Now the primary term is a genus, and
this term taken in conjunction with its differentiae is a genus:
moreover the differentiae are all included, because there is now no
further differentia; if there were, the final concrete would admit
of division into species, which, we said, is not the case.
To resume our account of the right method of investigation: We
must start by observing a set of similar-i.e. specifically
identical-individuals, and consider what element they have in
common. We must then apply the same process to another set of
individuals which belong to one species and are generically but not
specifically identical with the former set. When we have established
what the common element is in all members of this second species,
and likewise in members of further species, we should again consider
whether the results established possess any identity, and persevere
until we reach a single formula, since this will be the definition
of the thing. But if we reach not one formula but two or more,
evidently the definiendum cannot be one thing but must be more than
one. I may illustrate my meaning as follows. If we were inquiring what
the essential nature of pride is, we should examine instances of proud
men we know of to see what, as such, they have in common; e.
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