484 



INDEX. 



Howard (Luke) on the wet summer 

 of 1839, 203. 



— — on variations of the mean height 

 of the barometer and mean tempe- 

 rature and depth of rain, from 1815 

 to 1823, 211. 



on the variation, through a cycle 



of nine years, of the mean height of 

 the barometer, mean temperature, 

 and depth of rain, 226. 



on a cycle of eighteen years in 



the mean annual height of the ba- 

 rometer in the climate of London, 

 and on a constant variation of tlie 

 barometrical mean according to the 

 moon's declination, 292. 



on a remarkable depression of 



the barometer, 292. 



on the prevailing winds, mean 



temperature and depth of rain in 

 the climate of London, 299, 300. 



Howlett (S. B.), description of a com- 

 pensating barometer, 133. 



Hull, on the epidemic influenza at, 

 381. 



Humboldt (Baron), his visit to the 

 Royal Society, 370. 



, his proposal for the establish- 

 ment of magnetical observatories, 

 9, 170. 



Hume (Sir A.), notice of the late, 94. 



Hunt (R.) on the influence of iodine 

 in rendering argentine compounds, 

 spread on paper, sensitive to light, 

 239. 



Hurricane at Dumfries, Jan. 7, 1839, 



account of the, 123. 

 Hydraulic theory of shells, 81. 

 Hydriodic salts, of the whitening power 



of, on paper prepared by the action 



of solar light, 208. 

 Hydrosen, the equivalent numbers of, 



123." 



Hydropneumatic baroscope, descrip- 

 tion of a, ] 26. 



Hygrometer (the Royal Society's), on 

 the position of the, 3. 



Hylseosaurus, or Wealden lizard, 290, 



Ice at the bottom of running water, 

 295. 



Iguanodon, on the lower jaw of the, 

 290. 



India, on the Regar or black cotton 

 soil of, 53. 



— — , papers from the magnetic ob- 

 servatories in, 361. 



Indian seas, on tide observations made 

 in the, 153, 217. 



Induction, on, 37, 49, 54. 



, electrolytic, 51. 



, an action of contiguous parti- 

 cles, 38, 42 ; in curved lines, 39. 



, electric, 156. 



Inductive capacity, specific, 40, 392; of 

 shell-lac 40; of glass, 41; of sulphur, 

 41 ; of oil of turpentine 41 ; of nap- 

 tha, 41 ; of air, 41 ; of gases, 41. 



apparatus, 38. 



Inductometer, differential, 59, 100. 



Influenza, epidemic, at Hull, 381. 



Insulation, electric, 50. 



Insulators and conductors, analogy of, 

 50. 



Integral, triple, on the variation of a, 

 42. 



Invertebrata, on the minute structure 

 of the skeletons of the, 435, 407. 



Iodide of potassium, on the nature and 

 properties of, 473. 



Iodine, its influence in rendering ar- 

 gentine compounds, spread on paper, 

 sensitive to light, 239. 



Iodized paper, preparation of, 312. 



Ipswich, on the tides at, 445. 



Iris, structure and mode of action of 

 the, 439. 



Iron-built ships, on the deviation of 



the compass in, 141. 

 Iron, cast, on the strength of pillars 



of, 227. 



, wrought, on the strength of 



pillars of, 228. 



Ivory (J.) on such ellipsoids as are 

 capable of having the resultant of 

 the attraction of the mass upon a 

 particle in the surface, and a cen- 

 trifugal force caused by revolving 

 about one of the axes, made per- 

 pendicular to the surface, 34. 



on the theory of astronomical 



refractions, 59, 60. 



on the conditions of equilibrium 



of an incompressible fluid, 157. 



, a Royal medal awarded to, 172. 



, biographical notice of, 406. 



Jalap, resin of, 219. 



Jeffreys (Julius) on t\\e solubility of 



sihca by steam, 232. 

 Jellicoe (C.) on the laws of mortality, 



115. 



Jesse (J.), description of an observa- 

 tory constructed at Ardwick, 371. 



