[ 459 ] 
the narrow belt, which had difappeared, appeared again cn the 
eaftern fide. At 4’' 30' it was advanced ^ of the diameter. At 
5** 58' it extended almoft from one limb to the other, as narrow 
and fenfible as in fig. n° i. 
The 6th of September, 1760^ having computed the ingrefs of 
the third fatellite on l|.’s dilc, 1 viewed the Planet with a Gre- 
gorian refledlor of 30 inches focus, magnifying 104 times. At 
7*' 4'' I perceived at the center of the Planet, on the lov;er belt, 
a black fpot, pretty round, and nearly of the fize of the fhadow 
of the firft fatellite. I guefled this fpot to be the fhadow of 
the third. I obferved its progrefs, and being got on y of 21 
difc, at 8’’ 13' I psrceivecj the fhadow of the third juft entered on 
If ’s eaftern limb, and was larger than that I obferved before, 
which made me to imagine, that the firft fliadow might be a fpot 
on the very difc of the third fatellite. 1 went on with my ob- 
fervations, and found, that the nearer this fhadow approached 
the weftern limb of If, the more it was diminifhed in fize, and I 
loft fight of it before it had got to the Planet’s limb. Laftly, at 
9** 26', the third fatellite was half emerged, and formed an in- 
dentation on the difc. I was then well fatisfied, that the ob- 
ferved fpot was on the difc of the third fatellite; and I took no- 
tice, that this fatellite, when quite emerged, was not fo luminous 
as ufual. 
The 28th of March, 1766, having viewed Saturn with the 
fame achromatic refledlor of 10 feet 7 inches focus* I perceived 
on his globe two darkifh belts ; they were indeed extremely 
faint, and difficult to be difcerned, diredled, however, in a 
right line parallel to the longeft diameter of Saturn’s ring. 
The feveral obfervations here recited are extremely nice ; and 
it were to be wifhed that aftronomers, concerned in obfervations, 
might be accommodated with achromatic telefcopes, of the 
moft perfedl conftrudlion; as fuch are the only inftruments 
whereby a great knowledge of the celeftial bodies can be acquired^ 
for the improvement and perfection of aftronomy, 
K n n it 
pbfer; 
