[footnote] * On the question already discussed by Newton, regarding the
difference existing between the attraction of masses and molecular
attraction, see Laplace, 'Exposition du Systeme du Monde', p. 384, and
supplement to book x. of the 'Mecanique Celeste', p. 3, 4; Kant, 'Metaph.
Anfangegrunde der Naturwissenschaft, S??m. Werke', 1839, bd. v., s. 309
(Metaphysical Principles of the Natural Sciences); Pectet, 'Physique', 1838,
vol. i., p. 59-63.
If we except the small asteroids, which appear to us under the forms of
aerolites and shooting stars, the regions of space have hitherto presented
to our direct observation physical phenomena alone; and in the case of
these, we know only with certainty the effects depending upon the
quantitative relations of matter of the distribution of masses. The
phenomena of the regions of space may consequently be considered as
influenced by simple dynamical laws -- the laws of motion.
The effects that may arise from the specific difference and the
hererogeneous nature of matter have not hitherto entered into our
calculations of the mechanism of the heavens. The only means by which the
inhabitants of our planet can enter into relation with the matter contained
within the regions of space, whether existing in scattered forms or united
into large spheroids, is by the phenomena of light, the propagation of the
force of gravitation or the attraction of masses.
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