Page:Proceedings of the Royal Society of London Vol 4.djvu/510

484 Howard (Luke) on the wet summer of 1839, 203.

— — on variations of the mean height of the barometer and mean temperature 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 barometer in the climate of London, and on a constant variation of the 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.