OUTLINES OF NATURAL PHILOSOPHY. 



It appears, therefore, that there are really two con- 

 centric rings, or perhaps more. 



" .&' *' 

 200. The ring revolves on an axis at right 



angles to its own plane nearly, in the same time 

 with the planet itself, or in a little more than 

 ten hours. 



This observation we also owe to Dr HERSCHEL. 



. The time of the revolution of the ring is .437 of 

 a day, or IQh 29 17 s . 



b.It is remarkable, that if a satellite at the mean dis- 

 tance of the middle of the ring, revolved round Sa- 

 turn, and obeyed the law of KEPLER in respect of 

 the other satellites, it would revolve exactly in 

 17 s . BIOT, Astron. Phys. torn. in. p. 96. 



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