INDEX. 427 



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



the lobster, 203 

 Latitude, a direct method of computing, from true observations 



of the sun's altitude, and the time elapsed between them, 



172-176— remarks thereon, 370-372 

 Lead, analysis of the ferro-prussiate of, 210 — on the use of 



chromate of lead as a dye, 392 

 Levity, non-existent, in nature, 81 

 Leuthwaite, (Mr.), experiments of, for firing gunpowder by 



electricity, 391 

 Lime, on the solution of, 202 — analysis of the ferro prussicate 



of, 209, 210 — Carbonate of, deposited in wood,405, 406 

 Lithia, discovered in lepidolite, 202 

 Lithography, improvements in, 382 

 Longitude act, notice of, 411 

 Luminous marine animals, observations on 248-260 



M 



Mac Culloch, (Dr.) on the forms of mineralogical hammers, 

 1-10 — notice'of his geological classificationjof rocks, 216-218 

 — two new minerals discovered by him, 218-219 — remarks 

 on marine luminous animals, 248-260 — on the potash to be 

 obtained from potatoes, 382-384 — on the resemblance between 

 certain varieties of granite and trap, 404 

 Ma5r?«e<w»t impressed on metals by electricity in motion, 281-290 



— the force of compared with the dip, 374-378 

 Maize, analysis of, 206-208 

 Mammoth, account of the remains of one found near Rochester, 



20-26 

 Manganese, analysis of the oxides of, 201 

 Marine luminous animals, observations on, 248-260 

 May cock (Dt.) geological description of Barbadoes by, 10-20 

 Mechanical science, miscellaneous intelligence in, 199-220, 381- 



385 

 Melville Island, meteorological observations on, 222 

 Memes (J. L. Esq.), observations of, on the solar eclipse in 



September, 1820,26-39 

 Mercury, observations on the depression of, in glass tubes, 

 83-85 — chemical analysis of the hepatic mercurial ore, from 

 Idria, 273-276 

 Metals, essays on the calcination of, 79-83 

 Metesrological diary for March, April, and May, 1821, 413 

 Meteorological observations on Melville Island, 222 

 Minerological hammers, observations on the forms of, 1-10 

 Minerals, apparatus for showing the double refraction of, 199 



