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Acetic acid, acidiraetry of, 30. Acetylamine, researches on, 303 ; de rivatives of, 306. Acetyle compounds, 78. Acid vapours escaping from chimneys of chemical factories, process for arrest ing, 54. Acids, behaviour of some, in the animal organism, 161. Acryl-oxamethane, 158. Acrylic alcohol, 156. jEthal, observations on, 221. zEther, oxidizing properties of perchlori- nated, 16. ^Etherification, on the theory of, 208. iEthylamine, compounds of, 206; new mode of formation of, 387. iEthylonaphthylamine, 332. Albumen, preparation of, for technical purposes, 390. Alcohol, on a combination of, with ba ryta, 227, Alcohols, on a new class of, 156. Alkalies and alkaline earths, improve ments in the manufacture of, 359. Alkaloids, tests for various, 229,251, 394. AUoxanic acid, 73. Alloys, for type metal, 219; of lead and iron, 434 j of aluminium, 453, 462. Allyle, and allylic compounds, 171. Alum, on the detection of small quanti ties of, in red wines, 136. Alumina, separation of, from oxide of iron, 206. Aluminium, on the manufacture of, 32, 338; manufacture of, from cryolite, 381 ; alloys of, 453, 462 ; preparation and properties of fluorid" of, 101. Amides, action of sulphuric acid on the, 58, 395. Ammonia, separation of, from a'thvl- amine, 206 ; volumetric determination of, 406; new reaction for, 463; beha viour of iodide of mercury to, 445, 463. Ammonium theory, observations on the, 307. Anilotic acid, preparation and composi tion of, 169. Animal organism, on the behaviour of some acids in the, 161. Anisoic acid and salts, 167. Anisylic alcohol, 368. Antimony, equivalent of, 163, 310; on the precipitation of the protochloride of, by water, 242; methods of assaying for, 353. Arachic acid and salts, 181. Arachine, preparation and properties of, 184. Argentiferous minerals, on the treatment of, 274. Arppe, A. E., on the action of sulphuret of ammonium upon paranitraniline, 50; on the anilide compounds of malic acid, 64. Arsenic acid, preparation and properties of, 248 ; use of, in calico-printing, 250 ; determination of, in east iron, 260; se paration of, from nickel and cobalt, 27 7. Arsenious acid, deposition of, in com mercial oil of vitriol, 75. Arsine, 41. Atropine, test for, 252. Babo, M. von, on the production of fluor escence by the flame of sulphuretted hydrogen, 243. Baker, \V., on the purification of lead by crystallization, 372. Balmain, \V. H., on the recovery of oxide of manganese, 79. Barium, chlorobicadmiate of, 1; cadmio- iodide of, 123 ; iodide of, 126. Baryta, solubility of the sulphate of, 55 ; on a compound of, with alcohol, 227. Baudrimont, E., on soft sulphur, 206; on the precipitation of protocbloride of antimony by water, 242. Bechamp, A., on pyroxvline, 12 ; on the preparation of the chlorides and bro mides of the organic radicals, 164 ; on the albuminoid substances, and their conversion into urea, 402. Beckmann, F., on hordeic acid, 14. Benzamic acid, preparation of, 330. Benzoic acid, preparation of pure, 327. Benzoyle, sulphocyanide of, 351. Bergstrand, C. E., on furfurine, 151.