3
We shall be in perfect possession of the way to proceed when we
are in a position like that which we occupy in regard to rhetoric
and medicine and faculties of that kind: this means the doing of
that which we choose with the materials that are available. For it
is not every method that the rhetorician will employ to persuade, or
the doctor to heal; still, if he omits none of the available means, we
shall say that his grasp of the science is adequate.
4
First, then, we must see of what parts our inquiry consists. Now
if we were to grasp (a) with reference to how many, and what kind
of, things arguments take place, and with what materials they start,
and (h) how we are to become well supplied with these, we should
have sufficiently won our goal. Now the materials with which arguments
start are equal in number, and are identical, with the subjects on
which reasonings take place. For arguments start with
'propositions', while the subjects on which reasonings take place
are 'problems'. Now every proposition and every problem indicates
either a genus or a peculiarity or an accident-for the differentia
too, applying as it does to a class (or genus), should be ranked
together with the genus.
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