41

Logic II 41

{Section title: Classification according to Final Causes.}

their boundaries differently drawn. After all, boundary
lines may be [?] [?] in some cases can only be
artificial, although the classes are natural, as we
saw in the case of the kets. When one can lay one's finger
upon the purpose to which a class of things owes its origin,
then indeed abstract definition may formulate that
purpose. But when one cannot do that, but one
can trace the genesis of a class and see ascertain how several
have been derived by different lines of descent from one
less specialized form, this is the best way of getting route toward an
understanding of what the natural classes are. This
is true even in biology: it is much more clearly so
when the objects generated are, like sciences, themselves
of the nature of ideas.

{Section title: Classification by Ideas Types.}

There are cases where we are quite in the dark,
alike concerning the creating purpose and the concering
the genesis of things; but where we find a system of classes