f 5100 ) 
firlbation af diverfly cb^lout'd? ra^^^^^ flicb as ought to l>c caus^J by 
Keflcxion from. a Mixture of wliice and black, or of diverfly co. 
1 0 ur'd corpiafc I es. Bur when fuch imper Fe Si y mixt L igh t by a //. 
i^i?W.Reflexioa fi-om thepapeir rn'Ore even-ly and uniformly ""blended, 
it beconaes^ore pTerfant, and eshlbits a/^/«r or ftadow'd White- 
nefs. And that fuch little irregd arities as theC: may caufe thefe dif- 
ferences, is not improbaWe, if we con (id er, how much' variety may 
l>e caufed in Somis the fame tone by irregular and unevea jar- 
rings. And befides, thefe difFereuccs are fo little, that I h^ave fome- 
times doubted, whether they be any at all, when I haveeonfiderM 
that a Black and White Body being placed together-, the one in a 
flirong light, and the other in- a very faint light, fo proporti-- 
on'dthat they might appeal' equally luminous h it has been dif^ 
ficultto diftinguini them, when view'd at diftance, unlefs when tire- 
4!ack feemM more, bie.wini ^ and the White body in^a light ftill 
fainter, hath, in comparifon of the Black body, it felf appear'd 
Black. 
This leads me to another way o? ComfomMng TVhlienefs * which 
is, That if four or five. Bodies of the more eminent colours, or a 
Paper painted ;all^ over, in feveral parts of it, with thofe feveral 
colour in a' due proportion, be placed in the faid Beam of Light ^ 
thi Light, refjcdedfrom thpfc Colours to another White paper, 
hildat a conyenient diftance, Avail make that paper appear White. 
If it be held too near the Colours, its parts will fceni of thofe colours^ 
thatare neareft them ; but by rcmovingit further, that all its parts 
may be equally illuminated by all the colours, they will be more and 
more diluted, until they become perfcftly White. And you may; 
further obferve, that if any of the colours be intercepted, the Paper 
will no longer appear White, but of the other colours which are not 
intercepted. Now, that this whltenefsh a Mixture of the feverally . 
colourM rays, falling confufedly on the paper, I fee no reafon to 
doubt of ; becaufe, if the Light became Uniform and Similar before 
itfell confufedly on the paper, it rauft much more be Uniform, wheff 
at a c^reater diftance itfallsonthc Spectators eye, and fo the ray.?, 
which come from feveral colours, would in no qualities differ from-^ 
one another, but all of them exhibit the fame colour to the Spefta«i 
tor, contrary to wliat hefees. 
Not much unlike this Inftanceit is,That,if a poIiOit piece of Metal 
befo placed, that the colours appear in it as in a Looking-glafs, 
and then the Metal , be made rough, that by a confused reflex- 
ion thofe appare^nt colours may be blended together, theylnall 
difappcar, and by their mixtare caufe the Metall to iook 
White. 
