C SiOl ) 
But furthet' to enforce this Experiment ; if, inflead of the PaperJ 
any White fm/?^ confifting of fmall bubles, be illuminated By re=- 
flexion from the aforefaid Colours, itfliallto the naked eye feem 
White, and yet through a good Microfcope the feveral Colours will 
appear diftind on the bubles, as iffeen by reflexion from fo many 
fpherical ^furfaces» With my naked eye, being very near, I have ai- 
fodifcernM the feveral colours on eachbublc ^ and yet at a greater 
diftance, where I could not diftinguiOi them apart, the Froth hath 
appearM entirely White, And at the famediftance, when I Iook*d 
interitly, I havefecn the colours diftindly on eachbublej and yet, 
by {training 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 any other colour than Whitenefs. And what is here faid 
of Froths,may eaflly be underfl:ood of the Paper or Metalin the fore- 
going Experiments. For, thdr parts are fpecular bodies, like thcfe 
Bubles And perhaps with an excellent Microfcope the Colours may 
be alfo feen interraixedly refleded from them. 
In proportioning the feveral ly Coloured bodies to produce thefe 
efFeds^there may befome nicenefs ^ audit will be more convenient, 
tomakeufe of the colours of the Prifmc, caft on a Wall, by whofe 
reflexion the Paper, Metal, Froth, and oliher White fubftances may 
be illuminated. Andl ufually made my Tryals this ^ay, becaufc 
Icould better exclude any fcattering Light from mixing with the 
colours to dilate them. 
^> To this way of Compounding Whitenefs may be referred thato- 
ther , by Mixing light after it hath been tra jeded through tranfpa- 
rently colour'd fub (lances . For inftance, if no Light be admitted in- 
to a room but only through Coloured glafs, whofe feveral parts 
are of feveral colours in a pretty equal proportion-, all White things 
in the room fliall appear White, if they be not held too near tli« 
Glafs. And yet this light, with which they are illuminated, can- 
not pofllibly be uniform, becaufe, if the Ray which at their entrance 
are of divers colours, do in their progrefs through the room fuifer 
any alteration to be reduced to an Uniformity ; the Glafs would not 
in the rcmotefl 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 room through a little 
bole in an oppofite door or partition- wall, projed on a Paper the 
Species or reprefentation of the glafs in its proper colours. 
And, by the by, this feems a very £t and cogent Inftancc of foms 
other parts of my Theory, and particularly of the ii Propofuion. For, 
in this room all natural Bodies whatever appear in their proper co- 
lours. And all the of colours in nature, made either by 
ilefradion or without it, are here the fame as in tht Open Air. 
Now, the Light ig this room being fuch a Difliiriilar mixta.e, as 
Mraramraz ~ I 
