550 INDEX. 



Paob. 



Joule's unit of heat indicative of the large mechanical energy re- 

 Kane, Dr. E. K., observations by, of the winds in arctic regions ._ 280 



Key-note of every room dependent on its dimensions 412 



Kinnersly, Mr., experiment by, showing the repulsive energy of 



electric discharge 337 



Kite, electrical, for exploring atmospheric electricity 358, 359, 389 



Kupfer, direction by, of the Kussian system of meteorology 450 



Lamont, observations by, on terrestrial magnetism referred to 349 



Lamp-distances, table of, for candle-powers, in photometry 487 



Lamps for lard-oil improved by Mr. Joseph Funck 495, 497 



Lamps of various kinds employed in light-houses 496 



Lard-oil, experiments on, for light-house illumination 479 



Lard-oil in light-houses effecting a great saving to the Government. 495 



Lard-oil superior to sperm-oil in illuminating quality 481 



Latent heat of condensing atmospheric vapor greatly warming the 



air 56,267 



Latent heat of vapor, the large amount of 225 



Latent heat of water, estimation of 195 



Lateral discharge from a well-connected conductor 340, 341 



Latitude, effect of, on the productiveness of a country 11 



Latitude, the natural temperature of, variously modified 41 



Law, universal dominion of 6 



Laws, moral and social, the uniformity of, established by statistics 6 



Laws of force and motion briefly stated 89, 90 



Le Conte, Prof. John, observations by, on columnar ice crystals __ 211 



Lecture-room, Smithsonian, characteristic features of 420 



Lecture-rooms, acoustics applied to. 406 



Lefroy, Col. J. H., meteorological observations by, at Toronto 178 



Leverrier, direction by, of meteorological system of France 451 



Liebig, estimate by, of weight of ejirbon annually taken from the 



Light and heat analogous to sound 98, 99 



Light-house at Key West struck by lightning, account of 533, 534 



Light-house illumination, oils emploj-ed for 476, 477, 479, 499 



Light, polarization of, explained by transverse vibrations of the 



aether 103 



Lighting at a distance, induction from 334 



Lightning attracted by lightning-rods 392, 393 



Lightning classified by Arago into three different forms 365 



Lightning conductors advisable for telegraph lines 382 



Lightning discharge when strong may occupy the entire mass of a 



rod 399 



Lightning, means of protecting buildings from 384 



Lightning, precautions against 372 



Lightning productive of nitric acid in the atmosphere 344 



