The existence of a
periodical action of the sun and moon on the variations of terrestrial
magnetism is even at the present day extremely problematical. We have no
direct experimental knowledge regarding the properties and specific
qualities of the masses circulating in space, or of the matter of which they
are probably composed, if we except what may be derived from the fall of
aerolites or meteoric stones, which, as we have already observed, enter
within the limits of our terrestrial sphere. It will be sufficient here to
remark, that the direction and the excessive velocity of projection (a
velocity wholly planetary) manifested by these masses, render it more than
probable that
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they are small celestial bodies, which, being attracted by our planet, are
made to deviate from their original course, and thus reach the earth
enveloped in vapors, and in a high state of actual incandescence. The
familiar aspect of these asteroids, and the analogies which they present
with the minerals composing the earth's crust, undoubtedly afford ample
grounds for surprise,* but, in my opinion, the only conclusion to be drawn
from these facts is that, in general, planets and other sidereal masses,
which by the influence of a central body, have been agglomerated into rings
of vapor, and subsequently into spheroids, being integrant parts of the same
system, and having one common origin, may likewise be composed of substances
chemically identical.
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