INDEX. 



35i 



Pendulum Clocks, 42, 217. 



Performance of Duty, 304. 



Peri, 60. 



Periodic Law [Mendelejeffj, 188. 



Perkin, W. H. [Chemist], Aniline 

 Dyes, 1 88 ; Magnetic Rotation 

 of Organic Substances, 188, 285. 



Permanency of Laws, 101, 102, 160, 

 165. 



Persecution, Religious, 302. 



Perthes, see Boucher de Perthes. 



Perversion of Moral Type, 305. 



Peter of Pisa, 47. 



Petit [Physicist], 233. 



Petrarca, 65, 66. 



Peurbach's Ephemerides, 54, 97. 



Pharmacy (Pharmaceutics), 38, 40, 

 44. 



Phases of Venus, 6. 



Phenomena, Atmospheric, 224. 

 Heat, 228. 



of Flames, 257. 



of Sound, 256. 



Philanthropy, Immense Expansion 

 of, due to Scientific and In- 

 dustrial Spirit, 306. 



Philanthropy the Feature of Re- 

 cent Times, 306. 



Philippe Augustus, 47 (note). 



Philologists, Discoveries of, see 

 Discoveries. 



Philology (Comparative), 151, 280, 

 281 ; Definition of, Appendix 

 AA. 



Phlogistic Theory, 173, 191. 



Phonograph, 263-4, 275, 286, 294. 



Phosphoroscope, 252. 



Phosphorus, 38. 



Photography, 182, 239, 258, 261, 

 275. 



Photometer, 226, 234, 242. 



Photometry, 142. 



of Stars, 34. 



Physical Geography, 167. 

 Laws, 273. 



Physicists, Discoveries of, see Dis- 

 coveries. 



Physics, 44, 61, 100, 215, 269, 272, 

 280, 281. 



Physics, Alhazen's, 35. 

 Corpuscular, 226. 

 Definition of, Appendix AA. 

 Solar and Stellar, 234. 

 Physico-Chemical Laws, 275. 

 Physiologists, Discoveries of, see 



Discoveries. 



Physiology, 22, 37, 41, 55, 57, 60, 

 62,96,98,123,272,283. 

 Comparative, 127. 

 Definition of, Appendix 

 AA. 



Physiological Chemistry, 177. 

 Piazzi [Astron.], 206. 

 Piccolomini, 62. 

 Pictet [Physicist], 256. 

 Piezometer, 232. 

 Pile, Electric, 225. 

 Piston, 219, 260. 

 Planetarium, 15, 193. 

 Plants, Medical, 39. 



Respiration of, 175. 

 Plastic Arts, 64. 

 Plater, 63, 97. 

 Plato and Aristotle brought to 



Italy, 93. 



Plato's Deductive Process of Re- 

 search, 9. 



" Republic," 14. 

 Playfair (John) [GeoL], 160. 

 Pleiades, 100. 

 Plenum (Universal), 255. 

 Plough (The), 293. 

 Plutonian Theory, 49, 160. 

 Poggendorff [Physicist], his Law, 



235- 



Poisson [Math.], 203. 

 Poland, 282. 

 Polar Clocks, 241. 

 Polarity of Gases, 242. 

 Polarisation of Light, 218, 230. 



Rotatory, 230. 

 Political Changes due to Science, 



300. 



Economy, 153-156, 283. 

 > in Antiquity, 1 7. 



Moral Benefits 



from, 299. 

 Porta (G. Delia), 57. 



