Since, however, of what is peculiar to
anything part signifies its essence, while part does not, let us
divide the 'peculiar' into both the aforesaid parts, and call that
part which indicates the essence a 'definition', while of the
remainder let us adopt the terminology which is generally current
about these things, and speak of it as a 'property'. What we have
said, then, makes it clear that according to our present division, the
elements turn out to be four, all told, namely either property or
definition or genus or accident. Do not let any one suppose us to mean
that each of these enunciated by itself constitutes a proposition or
problem, but only that it is from these that both problems and
propositions are formed. The difference between a problem and a
proposition is a difference in the turn of the phrase. For if it be
put in this way, "'An animal that walks on two feet" is the definition
of man, is it not?' or '"Animal" is the genus of man, is it not?'
the result is a proposition: but if thus, 'Is "an animal that walks on
two feet" a definition of man or no?' [or 'Is "animal" his genus or
no?'] the result is a problem. Similarly too in other cases.
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