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thus to give not only to professed students, but to others
with the necessary bias, industry, and capacity, an intelli-
gent interest in the operations of science. Time and labor
are necessary to this result, but science is the gainer from
the public sympathy thus created.

How, then, are those hidden things to be revealed ?
How, for example, are we to lay hold of the physical basis
of light, since, like that of life itself, it lies entirely without
the domain of the senses ? Philosophers may be right in
affirming that we cannot transcend experience ; but we can
at all events carry it a long way from its origin. We can also
magnify, diminish, qualify, and combine experiences, so as to
render them fit for purposes entirely new. We are gifted
with the power of imagination—combining what the Ger-
mans call Anschauungsgabe and Einbildungskraft—and by
this power We can lighten the darkness which surrounds the
world of the senses. There are tories even in science who
regard imagination as a faculty to be feared and avoided
rather than employed. They had observed its action in
weak vessels, and were unduly impressed by its disasters.
But they might with equal justice-point to exploded boil-
ers as an argument against the use of steam. Bounded and
conditioned by cooperant Reason, imagination becomes the
mightiest instrument of the physical discoverer. Newton’s
passage from a falling apple to a falling moon was, at the
outset, a leap of the imagination. When -William Thom-
son tries to place the ultimate particles of matter between
his compass-points, and to apply to them a scale of milli-
metres, he is powerfully aided by this faculty. And in
much that has been recently said about protOplasm and
life, we have the outgoings of the imagination guided and
controlled by the known analogies of science. In fact,
without this power, our knowledge of Nature would be a
mere tabulation of coexistences and sequences. We should
still believe in the succession of day and night, of summer

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