INDEX. 



427 



Phosphorus in nature, 254. 



Phosphorus, oxides of, 257. 



Phosphorus, preparation of, from 

 bones, 2u3. 



Phosphorus, properties of, 249. 



Photography, principles of, 395. 



Physics, or Natural Philosophy, 1. 



Plants, action of lime in cultivation 

 of, 503. 



Plants, annual changes in, 485. 



Plants, ashes of, 482. 



Plants, food of, 481. 



Plants growing without earth, 476. 



Plants, mineral classification of, 483. 



Plants, silica in, 2GO. 



Plants, soil the food of, 486. 



Plants, source of carbon in, 474. 



Plants, water in, 484. 



Plaster casts, 320. 



Platinum, 384. 



Plumbago, 99. 



Potash, preparation of, 287. 



Potassium, 282. 



Potassium and water, action of, 285. 



Potassium carbonate, 288. 



Potassium hydrate, 286. 



Potassium hydrate, action of chlorine 

 on, 226. 



Potassium hydro-carbonate, 290. 



Potassium nitrate, 291. 



Potassium permanganate, 335. 



Potassium, preparation of, 283. 



Potassium, properties of, 284. 



Pottery, 267. 



Priestley's discovery of oxygen, 48. 



"Prince Rupert's drops," 264. 



Protein substances, 470. 



Providence balancing the atmos- 

 phere, 131. 



Proximate analysis, 427. 



Puddling iron, 342. 



Q. 



Quartz, composition of, 259. 

 Quicklime, 311. 



Quicklime and water, 312. 

 Quinine, 531. 



R. 



Radical, definition of, 164. 



Rat-poison, 249. 



Reciprocal proportions, law of, 31. 



Red fire, 308. 



Resins, 527. 



Resins, uses of, 528. 



Rochelle salt, 508. 



Rocks; changes in, 13. 



Rotten wood, 446. 



Ruby, Oriental, 326. 



S. 



Sal volatile, 307. 



Saleratus, 290. 



Salt cake, 301. 



Salt, common, 296. 



Salt, decomposition of, 297. 



Salt in the animal economy, 580. 



Salt, localities of common, 298. 



Saltpetre, 291. 



Salts, 80. 



Salt-works, 299. 



Scheele, 17. 



Scheele's green, 361. 



Sea, salt in the, 300. 



Sea- water, lime in, 318. 



Seed, growth of, 471. 



Sesquioxide, 62. 



Sewer-water, value of, 507. 



Silica, abundance of, 259. 



Silicified wood, 261. 



Silicon, 258. 



Silver, 378. 



Silver, nitrate of, 380. 



Silver, salts of, 380. 



Size of molecules, 20. 



Slag, 265. 



Slaked lime, 3 10, 3 12. 



Slit of spectroscope, use of, 400. 



Smalt, 348. 



Snow, experiment with, 135. 



