30

Logic II 30

in reproduction produces real classes, as by the very
force of the words it produces natural classes. In considering
the classification of sciences, however,
we do have no need of penetrating the mysteries of
biological development; for the generaion here is
of ideas by ideas, -- unless one is to say, with many
logicians, that ideas come arise from the consideration of
facts in which there are no such ideas, nor any ideas.
That opinion is a superficial one, allied on some one
side of it, to the notion that the only final cause is
a purpose. So, those logicians imagine that an idea
has to be connected with a brain, or has to inhere
in a "soul". This is preposterous: the idea does not belong
to the soul; it is the soul that belongs to the idea. The soul
does for the idea just what the cellulose does for the
Beauty of the rose; that is to say, it affords it opportunity.
It is the court-sheriff, the arm of the law.