quintuple Belt on the Planet Saturn. * 31 
of Jupiter's satellites to be less than one-fourth of the diameter 
of the Georgian planet, which I have just been viewing. 
With 1200, it seems also to be less, in the same proportion. 
With 2400, I can plainly perceive the disk of the satellite. 
With 4800, the apparent diameter of the largest of the satel- 
lites is less than one-quarter of that of the Georgian planet. 
The analogy alluded to in the first paragraph of this paper, 
refers to the numerous parallel belts which we have noticed, 
in the above given observations, on the disks of Jupiter and 
Saturn. 
That belts are immediately connected with the rotation of 
the planets will hardly be denied, when those of Jupiter are so 
well known always to lie in the direction of its equatorial 
motion. Since, then, it appears that the belts of Saturn are 
very numerous, like those of Jupiter, and are also placed in the 
direction of the longest diameter of the planet, it may not be 
without some reason that we infer the period of the rotation 
of the former to be short, like that of the latter. 
The planet Mars, in all my observations, never presented 
itself with any parallel belts, nor do we observe such phseno- 
mena on the disk of Venus. The first is known to have a ro- 
tation much slower than Jupiter ; * and the latter, according 
to the accounts of Cassini and Bianchini, is certainly not 
one that moves quickly upon its axis. 
However, I do not mean to enter into the strength of an 
argument for a quick rotation of Saturn, that may be drawn 
from the condition of its belts. The circumstance of a quin- 
* Sea Phil. Trans. Yol. LXXI. Part I. page 134. 
