cm the Planet Saturn. 5 
jtfelf. The fame reafons which prove to us the folidity of tne 
one will be full as valid when applied to the other. Thus we 
fee, in fig. 3. and 4. the fhadow of the body of Saturn upon 
the ring, which, in fig. 3. is eclipfed towards the north, on 
the following fide, and in fig. 4. about the middle, according 
to the oppofite fituation of the fun. In the fame manner we 
fee the (hadow of the ring caft on tne planet, wheie in fig. 1. 
and 2. we find it on the equatorial part; and May 28, 1780, 
I faw it towards the fouth. If we deduce the quantity ot 
matter, contained in the body, from the power whereby the 
fatellites are kept in their orbits, and the time of their revolu- 
tion, it muft be remembered, that tne ring is included in the 
refult. It is alfo in a very particular manner evident, that 
the ring exerts a confiderable force upon thefe revolving bodies, 
fince we find them ftrongly affedled with many irregularities in 
their motions, which we cannot properly afcribe to any other 
caufe than the quantity of matter contained in the ring ; at leaft 
we ought to allow it a proper fhare in the efifedl, as we do not 
deny but that the confiderable equatorial elevation of Saturn, 
which l {hall eftablifh hereafter, muft alfo join in it. 
The light of the ring of Saturn is generally brighter than 
that of the planet: for inftance, April 19, 1 777 ’ ^ law the 
fouthern part of the ring, which pafled before the body, very 
plainly brighter than the difk of Saturn, on which it was pro- 
jefted ; and on the 27th of the fame month, I found, that 
with a power of 410, my feven-feet reflector had haidly light 
enough for Saturn, when the ring was notwithstanding fuffi- 
ciently bright. Again, the 11th of Marco, 1780, I tried the 
powers of 222, 332 , and 449* fucceftively, and found the 
light of Saturn lefs intenfe than that of the ring ; the colon 1 
of the body with the high powers turning to a kind of yellow, 
„ while 
