INDEX. 



Magnesium, 197, 379. 



Magnetic needle, variation of, 189. 



Magnetic needle influenced by aurora 

 borealis, 246. 



Magnetism, produced by friction, 394. 



. causes of, in the earth, 398. 



Mammoth, notice of, 388. 



Marble, regular impressions on, 361. 



Mastodon, near Rochester, 358. 



Mauch Chunk, geology of, 1. 



Mecanique Celeste, translation of, 202. 



Mercury, peroxide of, adulterated, 80. 



Metals, reduction of by azote, 371. 



Metallicity, determination of, 57. 



Meteoric iron of Bohemia, 385. 



Microscope, improvement in, 57. 



Milk tree, notice of, 370. 



Mines in the Hartz, 113. 



Mitchell, Prof, on the proximate causes 

 of storms, 248. 



Molecules, living, 393. 



Moll, Prof, experiments on electro-mag- 

 netism by, 329. 



Morphia, impurities in, 75. 



Mortality of infants, 192. 



Muriate of soda, decrepitation of, 198. 



o. 



Oil of Sweet Almonds, impurities in, 76. 



olives, impurities in, 76. 



Ricinus communis, impurities in, 



77. 



Oolite in situ, 398. 

 Optical Intsruments, 390. 

 Organism, living, 391. 



Penetrative ness of fluids, 360. 

 Pennsylvania, coal region of, 1. 

 Peruvian bark, adulteration of, 81. 

 PfafT, Prof., theory of voltaic electricity, 



178. 

 Phosphate of soda, impurities in, 82. 

 Phosphorus, preparation of, 382. 

 Phthisis pulmonalis in Paris, 193. 

 Pine timber, strength of, 228. 

 Plants, as affected by poisons, 172. 

 Populine,380. 

 Porter, Prof, notice of his edition of 



Gray's operative chemist, 362. 

 Potassium, preparation of, 205. 

 Prussic acid, impurities in, 70. 

 Pyrophorus, a new kind of, 173. 



R. 



Rensselaer school, notice of, 151. 



Roger, Theod., on preserving insects, 213. 



Roman aqueducts, 389. 



Rumford, Count, biographical memoir of, 



28. 



Ruschenberger, Dr., translation by, on 

 plants of Chile, 63, 299. 



S. 



St. Lawrence county, (N. Y.) mineralo- 

 gy of, 226. 



Salicine, 204, 370. 



Salina salt, 141. 



Salisbury iron works, 322. 



Salt formation, remarks upon, 141. 



Salts, fusibility of, 379. 



Sand, pressure of, 190. 



Seleniuret of palladium, 369. 



Shepard, C. U., on steel mine and iron 

 works in Connecticut, 311. 



Silk, culture of, 175. 



Silver paper, imitation of, 180. 



Silver works of the Hartz, 117. 



Small pox, virus of, 389. 



Smith, Dr., on fever, 363. 



Soda, impurities in, 83. 



bi-carbonate of, 148. 



muriate of, impurities in, 178. 



Solfaterra, connection of, with Vesuvius, 

 387. 



Sound, concentration of, 190. 



Spathic-iron ore in Connecticut, 311. 



Spruce timber, strength of, 228. 



Steam, elastic proof of, 181. 



the production of, at high tem- 



peratures, 292. 

 Steam boats, on the safety of, 143. 



boilers, 176, 202. 



Steel, American, 175. 

 Steel-ore mine, 311. 

 Steel by cementation, 182. 

 Steel, Dr., on swallows, 356. 

 Still, large one, 394. 

 Storms, proximate causes of, 248. 

 Strong, Prof., on central forces, 46. 

 Sulphate of magnesia, impurities in, 84. 

 quinine, impurities in, 84. 



Sulphuric acid, dilute, its action on zinc, 



372. 

 Surveyor's compass, improvements in, 



337. 

 Swallows, 172, 356. 



T. 



Tartrate of Potash and Antimony, impuri- 

 ties in, 86. 



Thomas, Edward, on improvements ia the 

 microscope, 57. 



