No very abstruse argumentation is needed, in the first place, to prove
that the powers, or faculties, of all kinds of living matter, diverse as
they may be in degree, are substantially similar in kind.
Goethe has condensed a survey of all powers of mankind into the
well-known epigram:--
"Warum treibt sich das Volk so und schreit? Es will sich ernaehren,
Kinder zeugen, und die naehren so gut es vermag.
* * * * *
Weiter bringt es kein Mensch, stell' er sich wie er auch will."[50]
In physiological language this means, that all the multifarious and
complicated activities of man are comprehensible under three categories.
Either they are immediately directed towards the maintenance and
development of the body, or they effect transitory changes in the
relative positions of parts of the body, or they tend towards the
continuance of the species. Even those manifestions of intellect, of
feeling, and of will, which we rightly name the higher faculties, are
not excluded from this classification, inasmuch as to every one but the
subject of them, they are known only as transitory changes in the
relative positions of parts of the body.
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