Whence this fatality,
and whither does it lead? It comes from heredity, and it leads to
propagation. When we ask how heredity could be started or transmitted, our
ignorance of nature and of past time reduces us to silence or to wild
conjectures. Something--let us call it matter--must always have existed,
and some of its parts, under pressure of the others, must have got tied up
into knots, like the mainspring of a watch, in such a violent and unhappy
manner that when the pressure is relaxed they fly open as fast as they
can, and unravel themselves with a vast sense of relief. Hence the longing
to satisfy latent passions, with the fugitive pleasure in doing so. But
the external agencies that originally wound up that mainspring never
cease to operate; every fresh stimulus gives it another turn, until it
snaps, or grows flaccid, or is unhinged. Moreover, from time to time, when
circumstances change, these external agencies may encrust that primary
organ with minor organs attached to it. Every impression, every adventure,
leaves a trace or rather a seed behind it. It produces a further
complication in the structure of the body, a fresh charge, which tends to
repeat the impressed motion in season and out of season. Hence that
perpetual docility or ductility in living substance which enables it to
learn tricks, to remember facts, and (when the seeds of past experiences
marry and cross in the brain) to imagine new experiences, pleasing or
horrible. Every act initiates a new habit and may implant a new instinct.
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