Part 36

Seas, lunar (q. v.), 143.

Secchi, Father, 14, 15, 24, 25, 29, 30, 43, 59, 235.

Segmentations, 30, 31.

Self-luminosity, 215.

Sextant, 224.

Shadows. (See Lunar.)

Shakspeare, quoted, 60, 220.

Sheaves, 68.

Shelbyville, 42, 43.

Sherman, observations at, 88.

Ship, comparison, 133. (See Steamer.)

Shooting-stars, 35, 193, 196, 198, 199. (See Falling, Meteors.)

Sicily, 50. (See Etna.)

Siemens, Sir William, 111.

Sierra Nevada, 151, 160, 180.

Signal Service, 90.

Silicon, 107.

Sirius, 179, 222–224, 236–238.

Slits, 59, 63, 64.

Smoked Glass, 11.

Snow-flakes, 19, 35.

Snow-like Forms, 25.

Sodium, 237.

Solar Engine, 75, 109.

Solar Light (q. v.), 13.

Solar Physics, 4, 12, 14. (See Sun.)

Solar System, 228, 229.

South America (q. v.), 80.