Some of
these qualities in man, as compared with the corresponding qualities
in animals, differ only quantitatively: that is to say, a man has more
or less of this quality, and an animal has more or less of some other;
other qualities in man are represented by analogous and not
identical qualities: for instance, just as in man we find knowledge,
wisdom, and sagacity, so in certain animals there exists some other
natural potentiality akin to these. The truth of this statement will
be the more clearly apprehended if we have regard to the phenomena
of childhood: for in children may be observed the traces and seeds
of what will one day be settled psychological habits, though
psychologically a child hardly differs for the time being from an
animal; so that one is quite justified in saying that, as regards
man and animals, certain psychical qualities are identical with one
another, whilst others resemble, and others are analogous to, each
other.
Nature proceeds little by little from things lifeless to
animal life in such a way that it is impossible to determine the exact
line of demarcation, nor on which side thereof an intermediate form
should lie.
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