Accidental Proposition, [49].

Acquired Perceptions, [414].

Added Determinants, Immediate Inference by, [148], 9.

Addition, sign of, in symbolic logic, [468] n.

Aequipollence, [133] n.

Affirmative Proposition, [92].

Aldrich, [109] n. ; [322] n.

All, as a sign of quantity, [97]–100.

Alternant, [277]; [468]; [479].

Alternative Combination of Terms, [468], 9; of Propositions, [479].