478 



INDEX. 



percussion, 247; action of on glau- 



berite, 417. 

 Hemicing's (Mr.) safety-tube for the 



combustion of oxygen and hydrogen, 



82. 

 Hcnwood (W. J.) on the variations in 



springs, 2S7. 

 Herschel (Sir J.) on the action of light 



in determining the precipitation of 



muriate of platinum by lime-water, 



58; on subterranean sounds, 221. 

 Horizon-sector, on the measurement 



of the instrumental error of the, 98. 

 House-spider, observations on the, 95. 

 Hydrocyanic acid and cyanurets, con- 

 version of into ammonia and formic 



acid, 83. 

 Hydrogen and oxygen, safety-tube for 



the combustion of, 82. 

 Insects, several new British forms 



among the parasitic hymenopterous, 



127. 

 Iron, separation of Uie oxides of, 86. 

 Iron beams, on the strength and best 



form of, 207. 

 Iron, cast, on the elastic power of, 74. 



the temperature of melting, 262 ; 

 Isothermal lines, on 431. 

 Jloiilouk, mean temperature of, 427. 

 Kupffer (Prof.) on some recent mag- 



netical discoveries, 129; on the mean 



temperature of Nicolaieflf", 1 32 ; on 



the mean temperature of Sevastopol, 



259 ; Dr. Brewster's observations 



on, 260 ; on the mean temperature 



of Sitka in America, 427. 

 Lava, on the curvilinear structure of, 



228. 

 Lead and bismuth, separation of the 



oxides of, 326. 

 Lenses, on giving conic-sectional 



figures to, 55. 

 Light, action of in determining the 



precipitation of muriate of platinum 



by lirtie'water, 58 ; effect of on the 



retina, 251 ; on experiments relative 



to the interference of, 433. 

 Lightning, on the effects of a stroke 



of, 191. 

 Lime, carbonate of, formation of, 84. 

 Lime-water, precipitation of muriate 



of \)latinum by, determined by the 



action of light, 58. 

 Linnaean Society, present of the East 



India Company's herbarium to the, 



71. 

 Lisbon and Oporto, on the geology of, 



227. 

 Lithotrity, Baron Hcurteloup's im- 

 provements in, 75. 

 Lloyd's (Capt.) levelling from the sea 



tothe'lliames at London Bridge, 187. 



London, historical account of, 364, 



London clay, on the, 233. 



Longitude deduced from the moon's 

 right ascension, on the, 60. 



Lubbock's (Mr.) researches in phy- 

 sical astronomy, 69, 381, 389. 



Luetke's (Capt.) account of experi- 

 ments with an invariable pendulum, 

 420. 



Lunar occultations for July, 87 ; Au- 

 gust, 167 ; September, 247 ; Octo- 

 ber, 327; November, 405; December, 

 473. 



Magnet, on an electric spark from a, 

 49, 63. 



Magnetism, action of on electro- dyna- 

 mic spirals, 45. 



Magnetical discoveries, notice of some 

 recent, 129. 



Magnetic-needle, irregularities in its 

 vibrations produced by warmth, 310. 



Magnetic polarity, on tlie distribution 

 of, 31. 



Magneto electricity, Mr. Prideaux on, 

 S09. 



Magneto-electric current, effect of in 

 chemical decomposition, 161 ; on 

 the chemical action of, 441. 



M'Intyre's (Dr.) remarks on the for- 

 mula for boroughs, reply to, 26. 



Mammalia, carnivorous, experiments 

 on feeding, .■i95. 



Manufactures and machinery, Mr. 

 Babbage on, 208. 



Maps, on geological, 446. 



jl/nrs, ephemeris of stars to \ie obserred 

 with at the ensuing opposition of 

 that planet, 323, 406, 474. 



Measures used in Covent Garden 

 Market, dimensions of, 472. 



Megatherium, discovery in Buenos 

 Ayres of three skeletons of the, 233. 



Mercury, tiansit of, observed at Ge- 

 neva, 246; transit on May 5th, 322. 



Metalliferous deposits, on the relative 

 position with regard to the unstrati- 

 fied rocks, 225. 



Metalliferous veins, questions on, 469. 



Metals, fusing points of, 202. 



Meteor, seen June 29tli, Mr. Ed- 

 monds's notice of, 306; Mr. Pri- 

 deaux's, 307. 



Meteorological table, by Mr. Thompson, 

 Mr. Giddy, and Mr.'Veall: for May, 

 88; June,' 168; July, 248; August, 

 3'Jrf; September, 408; October, 475. 



Miehell on stratification, 268. 



Mines, variation of the quantity of water 

 in, 288. 



Mirror, account of a curious Chinese, 

 438. 



Moliusca, on marine testaceous 384. 



