r 5101 ) 
But further to enforce this Expcrmm ; if, inikaa bf the Paper^ 
any White J^rofA^ confifting of fmall bubles, be iJluminated by re- 
flexion from the aforefaid Colours, itfliallto the naked eye feem 
White, and yet through a good Microfcope the feveral Colours will 
appear diftinft on the bubles, as iffecn by reflexion frbm fo many 
fpherical furfaces* With my naked eye, being very near, 1 have 
fodifcernM the feveral colours on each bubic ^ and^yetat a grea-ter 
diftance, where I could not diflinguifli them apart, the Froth hath 
appeared entirely White, And at the fame diftance, when I iook'd 
intently, I have feen the colours di/linftly on each buble ^ and yet, 
by ftraining my eyes as if I would look at fomething far off beyond 
them, thereby to render the Vifion confus'd, the Froth has appeared 
without anyothcr colour than Whitenefs. And what inhere faid 
of Froths,may eafilyie underftood of the Paper or Metal in the fore- 
going Experiments. For, their part^ are fpecular bodies, like thcfe 
Bubles ; And perhaps with an excellent Microfeope the Colours m^y 
%eaIfo feeninterraixedlyrefleded from them. 
-In proportioning the feverally ColourM bodies to produce thqfe 
effeASjthere day become nicenefss andit will be more convenient, 
to make ufe of the colours of the Prifme, caft on a Wall, by whofe 
reflexion the Paper, Metal, Froth, and other White fubftances may 
te illuminated. Andl ufually made my Tryals this ryay, becaufe 
J-could better exclude any fcattering Light from mixing with the 
colours to dilate them. 
F To this way of Compounding Whitenefs may be referred i:kjto- 
ther, by Mixing light after it hath been trajedcd through tranfpa- 
rently coloured fubftances. For inftance, if no Light be admitted in- 
to a room but only through ColourM glafs, whofe feveral parts 
are of feveral colours in a pretty e^ual proportion- aU White things 
in the room fliall appear White, if they be not held too near the 
Glafs. And yet this light, with which they are illuminated, can- 
not poffibly be uniform, becaufe, if the Rays, which at their entrance 
are of divers colours, do in their progrefs through the room fuffee 
any alteration to be reduced to an Uniformity 4 the Glafs would not 
intheremoteft parts of the room appear of the very fame colour, 
which it doth when the Spectators eye is very near it : Nor would 
tke rays, when tranfmitted into another dark roomthro-ugh a little 
hole in an oppofite door or partition-wall, projeftona Pape^ the 
Species or reprefentation of the glafs in its proper colours. 
And, by the by, this feems a very fit and cogent Inftattce of fome 
other parts of my Theory, and particularly of the 13 Fropofitm. For, 
in this room all natural Bodies whatever appear in their proper co- 
lours. And all iht FhmQmena of colours in nature, made either by 
Refradion or without it, are here the fame as in the Open Air, 
-Now, the Light in this room being fuch a Difiimilar mixtire^ as 
M ra iara ma » ^ 
