Spiritualism, II, [47], [55], [207].
Spurius Cassius Viscellinus, II, [342].
Spurius Maelius, II, [342].
Squaring the circle, I, 8, 42, 44, 46, 47, 50, 52, 53, 69, 70, 75, 109, 117, 119, 129, 135, 146, 149, 159, 163, 164, 347, 348, 374; II, [10], [11], [60], [105], [154], [156], [208], [278], [314].
Stäckel, I, 230.
Stanhope, P. D., (Earl of Chesterfield), II, [298].
Stapulensis, I, 44; II, [324].
Star polygons, I, 229.
Starkie, G., I, 126, 126.
Statter, D., II, [80].