how thought, again, and feeling are inseparable from one another, he
will be compelled to suppose corresponding successions of material
processes, which generate and are closely connected with one another,
and which attend the whole machinery of conscious life, according to
the law of the functional interdependence of matter and
consciousness.


After this explanation I shall venture to regard under a single
aspect a great series of phenomena which apparently have nothing to
do with one another, and which belong partly to the conscious and
partly to the unconscious life of organised beings. I shall regard
them as the outcome of one and the same primary force of organised
matter--namely, its memory or power of reproduction.

The word "memory" is often understood as though it meant nothing more
than our faculty of intentionally reproducing ideas or series of
ideas. But when the figures and events of bygone days rise up again
unbidden in our minds, is not this also an act of recollection or
memory? We have a perfect right to extend our conception of memory
so as to make it embrace involuntary reproductions, of sensations,
ideas, perceptions, and efforts; but we find, on having done so, that
we have so far enlarged her boundaries that she proves to be an
ultimate and original power, the source, and at the same time the
unifying bond, of our whole conscious life.

We know that when an impression, or a series of impressions, has been
made upon our senses for a long time, and always in the same way, it
may come to impress itself in such a manner upon the so-called sense-
memory that hours afterwards, and though a hundred other things have