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many ranges of Colours, k Z, 592 pz9 ap, ’ r3 83~.<br />
w:hich were parallel to one another an dg con&-<br />
guous, and without any mixture of white. And<br />
thefe ranges of Colours 9 if the Comb was moved<br />
con+~ually up and down with a reciprocal<br />
motib,n, afccended and defcended in the Paper,<br />
and when rhc motion of the Comb was fo quick,<br />
that the CO~OUI-s could not be diitinguified<br />
Coin one another 3 the whple Paper by their<br />
confufion and mixture in the Senforium appeared<br />
white.<br />
Let the Comb now refi, and let the Paper<br />
be removed farther from the Prifm, and the<br />
feveral ranges of Colours will be dilated and<br />
expanded into one another more and more,<br />
and by mixing their Colours will dilute one a-<br />
nother, and at length, when the diitance of<br />
the Paper from the Comb is about a Foot, or a<br />
little more (fuppofe in the place 2 D 2 E) they<br />
will fo far dilute one another as to become<br />
white.<br />
With an)r obitacle let all the Light be now<br />
fiopp’d Vihlch pa& through any one interval<br />
of the Teeth, fo that the range of Colours which<br />
comes from thence may b.e taken away, and<br />
YOU will See .the Light of the refi of the ranges<br />
to be expanded into the place of the range’taken<br />
away, and there to be coloured. Let the j<br />
intercepted range pail on as before; and its<br />
C~~ours’falIing upon the ColourS of the dther<br />
ranges, and mixing with them, will r&ore. the<br />
whi tenek<br />
Let the Paper 233 2 E be now very mu∈<br />
sliwd to the Ragr.s, fo that the luolt refrangible<br />
-&a)s
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