INDEX. 



Air has weight, 262-264 — how to ascertain to what volume of 

 air a certain quantity of water is reduced, 265-267 — proof 

 that air is rendered heavy by the mixture of some matter 

 heavier than itself, 268 — and by the compression of its parts, 

 269-270 



Air-gun, notice of the first discovery of, 271 note 



Alcali, new vegetable, notice of, 204 



Alcohol, on the formation of, by fluoboric gas, 394-395. 



Altar (Roman), notice of, 41 1 



Alum, chemical analysis of, 342 



Alumina and potassa, analysis of the sub-sulphate of, 389 



Aluminite, component parts of, 342 



Aluminous soap prevents the ravages of moths, in woollen 

 cloths, 393 



Animals, observations on the secreting power of, 40-44 — and on 

 marine luminous animals, 248-260 



Apple-bread, notice of, 384 



Aragoand Fresnel (M. M,), improvement of, in the construction 

 of oil-lamps, 381 



Arsenious acid, tests for, 341 



Art, fragment of, discovered in Newfoundland, 223 



Atmospherical refraction, observations on, 353-370. 



Atropia, analysis of, 204 



B 



Balance, new one, described, 280 



Barhadoes, (Island) geological description of, 10-20 



Baryta, analysis of the ferro-prussiate of, 209 



Berard, (M.) observations of, on the ripening of fruit, 395-397 



Berzelius, (Professor), experiments of, on the composition of 



prussiates, 208-216 

 Biot, (M.), Memoir of, on the magnetism impressed on metals 



by electricity in motion, 281-290 

 Bohnenbergers electrometer, notice of, 208 

 JSooAs (Scientific), analyses of, 119, 337— select lists of, 225, 



412 — notices of new ones, in hand, 412 

 Boracic acid, singular property of, 403 

 Braconnot (M.), observations of, on the crystallization of sugar, 



397 



2 F 2 



