354 



INDEX. 



Screw of Archimedes, 23. 

 Screws, 262. 

 Scrope [Geol], 165. 

 Sedgwick [Geol.], 164. 

 Seebeck [Physicist], 237. 

 Seguin, 261, 283. 

 Selection, Natural, 283. 

 Semaphoric Telegraph of the Arabs, 



42. 



Seneca, 26. 

 Senefelder, 261. 

 Sense of Justice, Revived, 303 ; of 



Right, Revived, 304. 

 Serapion (The), 27. 

 Serres [Physiol.], 127. 

 Servetus, 62, 97, 283. 

 Seventeenth Century, Character of, 



271. 



Signals, System of, 254. 

 Signs in Pure Geometry, 196. 

 Silbermann [Physicist], 234, 242. 

 Simpson [Physiol.], 127. 

 Singing Flames, 256. 

 Sinus, Hyperbolical, 194. 

 Sismondi, 29. 



Sixteenth Century, Character of, 269. 

 Sky, Colour of, 257. 

 Slavery a Drawback to Science in 



Antiquity, 15, 298. 

 Small-pox, 39. 

 Smith, Adam [Sociol.], 154, 283. 



W. [Geol.], 138, 162. 

 Snell, 60, 96. 

 Soap, 41. 

 Social Changes due to Industry, 



248-9. 



Intercourse, 18. 

 Order, 298. 

 Societies, Learned, 64. 

 Sociologists, Discoveries of, 153. 

 Sociology, 153; Definition of, Ap- 

 pendix AA, 280, 281. 

 Solar Energy, 246 ; Duration of, 

 247. 



Heat, 239. 



Light, 257. 



Physics, 234. 



System, Heliocentric Doc- 

 trine, 23, 26. 



Solstices, 5. 

 Sosigenes, 26. 



Sound, 102, 210; Velocity of, 245 

 (note) ; Decomposition of, 246 ; 

 Phenomena of, 256, 275. 

 Spain, the Centre of Arabian Learn- 

 ing, 44. 



Spallanzani [Physiol.], 126. 

 Specific Gravity, 23, 59. 



Heat of Gases, 228. 

 Spectacles, 53. 

 Spectra of Stars, 235. 

 Spectral Lines, 262. 

 Spectroscope, 210, 233, 241-2, 



247-8,251,263. 



Spectroscopic Observations, 213. 

 Spectrum, 218 ; Analysis, 210. 



(Dark Lines of), Ex- 

 plained, 249. 

 Microscope, 257. 

 ,, Solar, 206 ; Dark Lines, 



233-234. 



Spencer (Herbert) on Common 

 Knowledge and 

 Science, 3. 

 his Genesis of Science, 



27 (note). 

 on Concrete and Abstract 



Knowledge, 3. 



on Evolution, 157, 283. 

 on Science, 109. 

 on Utility, 3. 

 Spencer's Classification of the 



Sciences, 112, 138, 141-2. 

 Sphere (The), 22 . 

 Spiral Spring (of Watches), 218. 

 Spirit of Free Inquiry, 269. 



of True Humanity, 307. 

 Sponges, 147. 

 Sprengel [Botanist], 116. 

 Square (Least) of Errors, 195. 

 Stahl [Chemist], Phlogistic Theory, 



173, 181. 



Stained Glass, 53. 

 Stancari [Physicist], 220, 227. 

 Stars, Fixed, 24, 27 ; Photometry 

 of, 34 ; Parallax of, 199 ; Double, 

 204, 209 ; Treble, 209 ; Multiple, 

 234- 



