we find that these cubes are to each other, in the inverse
ratio of the squares of the planet's distances; for,

2.21^3 : 6.59^3 :: 1^2 : 5.2^2,

showing that both planets have condensed equally, allowing for the
difference of temperature at the beginning. And we shall find, beginning
at the sun, that the diameters of the nebulous planets, _ceteris
paribus_, diminish outwards, giving for the nebulous sun a diameter of
16,000,000 miles,[39] thus indicating his original great temperature.

That the original nebulous planets did rotate in the same time as they
do at present, is proved by Saturn's ring; for if we make the
calculation, about twice the diameter of Saturn. Now, the diameter of
the planet is about 80,000 miles, which will also be the semi-diameter
of the nebulous planet; and the middle of the outer ring has also a
semi-diameter of 80,000 miles; therefore, the ring is the equatorial
portion of the original nebulous planet, and ought, on this theory, to
rotate in the same time as Saturn. According to Sir John Herschel,
Saturn rotates in 10 hours, 29 minutes, and 17 seconds, and the ring
rotates in 10 hours, 29 minutes, and 17 seconds: yet this is not the
periodic time of a satellite, at the distance of the middle of the ring;
neither ought the rings to rotate in the same time; yet as far as
observation can be trusted, both the inner and outer ring do actually
rotate in the same time. The truth is, the ring rotates too fast, if we
derive its centrifugal force from the analogy of its satellites; but it
is, no doubt, in equilibrium; and the effective mass of Saturn on the
satellites is less than the true mass, in consequence of his radial
stream being immensely increased by the additional force impressed on
the ether, by the centrifugal velocity of the ring. If this be so, the
mass of Saturn, derived from one of the inner satellites, will be less
than the same mass derived from the great satellite, whose orbit is
considerably inclined. The analogy we have mentioned, between the
diameters of the nebulous planets and their distances, does not hold
good in the case of Saturn, for the reason already assigned, viz.: that
the nebulous planet was probably not a globe, but a cylindrical ring,
vacant around the axis, as there is reason to suppose is the case at
present.

And now we have to ask the question, Did the ether involved in the
nebulous planets rotate in the same time? This does not necessarily
follow. The eth