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flributioh of dlverfly coloured rays - fuch as ought to bt 'c?aus*(ii by 
Keflexion from a Mii^ture of whice and black, or of diverfly co. 
lour'd corpuMes^^ But when fuch ifnpferfeaiy toixt Light is by a /?- 
Reflexion from the p^per more evenly and uniformly "blended, 
it becomes more pleafant, and exhibits ^fam or ftadow'd White- 
nefs. And that fuch little irregularities as thefc may caufe thefe dif- 
ferences, is not improbable, if we confider, how much variety rtiay 
be caufed in «yfl/^;?^// of the fame tone by irregular and Hncren jar- 
rings. And befidesj thefe differences arc fo little, that I tave forae- 
times doubred, whether they be any at all, when I have confider'd 
that a Black and White Body being placM together, the one in a 
-ftrong light, and the other in a very faint light, fo proporti- 
oned that they might appear equally luminous h it has been dif- 
ficult to diftinguiili them, when viewM at diftance,unlefs When the 
Black fe^im'd more blewifli i and tbe White body in a light ftiU 
fainter, hath, in comparifon of the Black body, it fetf appeared 
Black. 
This leads me to another way of Compomdi/tg tvhUe)fefs whicih 
is. That, if four or five Bodies of tlie more emi:he'rtt colours, or a 
Paper painted all over, in feveral parts of it, with thofe fcveral 
colours in a due proportion, be placed inthe faid Beam of Light j 
the Light, reflcded from thofe Colours to another White paper, 
held at a convenient diftance, fhall raake that paper appear White. 
Ifitbeheldtoo n^ar the Colours, its parts will Teem of thofe colours 
that are neareft them • but by rcmoYihg it further, that aU its parts 
may be equally illuminated by all the colours, ttrey will be more and 
more diluted, until they become perfedly White. And you may 
farther obferve, thatif 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 fVhkeHefs is 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 
it fell confufcdly on the paper, it mull: much more be Uniform, whtn 
at a greater diftance it fallson the Spedators eye, and To the rays, 
which come from feveral colours, would in no qualities differ from 
one another, but all of them exhibit the fame colour to threSpcfta^ 
tdr> contrary to what he fees. 
Not much unlike this Ihftancek is,That,if a poliflit 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 apparent colours may be blended together, they fliall 
difappear, and- by tbck mix^-S?;? M^A^l^. look 
White, 
^ ^ Xut 
