INDEX. 
425 
M 
Mackenzie, Sir George, on the vision of the humble and honey bee, 67. 
Macnah, Mr W. on a suspended plant of Ficus Australis, 77* 
Magnetic equator, on the position of the, 401. 
Mag?ietism of the earth, account of the, 124. 
Mairan on mean temperatures, 78. 
Mallivnlly, account of the strata at the diamond mines of, 72. 
Ma?idingoes, account of the, IO9. 
Map of" the route between Tartary and Amarapura, account of the, 32. 
Mayer's formula for mean temperatures, 11, note. 
Maxwell, Mr, on the identity of the Congo and the Niger, 182, 205. 
Muynmba tongues, specimens of, 215. 
Meteoric Iron, method of imitating, 405. 
Meteoric Stones, 197* 
Meteofic Stmies in the form of leaves, 402. — height of meteors from 
which they fall, 403. — Their characteristic ingredient, 406. 
Mica, on the dichroism of, 244. 
Micrometer, prismatic, on a new one, 1 90* 
Microscopes, single, account of new ones, 74. 
Mineralogy, account of Professor Mohs’ system of, 154, 217. 
Mines in America, on the temperature of, 286. 
Mirage, on a case of lateral, 400. 
Mohs, Professor on a new system of crystallography and minera- 
logy, 154, 3 17. 
Morosi, M. on jets of water for driving water-wheels, 194. 
Morphia, analyis of, 200. 
Mosaic-work, account of the colours used in, 419- 
Mosotti on the figure of the sun, 400. 
Mountains, on the distant visibility of, 1 92. 
Mtiriate of gold and soda, analysis of, 314. 
of potash found in rock-salt, 407. 
Musket, Mr D. on iron-ores, 23. 
Musical Instrument, account of a new one, 194. 
N 
Nairne, Mr Edward, his process of artificial drying and freezing by 
the air-pump, 56. 
Needle, on the dip of the, 401. 
— on the retrograde variation of the, I79. 
on the variation of at Spitzbergen, 196. 
Newton, Sir Isaac, on the family of, 293. 
Nickel, sulphate of, 314.— Carbonate of, 31 9. 
Niger, on the identity of with the Congo, 104, 205. 
North Sea, on the bed of, 42. 
O 
Observatory of Gottingen, account of the, 396. 
Octahedral iron-ore, analysis of, 313. 
Oily substances, observations on, 302. 
