If, then, you are overthrowing a view, it is useful to see
whether the genus fails to be predicated in the category of essence of
those things of which the species too is predicated. If establishing a
view, it is useful to see whether it is predicated in the category
of essence: for if so, the result will be that the genus and the
species will be predicated of the same object in the category of
essence, so that the same object falls under two genera: the genera
must therefore of necessity be subordinate one to the other, and
therefore if it be shown that the one we wish to establish as genus is
not subordinate to the species, clearly the species would be
subordinate to it, so that you may take it as shown that it is the
genus.
Look, also, at the definitions of the genera, and see whether they
apply both to the given species and to the objects which partake of
the species. For of necessity the definitions of its genera must be
predicated of the species and of the objects which partake of the
species: if, then, there be anywhere a discrepancy, clearly what has
been rendered is not the genus.
Again, see if he has rendered the differentia as the genus, e.
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