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the top of the 12ubble, 1 found that they $&+<br />
f&bly dilated by increnfillg the obliqui,ty, bti;’<br />
yet llot fo much by far as thofe m\d~ by: rhinu’d,<br />
Air in the feventb QbfervatiolI. EON. there they*<br />
were dilated fcj xnuch as, M&CI; view’d moi7c c$-.<br />
liquely, to arrive at; a part ol- the Plate mar@<br />
tl12111 t-.7elve tinles tblcker thatl that where they<br />
appfd when viewed perpendl~ulnrly ; Wkre-<br />
;1s ill this cafe the, th~Ckll& Of thC: !&‘RtCr, at<br />
which they arrived Wh viewed lll$ oblique:<br />
ly, W;IS to that thicl~nefs ~7111ch exhd+.ted the&<br />
by per~cndicular fomething lefs than a~<br />
8 to 5. J3p the, beit of my Ol$xvat;ions it was<br />
bct~~~eell 15’ and 1.5 :- ta ro 3 an incrcnfe nbo~ii<br />
~4 times lefs than in the other cd?.<br />
Somctines, $lle P3ubble Would becCIlzik of ati<br />
uniform thicknefs all Over5 except at the top of<br />
it: ilear the bltick Spot; as I knew, becauk it<br />
~,~~o~dcl exhibit the he iip~e;tl:alYX CSf Colour$<br />
in all Pofitions of the EyC. Ad the11 the Co-<br />
Iours whifg1.i were km at its :ipjxiiTpt cimimfe:.<br />
mice by the obliqueit Rays, wdcl be difkren~<br />
fi-oin thafe that were ken in other places~ byi<br />
Rays lefs oblique toq it. And diver’s Spe&atorg<br />
might fee the, fame pnl-t of it of difkring (202.<br />
lows, by viewing iC at very diUkrin~ Obliqui:<br />
ties. Ncjv7 obferving how much the Cololks ;iti<br />
the fame places of the BuHAe, or at divei pl&<br />
ces of equal thiclrnefs, were v+zd by the fez<br />
veral Obliquities of thekt 7s ; by the Mftnncti<br />
of the 4th, I& x6th an (4 nr8th Obfcrv;itioi~s~<br />
as they are hereafter &+in’d, I colle& th@<br />
thi,c&nefs of the Water requifitc io exhibit an?<br />
one and the fame CO~OW~ at bard Obli@tiesg<br />
ta
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