( 693 ) 
equa!,and confequently about 48 deg,^6\ rhe refraftive power 
of Glafs being computed according to the Ratio of iht Swes 
i to 3. The diflance of the Prifm from the hole in the Shuts 
was about 2 inches ; The Room darkned to that degree as to 
equal the darkeft night , while the hole in the Shuts was o 
vered. 
Now as to Che ifTue of my Trials 5 I conftantly found the 
length of the coloured image C^ranfVeife to the axis of thie 
Prifm) confiderably greater than i:s breadth, as ofien as the 
Experiment was made on a clear day 5 but if a bright Cloud 
werenear the Sun , J fouiid it fometimes exadly as Mr, L/W 
wrote yoa, namely broader than long, efpecially while the 
Prifm was placed at a great diftance from the ho!e» Which 
Experiment will nor, I conceive, be queflioned by Mr, iVw- 
it being fo agreeable to the received la^^sof Refradtion?. 
And indeed the Obfervations of thefe two Learned perfons^ as 
to this particular , are eafily reconcileable to each other , and 
both to truth 5 Mr Newon (as appears by his Utter of Nov. 
laft, wherein more fully he delivers his mind) contending only - 
for the length of the Image (tranfverfe to the axis of the Prifm) 
in a very clear day whereas Mr. Line oY\\y mainfain'd the 
cxcefs of breadth, parallel to the fame axis, while the Sun is 
in a bright cloud. Though as to what is fiirther delivered by 
lAr.Newt0n(PhiLTranfa£}, N. So. /^. 3077 5 and oppofed by 
Mr. L/;?e, JSf.ii^.p. 5©i.) namely that the length of the co- 
loured Image was five^ times the diameter of its breadth*, I' 
never yet have found the excefs above thrice the diameter, or at' 
moft 3o while the refraftions on both fides the Frifin were 
equaU So much as to the matter of fad. 
Now as to Mr. Nervions Theory of Light ^Tid Colms^lcon- 
fefs, his neat Sett of very ingenious and natural inferences^was 
to me upon the firft perufal a ftrong conjefture in favour of his 
new do(9:rine ; I having formerly obferv'd the like chain of 
Inferences upon fearch into Natural truths. But fince fevera! 
experiments of Refraftions remain ftill untouched by him, I 
conceived, a further fearch into them would be very proper 
in order to a further difcovery of the truth of his Affertion. 
For, accordingly as they are found either agreeing with, or 
diragrecingfroiD, bis new Theory, they muft needs muchflreng- 
""^ thea 
