ARH SA 2997 01M 
_., (MIICROGRAP EIA. 
: 61 
way with the -firft, namely, |the 3; 570 9. 119@sc.) but all, the, Globules 
J intespolted betweenthem in'the even placess namely,the 2.4.6:8.10.0c. 
mutt be the quite contrary:3:whence,according to the GartefianHypothefis, — 
there muft be no diftin&.colour generateds-buta confulion.: , Next, fince 
theCartefian Globuliarefappos.d (Principiornm Philofoph.\Part..24:$§686.) 
tobeeachof them continually. ini motion abont their;centets;:Iycannot 
conceive how>theeye: isable to-diftinguifh this nev generated motion 
from ‘theiriformer inherentene, if Fmay forall that other wherewith. they 
are nov'dior:turbivated, from fome other caufethan refraction. 5;And 
thirdly, I;cannot ‘conceive how: thefe motions thould,not happen fome- 
-pithes to oppofe each other; and ithen; in‘ftead of a rétation,. there would 
be nothing but a:direCt ‘motion generated,-and confequently no, colour. 
And fourthly, 1 cannot conceive, how bythe Cartefiaz Eypothefis itis pof- 
‘toigive any plaufible reafon ofthe nature of the:-Colours generated 
in the thin /amine of thefe our Afcrofcopical Obfervations ; for in-many: of 
thefe,therefracing and reflecting farfaces ane! paralleltoeachiothersand. 
confequently no retatioz can be generated, »non is:there any: ieceffity of 
aifhadow or terminaticn of the bright-Rayss fuch as; is fuppos'd (hap. 8. 
§.5.Etpreterca obfervavi umbram quoque,aut lint ationem lumiuss requiri : 
and Chap. 8- §. 9.) vo be:neceflaryi to;the: generation of any diftinct, co- : 
lours 5 Befides that, here isioftentimes one colour generated without any 
of ji other appendant ones, which cannot be bythe Cartefiaw Hy- 
poimepsc 35 -sy\) .O ebiswor oh vanssags © biswos risc odd tig 9. 
colour. And upointhe examination of the thing, I cannot;conceive any 
wonemore general, infeparable; xix ialichesngishass that which [have be- , 
fore affign'd. That we may therefore fee how exactly out Hypothefis 
agreesalfo with the Phanomena:of the refracting round -body. whether 
Globe or Cylinder, we {hall next fubjoyn our Calculation or Examer 
of tits: 26 22200. on) daivostes yitdsye bas uttace rvediat suds wsdio 
2s Andto this end, we willbcalculate any two Rayse as forinftance 3Jet schem. é. 
EF beaRaycutting:the Redins)C-D (divided: into: 20. parts)in'G,.46, Fz: 3- 
uparts diftant from C, andief another Ray; which cuts the fame Radins 
an‘g~17: parts diftant,thefe will be:refraéted.to Kiand:4, and from thenoe 
stefietied oN andi z, ‘and from thencerefrafted coward P. and pi, there- ae 
fore the Atch F f wilk:beos.4 5!:cThe Arch. F K:1064s30'sthe Arch f & BALES 
cron? -2°) The line F }G6d00:and:fig 5267. therefore ’f2733. therefore ae 
Fe 980, almoftiTheline F K 16024-4nd f k45436: thereforeNd 196. se 
land %.6147-almoft, the line Nn:torg the!ArcheN # 5.4; 512 therefore 
‘the Angle) Niza is 34:4: 43’. therefore the Angle Nox. is 139.4 56’. 
~which is almoft: 50.40 more than-arightAnglesi io bebiscivbocwel. — * 
©:olt is evidentthereford by this Hypothefis, thavat|the fame time chate,f 
touches f EF is arrived at ¢ And by that time e fk xvisgotitosx,; 
EFKN is got to d, and when it touches Ny the pulfe ofitheotherRay 
‘is: got to 5: and no farther; whichis very fhort of the place it dhould have 
varriv'd to,to make the Ray 2p to-cut the or bicnlar. paleo IN eat right 
Angles : therefore the Angle Nop is an acute Angle, but the gga aS 
| rary Bagh 
id 
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