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hg into the Regions of the black, acid’ therea<br />
fore they appcnr in a contl!ary order to that,<br />
when a,white Ob.jcCt is f~~~oundcd with blaclr.<br />
And the fume is co be under-itood when anObjeti<br />
is viewed, whdfe parts are lbme of thein<br />
lefs luminous than othek. For in the borders<br />
of the more and lefs luminous parts, Colours<br />
ought alq7ays by the fame Principl.es to arife<br />
‘from the Excefs of the Light of the more luminous,<br />
and to be of the fame kind as if the<br />
darkerk parts w’ero black, but’ yet to be .inorc<br />
f&t and dilute.<br />
‘What is kid of Calours made by Prifins may<br />
be eajily applied to Colours made by the GlafTe~<br />
of Telefcopes or Microkopes, or by the Humours<br />
of the Eye. For if the Ob~je&gl.afs of<br />
a ‘I’elefcopebe thicker on one lide than on the<br />
other, or if one half of the GM’s, or one half<br />
of the Pupil of the Eye be covcr’d with any<br />
opalre fubftance : the Objekt-g+afs, or that part<br />
of it dr of fhe Eye which is not cover’d , may<br />
be .confider’d zis a Wedge with crooked Sides,<br />
and every Wedge of Glafs or other pellucid<br />
Subllance has the efie& of a Priiin in refra&ing<br />
the Light which pares through it.<br />
I-hw ‘the Colours in the ninth and tenthEx<br />
periments of’ the firft: Parr @k ‘from, the different<br />
Wcflexibility of Light, is evident by ~7hat,<br />
~721s there faid. $ut it is oblrvnble in the ninth<br />
Experiment, that whillt the S$n’s dir& Light<br />
is yellow, the Excel‘s of the ~~l~xwx~~cii~g Rays<br />
in the reflekked beam of Li& MN, ii~ffices<br />
ody to bring that yellou7 to SL pale whj.te ill&+<br />
ning to blue, and not to tinge it wit.h a.ma&<br />
fifilj!
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