thare hitherto been able to examin. LMaII in
thefollorrinq Propolitions sive instances ot this in the
Phaenomena ot chietes note.