Opticks 1717 - Up

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at a good diltnnce from them. For by approachirig
nearci -, although in the fame incIiuation
of my&lye to the PlalIC Of k Rings, there
enlerged a .blctciih Colour out of the white,
wllich by dilating it felf I~OIT and more into
the bla&, render’d the CircIcs lcfs di.flinCif, and
J.& the white a little tinged with red and yel-
10~1~. I foulId ali’o by looking through a flit or
oblollg hole, which was narrOWC!~ than the Pupi1
of my Eye, alld held CMC to it parallel to
the J+iflns, I could fee the Ci~lcs lnuch difiin&r
alid vifibk to a far grcatcr INIII~C~ thau
othq-wife.
Y%J 4. To obferve more nicely the order
of the Colours which arofe out of the white
Circles as the Rays became MS and M’S inclined
to the Plate of Air ; 1 took two Ohje&-
g$&es, the one a Planocconvcx for a fourtceu
Foot Tclefcope , and the other a large double
Convex for one of about fifty Foot; and up011
this, laying the other with its plane fide do&lwards,
I prefid them fIowly together, to make
the Colours fiicccilivcly emerge in the middle
of the Circles, and then ilowly lifted the upper
Clafs from the lower to maltc them iirccefiivc-
Jy vanif’h again irz the fame place. The Colour,
which by preiIing the GM?es together emerged
Mt in the middle of the othc~- Colours, would
uponits firit appearance look like 3 Circle of a
to the center, and by comprcfI’ing the GlaKes Ml
more, grow continually brondcr until a new Col+r
emerged in its ccntcr, and thcrcby it bcpamc
a Ring encnmpafIing that new Colow-, And by