the density of the central parts must be nearly
thirty times greater than the density of the surface of the ocean. The
ratio of the gravitating forces of these two particles is, therefore,
less than the ratio of their respective radii, and the axifugal tendency
of the particle at n is more than proportionally restrained by the
central gravitation; and hence m will move towards the equator, and n
towards the poles, as represented in the Fig.

It is on account of the overwhelming momentum of the surface waters of
the South Pacific over the North, that the Pacific, at Panama, stands
six or seven feet higher than the Atlantic. We shall again allude to
this interesting fact.

According to newspaper reports of a lecture, delivered in New York, by
Lieut. Maury, U. S. N., this gentleman endeavors to explain the currents
of the ocean, by referring them to evaporation in the tropics. The vapor
leaves the salt of the water behind, and thus, by continual
accumulation, the specific gravity of the tropical waters is greater
than that of the superficial waters nearer the poles; the lighter
water, therefore, passes towards the equator, and the heavier water
below, towards the poles. If this be a correct statement of that
gentleman's theory, fidelity to our standards compels us to question the
soundness of the conclusion. The mere fact of the surface water of the
ocean being lighter than that of the bottom, cannot on any known
principles of science cause any movement of the surface waters towards
the equator. When such an acute and practical physicist is driven, by
the palpability of the fact that the polar waters are continually
tending towards the equator, to seek the cause in the tropical
evaporation, it shows that the dogma, which teaches that rotation can
produce no motion, is unsound.

Sir John Herschel, in speaking of the solar spots, says: "We may also
observe that the tranquillity of the sun's polar, as compared with his
equatorial regions (if his spots be really atmospheric), cannot be
accounted for by its rotation on its axis only, but must arise from some
cause external to the sun, as we see the belts of Jupiter and Saturn and
our trade winds arise from a cause external to these planets combining
itself with their rotations, which _alone_ (and he lays an emphasis on
the word) can produce no motions when once the form of equilibrium is
attained."

With respect to the origin of the solar spots, we have no disposition to