A System of Logic: Ratiocinative and Inductive, 7th Edition, Vol. I
CHAPTER VII. _Of the Nature of Classification, and
the Five Predicables._
§ 1. Classification, how connected with Naming 129
2. The Predicables, what 131
3. Genus and Species 131
4. Kinds have a real existence in nature 134
5. Differentia 139
6. Differentiæ for general purposes, and differentiæ for special or technical purposes 141
7. Proprium 144
8. Accidens 146