Solar heat, b. [145].
Solstitial points, a. [131].
Solution of water in air, b. [166].
Sothic period, a. [118].
Spagiric art, b. [262].
Specific heat, b. [159].
Sphere, a. [130].
Spontaneous generation, b. [457].
Statical electricity, b. [208].
Stationary periods, a. [48].