Here the real essence will not be declared, and the definition will thus be incomplete; unless indeed it includes, along with the highest genus, the superadded mention of all the differentiae descending down to the lowest species.
Assuming the genus to be truly declared in the definition you will examine whether the differentiae enunciated aredifferentiae at all?
And, even if we say that the Genus does partake of the Differentiae, the same difficulty recurs, when the Differentiae are numerous.
If none of the differentiae belonging to a genus can be predicated of a species, neither can the genus itself be predicated thereof.
If it did, it would at one and the same time partake of Opposita, for the Differentiae are Opposita to each other.
The definition ought not to omit any of the differentiae of the definiend; if any be omitted, the real essence is not declared.
And, conversely, if the term be such that the differentiae applied to it are disparate, we may know it to be an equivocal term.
No man can know the Species without knowing its Genus and Differentiae; but you may know the Genus and Differentiae without knowing the Species; hence the Species is more unknowable than they are.
If, again, the term is used as a differentia for two genera quite distinct and independent of each other, it must be equivocal; for genera that are unconnected and not subordinate one to the other, have their differentiae also disparate.
Similarly the differentiae are predicated of the species and of the individuals.
Similarly, the definition of the differentiae will be applicable to the species and to the individuals.
If genera are different and co-ordinate, their differentiae are themselves different in kind.
Yet this is not peculiar to substance, for it is also the case that differentiae cannot be present in subjects.
It is the mark of substances and of differentiae that, in all propositions of which they form the predicate, they are predicated univocally.
Rectangular is one of the Differentiae of a geometrical square; it is merely one of the Accidentia of the table at which I am writing.
Differentiae for general purposes, and differentiae for special or technical purposes 141 7.
It is almost needless to say that by a definition as "logical" is meant one which, while including all the differentiae of the thing defined, excludes any qualities which that thing may share in common with any other thing.
But while none of these twenty or more definitions is logical in the sense just defined, they all present one or other of the differentiae given by those in the text.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "differentiae" in a variety of sentences. We hope that you will now be able to make sentences using this word.
