INDEX. 517 



Page. 



" Intensity " battery productive of stronger initial induction 1.52 



" Intensity " current induced by one of "quantity " 118, 157 



" Intensity " currents of induction from wire helices 1.51 



Interference of heat 'J83 



Jris, steamer, used in observations on sound 487 



Iron in axis of flat spiral, effect of 96 



Invention different from discovery 319, 320 



Ivory, James, on the theory of liquid cohesion and capillarity 218 



Joslin, Professor, account of aurora borealis, 19th April, 1831 64 



Keeney, Captain, of light-house steamer Mistletoe, assistance of, in 



observations on sound 388,391,453 



Lateral discharge of electricity increased by self-induction 102 



Lateral discharge of free electricity from fine wire 101 



Lead having mercury transmitted through it by capillarity 146 



Lead, sheet, between building stones a source of weakness 348 



Lecture on flame, notice of 2 



Lederle, Mr., co-operation of, in observations on sound 379, 392, 421 



Lenz, observation on different armature coils of magneto-electric 



machme 117 



Leyden jar, on the phenomena of 293 



Liebig's theory of animal power 222 



Light, experiment on magnetic polarization of 243 



Light-houses, beacons, and signals in the United States 366 



Light-house Board Report quoted 426, 447, 487 



Light-house Board, United States, organization of 366 



Light-house protection from lightning 498, 499 



Light-house service of the United States 364 



Lightn 

 Lightn 

 Lightn 

 Lightn 

 Lightn 

 Lightn 

 Lightn 

 Lightn 

 Lightn 



ng flash magnetizing needles at the distance of many miles. 208 



ng, personal experience with 196 



ng, protecting light-houses from 498, 499 



ng, protection of houses from 231 



ng, relation of telegraph lines to 244 



ng-rod, range of protection by 195 



ng-rods, on the forms of 291 



ng, some effects of, due to induction 140 



ng strokes, expansive energy of 2.32,290 



Little Gull Island, observations at, on sound 433, 469 



Liquid cohesion equal to solid cohesion 218, 3-53 



Liquid, decomposition of, by current from long wire 88 



Liquid, decomposition of, by single pair of galvanic plates 95 



Liquids, experiments on the cohesion of 217, 218 



Liquidity the result of mobility, not of diminished cohesion 3-53, 354 



London and Edinburgh Journal of Science quoted 92 



Loomis, Prof. Elias, remarks on paper by 291 



