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fo far acquiefce, that he only wifhes,that his own Gladys would 
ihew him thofe differences. Next to the Objection, made by 
Monfieur Au^put, againft Signor Campani , touching the Propor- 
tion of the Length of the Ring to its breadth^w/w replyeth, 
that the Glaffes of Monfieur Au?gutfi\Qw not all the particulars, 
that his do, and therefore are unfit for determining the true 
Figure and breadth of the apparent Ellipfis of the Ring. To 
which M. rejoyns, that he is difpleafed at his being de- 
ftitute of better Glaffes, but that it will be very hard for the fu- 
ture to convin czCampani touching thzProporttonot the/??«g,feing 
that the breadth of the Ellipfis is always diminifhing, although, 
if the declination of the Ring remains always the fame, one 
can at alltimes know, which may have been its greateft breadth. 
But he affures^that the breadth of the Ring is not the half of its 
length, and that it doth not fpread out fo much beyond Saturn's 
Body, as he hath alleged, And withal defirs to know, what can be 
anfwered by Sig. Campani to M. Hugens ^ who being perfuaded, 
that theDeclination of the Ring is not above 23 deg. 30' having 
feen the Ring to fpread out above the Body of Saturn , con- 
cludes, in a Letter to M.Au^out, that the length of the Ring is 
more than treble the Diameter of Saturn s body,which,according 
to Campanils only as about 6 7 to 31. Which difference yet dos 
not appear to M. Au^eut to be fo great ; but that M, Rugens per- 
haps will impute it to the Optical reafon, which he {Au^out^h^th. 
alleged of the Advance of the light upon the obfcure fpace, 
although he is ofOpinion,he fhould not have concluded fogreat 
a Length, if he had not feen the Breadth fpread out more, than 
he hath done : for ( faith he ) if the Length of the Ring be to 
the body of Saturn , as a=§ to 1. and the Inclination be 23 dec. 30' 
the Ring will be juft as large, as the body, without fpreadino- out; 
but if the Ring be bigger,it will a little fpread out j and if it were 
treble.it muft needs fpread out the half of its breadth, which 
hath not fo appeared to him. 
Further, to M. Auzput's change of Opinion, and believing, that 
the Advance or Sally, feen by him in Jupiter , was the Jhadorv of 
one of his Moons ^Campani declares, that he would not have him 
guilty of that change : Whereupon M* Amgut wonders, why 
Campani then hath not marked it in his Figure » and would glad- 
