116 INDEX. 



Langier (M.), analysis of a meteoric stone by, xiii. 420 



Languedoc, mines of, xviii. 128 



Lapidaries' \xhee\ for cutting stones in the East Indies, account 



of, xviii. 380 

 Lapis Li/dim^ or touchstone, analytical examination of, xv^. 



315 

 La Place (the Comte) on the application of the calculation of 



probabilities to natural philosophy, i. 120 

 • on the length of the seconds' pendulum, iii. 158. No- 

 tice of the supplement to his analytical theory of probabilities, 



181 

 ■ latest computation of the density and figure of the 



earth, ix. 32 

 system of astronomy, remarks on, xiv. 410. Addition 



of, to a memoir on the theory of elastic fluids, 430 

 Larch-tree, use of, in tanning, xii. 40S 

 Larvce, tenacity of life in, xx. 189 

 Lassaigne (M.), experiments of, on the colouring matter of the 



lobster, xi. 203 

 on a new acid, produced by the distillation of citric 



acid, xiv. 422, 435 



— — experiments of, on the compounds of nickel, xv. 151 



on the purpuric acid, xvi. 104. On the existence of a 



carbonate of magnesia in the urinary calculi of herbivorous 



animals, 109. On the compounds of cystic oxide, 176 

 — .— on the preparation of the oxides of nickel, xvii. 140. 



On the detection of acetate of morphia in poisoning, 168 

 Latitude, a direct method of computing, from two observations of 



the sun's altitude, and the time elapsed between them. xi. 172. 



Remarks thereon, 370. xii. 389 

 • easy approximation to the diiference of, on a spheroid, 



xvii. 316 

 at sea, method of finding, by the altitude of two fixed 



stars when on the same vertical, xviii. 99 



of Greenwich, as computed by Professor Bessel, xx. 93 



