A System of Logic: Ratiocinative and Inductive, 7th Edition, Vol. I
CHAPTER VI. _Of Propositions merely Verbal.
§ 1. Essential and Accidental propositions 119
2. All essential propositions are identical propositions 120
3. Individuals have no essences 124
4. Real propositions, how distinguished from verbal 126
5. Two modes of representing the import of a Real proposition 127