the universe, the more do they correspond with our experience of the
nice adaptation of the means to the end which obtains in our own globe,
and we can only judge of other planets by the analogies around us. Here,
there, are extremes of temperature it is true: it is necessary there
should be, and we can see and understand the necessity in all such
cases, and how they conduce to the general average of good. But,
astronomers can give no reason why it is necessary that some planets of
our system should be placed so remote that the sun is frittered down to
a star, whose heatless light is but a mockery to those frigid realms.

Now, according to this theory, the temperature of Neptune may be far
more uniform and conducive to life than that of our own globe. The
chilling influence of the solar stream at that planet being nearly null,
and the temperature of the surrounding space far greater. So also
Mercury, instead of being the burning planet of the schools, may suffer
the most from cold.

The planet Mars is generally considered, of all the members of the
system, most nearly to resemble our own world. The telescope not only
reveals seas and continents, but the snowy circles round his poles,
which appear to increase and diminish, as his winter is beginning or
ending. This planet's ecliptic is similar to our own in inclination or
obliquity, his distance, also, is far greater, and his winter longer;
yet, for all this, his snow zones are less than on our own globe. This
anomalous fact has, we believe, never been noticed before; but it is
explicable on the theory, and therefore confirms it. Mars has no
satellite, and therefore his centre will be coincident with the centre
of the marsial vortex. There will be no _lateral vortices_ to derange
his atmosphere, and if the axis of his vortex coincides also with the
axis of the planet, the central vortex will be continually over the
poles, _and there will be no storms on the planet Mars_. A capital fact
connected with this, is the want of belts, as in Jupiter and Saturn; for
these planets have satellites, and if _they_ are not massive enough, the
belts may be produced by an obliquity in the axis of the Jovial and
Saturnial vortices. If Mars had an aurora like the earth, it is fair to
presume the telescope would ere this have shown it. He is, therefore, in
equilibrium. In applying this reasoning to the earth, we perceive that a
certain influence is due to the difference of temperature of