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receive impressions from the neighbouring
columns, and convey to the mind, through the
brain, information concerning wholly unrelated
matters ; although the Conscience (I mean the
conscious Reason) takes no note of them. They
enter the mind unperceived ; and this sort of
anconscious experience is always going on.
We have no conscious memory of this unconscious
 experience, Any experience which we
observed and were conscious of at the time, we
are able, more or less, to recall at will and reason
upon. But our will has no power of recalling
those other items of personal knowledge that
have been unconsciously absorbed. But they
are not for that dead or inactive. They are
absorbed and organized. So that a man holds,
hidden away from his memory, a vaster wealth of
knowledge than he is aware of, or can draw on at
pleasure.
One might map out the strata of the mind in
a sort of spatial diagram of three layers, the
deepest being the inherited animal Instincts;
the uppermost the conscious Intellect or Reason ;
and between these two would lie the region of