Includes a nice wind-up of part of the discussion of the absence of particular propositions. The reasons adduced for this omission by Ross (following along with the model of scientific practice) and Lukasiewicz (desire to get everything ready to work as both subject and predicate) don't cut it. Instead, the three classes of being given in I.27 are real types (particular, universal, categorical), and only the middle type fits the generalized program for discovering deductions presented in the following chapter, and serves the purpose of making this program possible.
Only half-way through chapter one, but at least I gather that an Aristotelian syllogism is a conditional proposition, rather than a valid generalized argument form. Can't say I see what's riding on that distinction yet.