404 INDEX. 
254, 255. Combustion of, by sulphur, 381. Ammonia found 
in the oxides of iron, ibid. On the different masses of iron 
found in the eastern Cordillera of the Andes, 394, 395 
Tron-wire suspension bridges, remarks on, 147, Expense of the 
bridge at Geneva, 148 
Irritability of plants, 176 
Jalap, a new vegetable principle discovered in, 38600 
Just (Dr.) results of the experiments of, on fulminating silver and 
mercury, 153—157 
Kermes mineral, preparation of, 165 
Lamp-furnace for the analysis of organic bodies, 232—235 
Lampyrides, inquiry into the nature of the luminous power of 
some, 269, 270 
Larva, account of an undescribed species of, 176—178 
Lassigne (M.) experiments of, on the oxides of nickel, 140. On 
the detection of the acetate of morphia, in poisoning, 168—170 
Latitude, easy approximation to the difference of, on a spheroid, 
316, 317 
Lecanu and Serbal, (MM.), on the preparation of oxide of uranium, 
139. Collection of facts by, on the history of the succiniic and 
benzoic acids, 14] v 
Leeson (Mr. H. B.), description of a self-acting blow-pipe, 236 
Leghorn straw-plat, premiums for, 153 
Leyden Jar, improvement in the construction of, 162 
Liebeg (Dr.) experiments of, on fulminating silver and mercury, 
153—157 ; and on fulminic acid and fulminates, 386—390 
Limestone, experiments on the burning of, 361—363 
London, observations on the climate of, 340—345. Table of the 
level in, above the highest water mark, 361 
Longitude of Madeira and Falmouth determined, 270, 271 
Mac Culloch (Dr.,) hints by, on the possibility of changing the re- 
sidence of certain fishes from salt-water to fresh, 209—231 
Magendie (M.) on some recent discoveries relative to the nervous 
system, 143, 144, 
Magnetism, on the apparent, of metallic titanium, 129. Supposed 
effect of magnetism on crystallization, 158. On thermo-mag- 
netism, 158—160. Influence of magnetism on chronometers, 197 
—202, and 365—367. Experimental inquiries relative to the 
distribution and changes of the magnetic intensity in ships of 
war, 261, 262. New phenomena caused by the effects of mag- 
netic influence, 276. Memoir on the theory of magnetism, 
317—334. 
Mechanical Science, Miscellaneous Intelligence in, 147—153, 
360—369 
Meconic Acid, action of, on the animal economy, 393, 394 
Melania Setosa, a new species of fresh-water shell, description of, 
13—15 ; 
