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defboy . one anoth!rs<br />
therefore from any Modifications of Light made<br />
by RefraAions and Shadows, but have fame o-<br />
ther came, Vi/hat that Caufe is we fhewed a-<br />
bove in this tenth kY,xperiment, and need not<br />
here repeat it.<br />
There is yet another material cikumfiance<br />
of this Experiment. For this emerging Light<br />
being by a third Prifm HIM: [in Fig. 22. fPn~+t r .]<br />
refraAed towards the Paper P’T, and there paint-,<br />
ing the ufiiaf Colours of the Prifm, red, yellow,<br />
green, blue, violet: If thefe Colours arofe from<br />
the Refra&ions of that Prifm modifying the<br />
Light, they would not be in the Light ‘before<br />
its Incidence. on that Prifm. And yet in that<br />
Experiment we found that when by turning<br />
the two firit Prifnls about their common Axis<br />
all the Colours were made to vanifll but ; the<br />
red ; the Light which makes that red. being<br />
left alone, appeared of the vesy fame red Colour<br />
before its Incidence on the third Prifm,<br />
And in general we find by other Experiments~<br />
that when the Rays which differ in Refrangibii<br />
lity are fepqtted from -one another, and any<br />
one fort of them is confidered apart, the Co+<br />
lour of the Light which they”compofe cannot<br />
be changed by any RefraAioil or Reflexion’<br />
,%hatever , as it sught to be:,were Colours no:<br />
thing elfe than .Modifications of Light caqfed<br />
by -RefraAions, and Reflexions; and Shadows.<br />
This unchangeablei~efs of Colour I am now to<br />
Befcribe in the following Propofition. e ): _: ‘_,<br />
, L’<br />
,, , 9.’ ‘?<br />
: ‘<br />
I<br />
” ,. . “,_<br />
I ~ ~-ti.t+s<br />
‘b:
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