Opticks 1717 - Up

s
z>f the hifin, md confequently be white. I&
the Spaces PT’ and ~-7 on either hand, will not
be illumina!ed @y them all, and therefore will
appear coloured. And particularly at I?, where
the outmofi violet-making kys fill1 alcine, the
CO~OUI- muit: be the deep& vkdet. kit Q where
the violet-malting and in&g&making Kays are
-mixed, ir muit be .a. violet inclining much to
’ indigo. -At R where the violet--1i~a~~ing, indigo-making,
blue-making, and ollc half of the
green-making Rays 8re mixed j their COl.Ours
mrif’t: (by the conftruCtion of the fecond 4?roblem)
compound a middle Colorir between in&
digo and blue. At s WllW~ all the Rays are,
mixed .except the red-making :~nd orange-tna~
king, (heir Colours ought by the Ihmc Rtilc to
~olnpoLInd a faint blue, WYging more to~$reell
than indigo. And in the progr& from S to ‘I?$
‘this blue will grow more and more fbiiit and
dilute, till at T, where al.1 the Colours begin to
be mixed, it ends in whitenefs.
So again, on the other iide of the white at r5
where the leait refrangible or utmofi red-ma;
king Rays ar’e illone, the Colour muft be the
deepeft red. At Q the mixture of *red and CT;
range will compound a red inclining to orange,
At c- the mixture of red, orange, yePlow, aad
tine. half of the green muit compound a middle
Gofour between orange and ycliow. At x the
mixture of all Colours but violet and indigo will
compouild a faint yellow, verging more to green
than to orange. And this yellow will grow
nxm faint and dilute continudly in its progref9
I fi+om