462 INDEX. 
tions on the deleterious eftects of, 352. On the relation be- 
tween the crystalline form and chemical proportions of the 
neutral arseniate and phosphate of lead, 416, 417 
Leslie (John, esq.) analysis of his treatise on meteorology, with 
remarks, 172—-185 
Lightning, electro-magnetic effect of, 442 
Lignite, beds of, discovered in Russia, 235 
Limestone, magnesian, of England, remarks on, 153. Old red 
limestone, 153 
Limewater, a cure for ringworm, 238 
Literature of ancient Egypt, notice of discoveries in, 255— 
261 
Lithographic Press, notice of a new one, 432 
London clay, geological remarks on, 144. History of the wells 
in London, 145, 146 
Lowry (Miss) conversations on mineralogy, analysis of, 154. 
Remarks on some of her definitions, 155, 156. Plan of her 
work, 157,158. Specimen of it, 158, 159. Some etymo- 
logical errors corrected, 160. General character of the work, 
160 
Mac Culloch (Dr.) conjectures on the Greek fire of the 
middle ages, 22—40. Observations on certain elevations of 
land connected with the actions of voleanoes, 262—295 
Machinery, application of, to the calculation and printing of 
mathematical tables, 222, 223 
Magnesia, test for, 229 
Magnetic Needle, notice of experiments to determine the dip of, 
161. Retrograde movement of the magnetic needle, 220 
Magnets (artificial) on the fabrication of, 220 
Magretism, by percussion, in steel and iron, experiments and 
observations on, 376, 377 
Mallow, flowers of, a test for alkali, 445 
Marcet (Dr.) experiments on the saline contents of sea water, 
388 
Materia Medica, sketch of the history of, 359—363 
Measurements (astronomical) of the ancients, remarks on, 190, 
191 
Mechanical Science, miscellaneous intelligence in, 220—226, 
430—433 
Mechanism of the spine, remarks on, 380 
Mercury, on the congelation of, 441 
Meteors, remarks on the nature of, 447, 448 
Meteorology, notice of various experiments on, 173, 174. Stric- 
tures on Mr. Leslie’s treatise on this subject, 175—185 
Meteorological Diary, kept at Earl Spencer’s seat, at Althorp, 
for June, July, and August, 239. For September, October, 
and November, 456 
i 
