INDEX. 493 



Phosphorus t on the preparation of, 181. 



Place, observations on the changes of, in the heavenly bodies, 

 9-25. 



Plantain Root, a febrifuge, 195. 



Plants, geography of, defined, 239 — history of, what, ibid. 240 

 — on the number of known plants, and their distribution in 

 different parts of the world, 240, 241 — their geographical 

 distribution, 241-254 — their social and solitary appearance, 

 254 — whether and in what degree the new and old worlds 

 possess the same plants, 255 — comparative view of the tem- 

 perature of both great continents, 256-261 — Influence of 

 different altitudes upon the vegetation of plants in the dif- 

 ferent zones of the earth, 262-266 — determination of those 

 relations of climate, which are most favourable to any of the 

 more common cultivated plants, 266 — singular instance of 

 their vitality, 468, 469. 



Platinum, sulphate of, a test for detecting gelatine, 454. 



Pococke, (Dr.) Efforts of to decipher the inscription on the 

 column at Alexandria, 1, 2. — copy of it, as deciphered by 

 him, 7. 



Poisons, (vegetable) remedy for, 192, 193 — of tlie viper, experi- 

 ments on, 193, 194. 



Pompeii, notice of excavations at, 202. 



Pompey's Pillar, the column so called, erected in honour of the 

 emperor Dioclesian, 6. 



Population of Paris, 202 — of Sweden, ibid — of Glasgow, ibid^^ 

 of America, 203. 



Potash, action of, on the chloride and oxide of gold, 119-121 — 

 muriate of, found in salt, 181, 182 — analysis of the chromate 

 of, 453. 



Potato, observations on the native country of, 25, 27, 470 — the 

 growth of potatoes promoted by using salt as a manure, 57, 

 58 — cantharadin found in the polato-fly, 457. 



Prize questions, in optics and mathematics, by the Royal Aca- 

 demy of Sciences of Prussia, 168, 450 — in medicine, by the 

 Societe de Medecine, and the Academy of Sciences at Paris, 

 195, 465, and by the Society of Sciences at Copenhagen, 196 

 — in agriculture and the arts, by the Haerlem Philosophical 

 Society, 445, 446 — chemical prize-questions by the same 

 society, 466-468 — in eloquence, by the French Academy, 474. 



Prussic acid, see Hi/droci/anic Acid. 



Publications, select'lists of, 208-214, 478-483. 



Pyroligneous acid, antiseptic power of, 173-175 — purification 

 of, 175.- 



Rainbow, observations on, 19. 



Rail, botanical discoveries of, 54. 



Reaping of corn, before it is perfectly ripe, benefit o^, 447. 



Rtd snow, early appearance of, 199 — experiments on, 395, 396. 



