352 



INDEX. 



Portugal, 282. 

 Posidonius, 26. 

 Positive Philosophy, 42. 

 Potash Bulbs, 184. 

 Pottery (Glazed), 53. 

 Pouchet [Biol.], 29, 133. 

 Pouillet [Physicist], 238. 

 Practical Art, 64. 



and Artistic Skill, 69. 



Men and their Inventions, 

 260. 



Science, 98. 



Work, 270. 



Precession of the Equinoxes dis- 

 covered by Hipparchus, 25, 35, 



201. 



Preconceived Theories in Antiquity, 



16. 



Preface, v. 

 Pressure of Air, 192. 

 Prevost [Geol.], 164. 

 Priestley [Chemist], 37 ; Oxygen, 



174. 



Prime Movers, 264. 

 Primitive Forms of Life, 116-7, 

 126, 128, 130-133, I35 138-9, 

 147, 276. 



Prince Henry, the Navigator, 54. 

 "Principia," 136, 201. 

 Printing, 54, 92. 

 Prism, 192, 267 ; Nicol, 230. 

 Prismatic Colours, 218. 

 Probabilities, Calculus of, 193, 194. 



Theory of, 195. 



Problem of Dark Lines in Spec- 

 trum, 249. 



Progress among the Arabs, xiv., 28. 

 in Antiquity, xiii., 19. 

 in the Middle Ages and 

 during the Revival, xiv., 

 50. 



General, 282. 

 Material, 289. 

 Moral, 292. 

 Protyle, 187. 

 Prout's Theory, 189. 

 Pruner Bey [Anthropol.], 149. 

 Ptolemaic System, 19. 

 Ptolemies (The), 19. 



Ptolemy, 26. 

 Public Opinion, 300. 

 Puddling, 263. 

 Pulse, 21. 

 Pump, Air, 216, 219. 



Spiral, 22. 



Steam, 260. 



Suction, 54. 

 Pyramid, The Great, 6. 

 Pyrheliometer, 238. 

 Pyrometer, 220, 236. 

 Pythagoras, 8. 



QUADRANT (The), 15, 34. 

 Qualitative Analysis, 249. 

 Quantitative Analysis, 249. 

 Quaternions, System of, 196. 

 Quatrefages [Anthropol.], 1 50. 

 Quesnay [Sociol.], 153, 283. 



RADIANT Heat, 102, 239. 

 Matter, 261. 



Radiometer, 257. 



Railway Engine, 261. 

 Train, 274. 



Rainbow, 58, 59. 



Rankine, 244. 



Raphael, 64. 



Rapine, 298. 



Rashi, Dietetics and Remedies, 40,, 



Rawlinson [Philol], 152. 



Ray [Botanist], 113. 



Rays, Heat and Dark, Chemical, 

 206. 



Rdaumur [Biol.], 127 ; as a Physi- 

 cist, 127, 220. 



Refraction, 35, 37, 60, 98. 

 Double, 217. 

 Laws of, 60, 192. 



Regiomontanus, 55. 



Regnault [Physicist], 234, 241, 243. 



Reign of Terror, 302. 



Reiss, 264. 



Religion and Religious Govern- 

 ment, 301-2. 



Religious Government more Hu- 

 mane through Science, 302-3. 



Remarks (General) on Biol., 158;; 



