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that there are three orders of induction of
very different degrees of cogency although
they are all three indispensable.

The first order of induction, which I
will call Rudimentary Induction, or the Pooh-pooh argument, proceeds
from the premiss that the reasoner has
no evidence of the existence of any fact of
a given description and concludes that
there never was, is not, and never will
be any such thing. The justification
of this is that it goes by such light as
we have, and that truth is bound
eventually to come to light; and therefore
if this mode of reasoning temporarily
leads us away from the truth, yet steadily