34 D. Trowbridge on the Nebular Hypothesis. 
known, we cannot compute the radii of gyration of the planets 
at the time when the satellite rings were abandoned, as we have 
done in the case of Jupiter. And if Bessel’s mass of the rings: 
of Saturn (;}sth of that of Saturn) be admitted, it is probab 
that this, and the sum of the masses of the satellites, will make 
a fraction too great to be neglected. The same is true of the 
earth an 
49. L 
facts which ought to be found to exist in the Solar System, ac 
Sth. The satellites should revolve around their primaries in th 
ith. Th 
of the Solar system should be composed of similar materials. 
50. We have thus, in the preceding pages, attempted to give 
& connected view of the nebular hypothesis, uncompared, ex- 
cept in a few cases, with the real phenomena of nature. In 
what follows, we shall show that the phenomena of the sidereal | 
eavens, and of the Solar System, agree very closely with the 
preceding deductions, 
51. The origin of material existence is at present a mystery 
to the human mind. To say that it was created by the Deit: 
18 An assertion that conveys to the understanding something o 
