INDEX. 
ACID (new), produced by the distillation of citric acid, 422. 
Properties of the pyro-citric acid, 423—425. Its consti- 
tuent parts, 436. Experiments on the combination of acetic 
acid and alkohol, with the volatile oils, 425—427 
Aérolites (notices of), 448—450 
Africa (Western), account of a journey from Egypt to, 3—14 
Africa (Southern), observations on the climate of, 241—254 
Alkali, new test for, 445 : 
Alkohol, effect of voltaic electricity on, 232. On the combina- 
tion of it with volatile oils, 427 
Alloys of steel, experiments on, 377, 378 
Alum-crystals, method of colouring, 445, 446 
Alumina, on a peculiar sulphate of, 435 
Ammonia (bi-phosphate and bin-arseniate of. On the relation 
between the crystalline form and chemical proportions of, 
203, 204. And of the arseniate and phosphate of ammonia, 
204, 205 
Ampere (M.), new electro-magnetical experiments of, 441, 442 
Amulets, origin of, 360 
Annealing of cast-iron, importance of, 224 
Arragonite, new locality of, 236 
Arsenic, action of water on metallic, 233 
Astronomical Collections, 186—197, 402—415 
Atmosphere, on the finite extent of, 167 
Atlantic Ocean, meteorological observations and journal on a 
voyage across, 115—141 
Babbage (C. Esq.), on the application of machinery to the 
purpose of calculating and printing mathematical tables, 
222, 223 
Bell (Charles, Esq.), observations on the nerves of respiration, 
breathing, speaking, and expression, 381, 382 
Berthier (M.), researches of, on the uses of the sulphate of 
lead in the arts, 230, 231 
Berzelius (M.), experiments and observations on the chemical 
composition of the white efflorescing pyrites, 208. On the 
composition of the alkaline sulphurets, 209—216, 419, 420 
Bile, effects of, on the process of indigestion, 341—344 
