INDEX. 55 



C5oppei', new test for, ix. 408. x. 182 



plate engraving, extraordinary improvement in, ix. 391. 



— — ores from Siberia, chemical analysis of, xi. 274-278. 



Analysis of the copper glance of Rothenburg, 279. On the 



granulation of, 386 

 analysis of a ferro- arsenical sulphuret of, from Freiberg, 



xii. 30-32. Of an antimonial sulphuret of copper from Kap- 

 nik, 32-34, 258. Of a cupreous sulphuret of lead and anti- 

 mony, from Clausthal in the Hartz, 34-36. Of the sulphuret of 

 copper and bismuth, 36. Effects of copper on vegetation, 178. 

 Pyrites, 330. Account of the native mines on Lake Superior, 

 422 



oxide of, dissolved in ammonia, xiii. 226. Component 



parts of the deutoxide of, 428. Analysis of yellow copper 



ore, 434 



experiment on the sulphuret of, xv. 1 50. Process of 



refining or toughening it, 156. Action of ammoniacal gas on, 

 157 



experiments on the acetates of, xvii. 383. Sheathing 



of ships, how prevented from corrosion, 253 



plates of, suggestion for the preservation of, xviii. 167. 



— ^— ' influence of, on magnetic needles, xix. 147. Massive, 



obtained by the moist process, 154. Ammoniacal chromate of, 



155 

 — observations on the changes which have taken place in 



some ancient alloys of, xx. 296 

 Copying machine, substitute for, viii. 346 

 Coral formation of rocks, geological remarks on, xiv. 283-295 

 CoRDiER (M.), on the composition of volcanic rocks, ii. 434 

 — — .-^— on the systematic arrangement of volcanic masses, iii. 



201-207 

 Cordilleras, on the hot spring of, xvii. 143. Account of the dif- 

 ferent masses of iron, which have been found in the eastern 



Cordillera of the Andes, 394 



(musty), simple process for purifying, v. pre/, vii. 



may be beneficially reaped before it is perfectly ripe, x, 447 



