C ”4 ] 
ihe thicknefs of the ring. 3. On the extremities 
of this, fome luminous points were perceived, 
which reflected the light more flrongly than the 
others. 4. I did not obferve a fenfible variation 
in the apparent diameter of the ring. 
I made ufe, for this obfervation, of a five-feet 
refledor of Mr. Short, of another of four of Mr. 
Nairne, and of an excellent acromatic telefcope of 
Mr. Dollond, to which I applied one of the 
ilrongefl and brightefl magnifiers. 
I afiure you, Sir, that I have given to this ob- 
fervation all the attention, which the importance 
of the matter required ; and this joined to three 
others, form a fet of obfervations on the planets, 
the occultations of fixed liars by the moon, and 
the Satellites of Jupiter. I lhall fend you a copy 
of the whole, if you think proper to prefent them 
to the Royal Society,, and will accept of my cor** 
refpondence. 
Don 
yefta el efpefor del anillo. 3. En los extremos de efte. fe per- 
cibian unos puntos luminol'os que refleftaban la luz con mas vi- 
veza que los otros. 4. En el diametro aparente del anillo no 
bubo una variation- fenfible. Me fervi para efta obfervacion de 
un. teleicopio de 5 pies de Mr. Short, de otro de 4 de Mr. Nairne, 
y de un excelente anteojo acromatico de Mr. Dollond, al qual 
aplique uno delos tubos mas fuertes y claros. 
Afeguro a vm. haver hecho efta obfervacion con toda la pro- 
o . . r „ 
lixidad, que pide la importancia de la materia, y con la milma 
tre formado un Quaderno de obfervaciones fobre los planetas, 
ocultaciones de eftrellas fixas per la Luna, y Satelites de Ju- 
piter. De todo embiare a vm. una copia, li guftare prefentarla- 
a la Sociedad Real, y admitir mi correfpondencia. 
