INDEX. 115 



Lake, Superior, geography and geology of, xviii. 1, 228 



Lakes, temperature of, x. 198 



Lalagunilla (valley of), in South America, situation of, i. 188. 



Account of the soda-lake there, ib. The urao or soda, how 



extracted, 190. Its uses, 191 

 Lalande (M.), error in the logarithmic tables of, corrected, xviii. 



347 

 Lamarck's genera of shells, analysis of, xiv. 67, 298. xv. 23, 



216 

 . translated, xvi. 49, 241. Remarks on his system, 



258. Explanation of the plates illustrative of the genera of 



shells, 260 

 Lamb (M.) on the tenacity of iron, as applicable to chain- 

 bridges, XX. 162 

 Lambton (Lieut. -Col.), corrections by, applied to the great 



meridional arc, to reduce it to the parliamentary standard, xvi. 



328 

 Lameness, chronic, in horses, new mode of treating, iii. 873 

 Lamp, portable, for gas, described, viii. 234 



new, notice of, ix. 392. xv. 143 



improved, description of, x. 101 



of a new sinumbral one, xi. 290. Improvement of oil- 

 lamps, 381. Account of coal-oil parish lamps, 382. 



furnace, for the analysis of organic bodies, xvii. 232 



Lampates, account of various, vi. 321 



Lampic acid, preparation and properties of, vi. 318. Its com- 

 binations, 320. Analysis of it, 324 



Lampyrides, inquiry into the nature of the luminous power of 

 some, xvii. 267 



Lancasterian schools, progress of, in various parts of Europe, 

 ix. 212 



Landa, manufactures of, viii. 278 



Landriani (M.) on new and delicate thermometers, vii 183. 

 Principle of his self-registering thermometers, 186 



Land-slip, account of, xiv. 455 



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