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and vibrations, and waves, which eye has never seen nor
ear heard, and which can only be discerned by the exercise
of imagination. This, in fact, is the faculty Which enables
us to transcend the boundaries of sense, and connect the-
phenomena of our visible world with those of an invisible
one. Without imagination we never could have risen to
the conceptions which have occupied us here to-day; and
in proportion to your power of exercising this faculty aright,
and of associating definite mental images with the terms
employed, will be the pleasure and the profit which you
will derive from this lecture. The outward facts of Nature
are insufficient to satisfy the mind. We cannot be content
with knowing that the light and heat of the sun illuminate
and warm the world. We are led irresistibly to inquire
what is light, and what is heat ? and this question leads us
at once out of the region of sense into that of imagination.

Thus pondering, and questioning, and striving to sup-
plement that which is felt and seen, but which is incom-
plete, by something unfelt and unseen which is necessary
to its completeness, men of genius have in part discerned,
not only the nature of light and heat, but also, through
them, the general relationship of natural phenomena. The
working power of Nature is the power of actual or poten-
tial motion, of which all its phenomena are but special
forms. This motion -manifests itself in tangible and in in-
tangible matter, being incessantly transferred from the one
to the other, and incessantly transformed by the change.
It is as real in the waves of the ether as in the waves of
the sea; the latter, derived as they are from winds, which
in their turn are derived from the sun, being nothing more
than the heaped-up motion of the former. It is- the calo-
rific waves emitted by the sun which heat our air, produce
our winds, and hence agitate our ocean. And whether they
break in foam upon the shore, or rub silently against the
ocean’s bed, or subside by the mutual friction of their own

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