42

78

acquainted. Induction may, of course, be
strengthened or weakened by the addition of other modes
of argument leading to the same conclusion
or to a contrary conclusion.
It may also be strengthened or weakened by arguments
which do not directly affect
the conclusion of the induction but which
increase or diminish the strength of its procedure.
There are in particular four
kinds of uniformities which may greatly
affect an induction.

In the first place the members of a
class may present a greater or less
general resemblance as regards
certain kinds of characters. Birds
for example are, generally speaking,