Nothing immortal is a man,
Socrates is a man,
Therefore, Socrates is not immortal is only valid if the fourth proposition Therefore, no man is immortal is covertly thought. This unspoken proposition should be inserted after the first proposition and is merely its negative converse.
Section IV
In the so-called First Figure only Pure Ratiocinations are possible, in the remaining Figures only mixed Ratiocinations are possible.
Pattern of First Figure:
Subject...............Predicate
Middle Term........Major Term........Major Premise
Minor Term.........Middle Term........Minor Premise
Minor Term........Major Term...........Conclusion
A ratiocination is always in the first figure when it accords with the first rule of ratiocination: A predicate B of a predicate C of a subject A is a predicate of the subject A. This is a pure ratiocination. It has three propositions:
C has the predicate B,
A has the predicate C,
Therefore, A has the predicate B.
In the Second Figure only mixed Ratiocinations are possible.
Pattern of Second Figure:
Subject...............Predicate
Major Term........Middle Term........Major Premise
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