486 



INDEX 



Space, not so empty as was sup- 

 posed, 395 



Spacing of the planets, Bode's law, 

 306 



Spectroscope, revelations of, 345 



Spectroscopic binaries, discovery of, 



374 



Spectrum, named by Newton, 345 

 Speed of the sun's translatory 



motion, 323 

 Spencer, his doctrine compared to 



that of Democritus, 140 

 on registered experience, 9 

 value of his philosophy, 1 5 

 Sphericity of the earth, early argu- 

 ments for, 63 

 Spinoza, Bruno his godfather, 



182 



Spiral nebulae, Lord Rosse's ob- 

 servations, 420 



Spores, size and nature of, 437 

 Stability, of binary systems, 377 



of the solar system, 293, 446 

 Stadia, varying lengths of, 77 

 Stadium, unit of distance, 54 

 Star gauging, Herschel's method of, 



389 



history, three stages of, 424 

 light, 1'Hermite's calculation of, 



361 



streams, Proctor on, 392 

 Starry universe, extent of, 361 

 Stars, average distance of first 



magnitude, 360 

 nearest, their distance, 29 

 outside limit of number, 359 

 radial velocity of, 349 

 spectrum characteristics of, 349 

 speed of the, 340 

 Stellar system, possible loss of stars 



from, 447 

 Stoney, on number of dark stars, 



382 



Strabp, prediction of a new con- 

 tinent, 78 

 ridicules Eratosthenes' ideas his 



notions of gravity, 121 

 Structure of the heavens, a work by 



Herschel, 406 

 of the universe, theories of, 



385 

 Struve, on cosmic structure, 391 



parallax of Vega, 335 

 Sun, absolute distance of, 231 

 age of, 418 

 calculations as to visual diameter 



of, 147 

 comparative grandeur of, 337 



Sun, evidently distant and large, 67 

 first measure of its distance, 89 

 fixity of, first imagined, 104 

 its position in space, 362 

 its shifting position, 65 

 Kepler likens to a great magnet, 



190 



mediocrity of our, 339 

 movement of translation, 320 

 origin of its heat, 416 

 spectrum of, 347 

 volume of the, 234 



Sunlight, pressure of, 433 

 rays of, parallel, 59 



Suns, collision of, is incessant, 

 378 



Sun's motion in space, path of the, 



323 

 Sun-spots, Galileo's demonstration 



of, 204 

 Super-men, Democritus' idea of, 



141 



Swift, fanciful tale, 40 

 System of the universe, Lambert's, 



387 



solar, how it would look from the 

 outside, 27 



TAINE, on English slaves, 12 

 on truth, 188 



Telescope, first described by Roger 

 Bacon history of its discovery, 

 200 



penetration of Herschel's great 

 reflecting, 359 



Telescopes, colossal, of Auzout and 

 others accuracy of modern, 

 281 . 



Tennyson, quotation from In Mcmo- 

 riam, 25, 428 



Tetrad, grand, 52 



Thales, measure of the Great Pyra- 

 mid, 55 

 quotations from, 84 



Theophilus, Bishop, destroys Alex- 

 andrian Library, 153 



Theory of the Earth, a work by 

 Buffon, 402 



Thermo-dynamics, founded by Car- 

 not, 415 



Thermoscope, Galileo's invention, 



243 

 Thompson, Benjamin (see Count 



Rumford), 415 

 Thomson, J. J., on constitution of 



matter, 396 

 Thomson, Sir Win. (see Lord 



Kelvin), 418 



