Opticks 1717 - Up

nterceptedj the Paper lofi its white Colonr, and
appear&i of the Colour of the refi of theLight
whic~t was not intercepted. So then the Paper
was illuminated with Lights of varidns CO-
Iours , naincly , red, yel10~, green9 b$e and
violet, and every part of the Light rctamed its
proper Colour, until it was incident on the Paper,
and became refle&cl thence to the Eye ;
j’o that if it had been either alone (the’ reit of
the Light being intercepted) or rf It had a-
bounded moiE and been predominant in the
Light refleAed from the Paper, it would have
tinged the Paper with its own coioixr ; and yet
he&g mixed with the reff of the Chh.m in a
due proportion, it made the Paper look white,
and therefore b a Compofition with the reft
produced that F olour. The fevcrd .parts of
the coloured Light refle&ed fi-om the Spe&rum,
wbilff they are propagated from, thence through
the Air, do perpetually retain their proper Cofours,
becaufe wherever they fall upon the Eyes
of any ?I@ e&ator, they make the feveral parts of
the SpeC f rum to appear under their proper Colow-s,
They retain therefore their Proper Colours
when they fall upon the Paper V, and fo
by the confufioti and perfeA mixture of thofe
~o~.u-s compound the whitenefs af the Light
rcflehed from thence,
Eq@r. ~0. Let that SpeRrum OI- folar Imag$
P T fin I;i9. 6.1 frill flow rip011 thf2 ,.I_lehs P&N
abow four Inches brotid, aud about fix Feet &-
cant. from the Prifm AB C, and fo figured that:
It nlay caufe the coloured Light which diver&
Gth b-m the Prifm to cbnverge aild tixx!t again
I at