Sophisma polyzeteseos, [372] n.

Sorites, [370]–6.

Spalding, W., [133] n. ; [201] n. ; [321] n. ; [349]; [387]; [445].

Spencer, H., [378] n.

Square of Opposition, [110].

Strengthened Syllogism, [314], 15.

Studies in Logic by Members of the Johns Hopkins University, [323] n. ; [510] n. ; [517]–20.

Subaltern Moods, [313], 14.

Subaltern Opposition, [110]; [117], 18; how affected by the existential import of propositions, [227]–31.

Subalternant and Subalternate, Propositions, [110].