434 



London in 1821, ii. 155, in 1B28, 

 ii. 357; annual decrease of the dip 

 in London diminishing, ii. 358. 

 Magnetism: magnetical pyrites, ana- 

 lysis of, j. 155; magnetic attraction 

 of oxides of iron, i. 204 ; magnetic 

 phenomena produced by electricity, 

 ii. 136, 154; magnetic action, ano- 

 malous, of hot iron between the 

 white and blood-red heat, ii. 164; 

 on the developement of magnetical 

 properties in steel and iron by per- 

 cussion, ii. 168, 210; magnetic in- 

 tensity, on the diurnal changes of in 

 the dipping and horizontal needles, 

 ii. 197, 293, 344; apparent magne- 

 tism of metallic titanium, ii. 199 ; 

 magnetic forces, on the effects of 

 temperature on the intensity of, ii. 

 225 ; magnetism of iron and other 

 substances during rotation, ii. 241, 

 243, 249, 251 ; magnetizing power 

 of the more refrangible solar rays, 

 ii. 263; magnetic influence in the 

 solar rays, on, ii. 270, 351; magne- 

 tic needle, observations for deter- 

 mining the dip of, ii. 293 ; magnetic 

 and electrical rotations, ii. 287, 295, 

 305; magnetic bodies, on the mutual 

 action of the particles of, ii. 305. 



Malformation in the heart of an in- 

 fant, i. 195. 



Malic acid, observations on, ii. 22. 



Manatee, on the peculiarities that dis- 

 tinguish it from the dugong, ii. 152. 



Manning (Thos.), methodof computing 

 logarithms, i. 239. 



Mantell (G.) on the iguanodon, a 

 newly discovered fossil reptile, ii. 

 234. 



Marcet (Dr. A.), analysis of the waters 

 of the Dead Sea and the river Jor- 

 dan, i. 275 ; on the non-existence of 

 sugar in the blood of persons labour- 

 ing under diabetes mellitus, i. 391 ; 

 on the alcohol of sulphur, or sulphu- 

 ret of carbon, i. 465 ; on the pro- 

 duction of cold by the evaporation of 

 the sulphuret of carbon, i. 473 ; on 

 the specific gravity and temperature 

 of sea-waters, and account of their 

 saline contents, ii. Ill, 178. 



Martin (E.), description of the mineral 

 basin, South Wales, i. 240. 



Maskelyne (Dr.) on a new property 

 of the tansrents of three arches tri- 



secting the circumference of a circle, 

 i. 293. 



Maskelyne (Dr.), formula? for finding 

 the longitude and latitude of a celcs- 

 tialobject from its right ascension and 

 declination ; and for finding its right 

 ascension and declination from its 

 longitude and latitude, demonstra- 

 tions of, ii. 38. 



Masulipatam, longitude of, ii. 177. 



Matter, expectorated, on, i. 339. 



Meadow saffron, the can medicinale of 

 Husson, a vinous infusion of the, ii. 

 41. 



Measure, linear, comparison of various 

 British standards of, ii. 139, 150; on 

 the error in standards of, ii. 409. 



Measures and weights, account of the 

 construction of the new standards 

 of, ii. 254. 



Mechanics, suggestion of a new term 

 in, ii. 299. 



Mediterranean, on the water of the, ii. 

 355. 



Medulla spinalis, on a canal in that of 

 quadrupeds, i. 325. 



Megalosaurus, fossil, in the sandstone 

 of Tilgate forest, ii. 234. 



Membrane, on the component parts of, 

 ii. 25. 



Mendoza (J. de) on an improved re- 

 flecting circle, i. 56. 



Mercurial vapours, account of their 

 effect on the crew of H. M. ship 

 Triumph, ii. 200. 



Mercury, transit of, over the disc of 

 the sun, i. 112. 



Mercury, fulminating, new, i. 18 ; 

 freezing of, 474 ; action of a mag- 

 net upon, ii. 189, 208. 



and platina, action of upon 



each other, i. 175; palladium a com- 

 bination of, i. 123, 175. 



Meridional arc, great, corrections ap- 

 plied to reduce it to the parliamen- 

 tary standard, ii. 182. 



Mesotype, i. 396. 



Metallic substances, on the powers of 

 as conductors of electricity, ii. 298. 

 titanium, on, ii. 180, 199. 



Metalline substances said to have fall- 

 en on the earth, on, i. 75, 109. 



Metals : new, discovered in platina, i. 

 161, 162 ; on the preservation of by 

 electro-chemical means, ii.207, 213, 

 242 ; modulus of torsion of, ii. 362. 



