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hv and red 3 and in changing Colour came<br />
nelifer and nearer to chc red Image made by<br />
the other Prifm, until w711en it Was alib red both<br />
~IIXL~CS becmie f’ully co-incidult.<br />
I placed all’0 two .Paper Circles verv near one<br />
a~~-)ther, the one in the red Light of &ePrilin,<br />
arid the other in the violet Light of the other.<br />
Tile Cir:lcs \VCTC each of them an Inch in dian?e;c~,,<br />
:liltl I-)chjud them the Wall WZIS ~1~1~ that<br />
thl: $txpcrir:~ei~t might not be diiturbed by any<br />
~~i;~~~;: coming i?om thence. Thefe Circles thus<br />
i~iuminared, .8: viewed through a Prifm fo held<br />
tk-it ; x -&cfrai”tion might be made towards the<br />
red :.~~irclc, Xtd ;IS I LVCIlt fTOYi1 tilC31 they CXX<br />
Ilc:ni.t’r and IJCNW together, a:ld at length be-<br />
CNTlC: co-incident ; and afterwards I’i:llen I went<br />
iSill. f~rthcr 03; they parted again in a contrary<br />
.Ql.dcY, the violet by a greater R.efra&ion being<br />
cari?ed be 011% the red.<br />
4’<br />
E‘xjer. b. In S~mn~er when the Sun’s Light<br />
ufes to be f?~rongcft, I placed a Prifm nt the<br />
hole of the LVindo~r7-~hnt, as in the third Experiment,<br />
yet fo that its Axis might be parallel tq<br />
the Axis of the Ikjorld 9 and at the oppofite<br />
Wall in the Sun’s refraCted Light, H placed arp<br />
gpen Book. Then going fix Feet and two Inches<br />
from the I3?ok, I placed there the abovementioned<br />
Lens, by which the Light refle&ed<br />
from the Book might be made to com7ergeand<br />
meet again at the diitance of iis Feet and two<br />
Inches behind the Lens ) and. there’ paint t-hi:<br />
Speci,es of the Book upon a O-meet: of white~E”a~<br />
per much after the manner of the fecond Exge+jment.<br />
‘Ibe ]Boqk and kens being made fait,<br />
I no-
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