i7^) 
fo far acquiefcCj that he only wiflies,that his own GlafTes would 
lliew him thofe differences. Next to the Objection, made by 
Monfieur^&!:^^^^^; againftSignor Ci2w/<3/2i3 touching the Propor- 
tion of the Length of the J{ing to its hrcd.dthXcimpani reply eth^ 
that the Glaffes of Monfieur Au^out^9[icv^ not all the particulars, 
that his do^ and therefore are unfit for determining the true 
Figure and breadth of the apparent Ellipfis of the HJng, To 
which M. ^?/:^oz/^rejoyns, that heis difpleafed at his being de- 
ftitute of better Glaffesibut that it will be very hard for the fu- 
ture to comlncQCampafii touching theProportton of the^^Vig/eino- 
that the breadth of the Ellipfis is always diminifliing, although^ 
if the declination of the ^ng remains always the fame, ©ne 
can at alltimes know, which may have been its greateft breadth. 
But he affures^that the breadth of the 7^/;2£ is not the half of its 
length, and that it doth not fpread out fo much beyond Saturn s 
Body,as he hath albged. And withal defirs to know, what can be 
anfwered by Sig. Campanito M Hugens^^ho being perfuaded, 
that theDeclination of the Ring is not above 23 deg. 30' having 
feen ih^'Ring to fpread out above the Body of con- 
cludesj in aLetter to M. that the length of the Eing is 
more than treble the Diameter o( Saturn s bodyjwhich^according 
to Campani jis only as about 67 to ^i. Which difference yet dos 
not appear to M. Au!i;out to be fo great 5 but that M, Mugens per- 
haps will impute it to the Opticalxeafon, which he {Au'!!^uf)\\2iX}s\ 
alleged of the Advance of the light upon the obfcure fpace ^ 
although he is ofOpinion,he fhoiild not have concluded fogreat 
a Length, if he had not feen the Breadth fpread out morCj than 
he hath done: for {faith he) if the Length of the T^?;?^ be to 
the body of as to i. and tht Inclination be 23 deg. 30' 
the willbe juftas large,asthe body,withoutfpreading out; 
but if the l{i?2g be bigger,it will a little fpread out 5 and if it were 
treble,itmuft needs fpread out the half of its breadth , which 
hath not fo appeared to him. 
Further, to M. Au^s^oufs change of OpinioUjand believing, that 
the Advance or Sally, feen by him in Jupiter , was the jhadovQ of 
one of his MoonSjffl^w/ptfw declares, that he would not have him 
guilty of that change : Whereupon M> wonders , why 
Campani then hath not marked it in his Figure i and would glad- 
ly 
