A, Hinrichs on the Density, Rotation, and Age of the Planets. 47 
For in the first place Titan was the first moon which was seen 
(Huyghens, 1655), so we may conclude its mass to be great 
enough to afford a safe comparison with Saturn in the scale of 
Planetary Masses. Rhea, first discovered by Cassini (1672), 
therefore appears to be less considerable, confirming our conclu- 
sio d on its comparatively too great dislocation; and 
finally Hyperion required for its discovery the best telescopes of 
modern times (Bond and Lassell, 1848), thus proving itself to be 
but a small moon. 
Thus the configuration of the lunar world of Saturn corres- 
n 
Plants and animals. So likewise in geology all is confusion if 
We consider the strata in situ, as they are observed to be now ; 
but this chaos gives way for harmony and symmetry if we admit 
We rely on inductive reasoning in the explanation of the facts 
observed in the one case—why, then, not as well in the similar 
case afforded by the more grand dislocation of the strata of the 
Universe ? 
Of course, we would not refer this to practical astronomy, for 
the ephemeris is exact enough without taking this resistance 
into account; but in theoretical astronomy, when discussing the 
slability of the solar system, I think it has been shown. that this 
force ought not to be omitted. | 
_ * The r lar develo ; ‘olk of egg: ion is especially 
itt tis comneion n 7 melon 
