INDEX. 425 



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

 bridges, 162, 163 

 Larvce, tenacity of life in, 169 



Latitude of Greenwich, as computed by Professor Bessel, 98-100 

 Lead plaster, water essential to its formation, 400, 40 1 

 Leaden pipes, strength of, 375, 376 

 Lectures on chemistry, at the Royal Institution, prospectus and 



plan of, 203 

 Life, tenacity of, in larvae, 169 

 Lignites, remarks and observations on, 205-231 

 Light of haloes, polarized state of, 167-168 

 Light houses, suggested improvements in, 376, 377 

 Lightning, length of the electric flash producing, 172 

 Lightning, its effects on the animal system, 404 

 Lime, action of, on alcohol, 180, 181 



, phosphate of, process for detecting, 175, 176 



water a test for arsenic, 398, 399 



Logarithms, errors in the best tables of, 312-314 

 Lunar distances, observations on the method of computing the 

 true from the apparent, 315-321 



Mac Culloch, (Dr. J.) observations on the means by which crabs 

 throw off their claws, 1-11 ; on a peculiar appearance of hoar- 

 frost, 40-44 ; observations on the lignites, 205-231 



Magnetic needle, deflection of, by the electric current, 400 



M'-Kcever, (Dr. T.) on the influence of solar light on the process 

 of combustion, 3S7-3SS 



Manufacture of Etruscan vases, observations on, 163, 164 



Marble, (flexible) notice of, 1 85 



Marshes, insalubrity of the air of, bordering upon the sea, 401- 

 403 



Melania. See Sepia. 



Melida, remarkable phenomena, observed in the island of, 417, 

 418 



Memory, loss of, notice of, 40S, 409 



Metals, preservation of, by electro-chemical means, 343-348 



Meteoric appearance of Ben Lomond, 1S2, 183 



Meteoric-stone, fall of one, notice of, 184, 135 



Meteorological essays, correction of an error in, 74 -7S; diary, 

 202, 420 



Microscope, notice of a new one, 377, 37S 



Minerals extraordinary, discovered at Warwick, Orange county 

 N. Y., 186, 1S7 



Mineral substance, on the existence of iodine in a, 173, 174 



Mineral waters, analysis of two, from springs in Windsor Great 

 Park, 264-266 



Mole-aickct, on the anatomy of, 329-334 



Morphia, meconiate of, simple mode of procuring, 399, 400 



