512 INDEX. 



Page. 



Bache, Gen'l Hartman, inventor of automatic fog-whistle — 376 



Balloons, rubber toy, used to show direction of the upper winds — 441, 442 



Ball supported by fountain jet, explanation of 254 



Barlow, Mr. Peter, experiments by, on electrical conduction through 



long wires 42,47 



Barnard, Gen'l J. G., co-operation of, in observations on sound __ 434 



Barnard, Mr. T., co-operation of, in observations on sound 473 



Bates, Gen'l, first director of gun-signals on California Coast 375 



Battery currents and induced currents, difference in action of 128 



Battery, galvanic, new arrangement of 80, 81, 82 



Battery, galvanic, one element of 82 



Battery, galvanic, plan of a convertible 84 



Beck, Dr. L. C, assistance of, in electro-magnetic experiments 48 



Becquerel's experiments on phosphorescence 204 



Becquerel, theory by, of electricity in the thundercloud 190 



Bell-buoys as fog-signals , 374 



Biot, experiments on phosphorescence 205 



Birds killed on telegraph wires 253 



Block Island, observations at, on sound 434, 453 



Boscovich's theory of the constitution of matter incomplete 256, 297 



Boston light-station, observations at, on sound 4.34 



Boussingault's theory of animal power 222 



Brard's process of testing building stone with sulphate of soda 346 



Brewster, Sir David, observations of, on color-blindness, etc 233 



Bi-itish Association Keportof 1856, cited 390 



Brown, Mr. T., improvements by, in the siren as a fog-signal 424 



Brown, Mr. T., patentee of the siren, co-operation of, in observations 



on sound 437,458 



Building materials, mode of testing 344,347 



Cactus steamer, used in observations on sound 437, 477, 483 



Calland, observation by, on substituting bundle of wire for solid 



iron 126 



Canton, experiment by, on phosphorescence 204 



Cape Ann light-station, observations at, on sound 430 



Cape Elizabeth light-station, Maine, observations at, on sound 428 



Capillarity in solid metals, influence by their texture 146 



Capillarity of metals, observations on 146, 228 



Capillary transmission of liquids through solids 140 



Case, Commodore Augustus L., co-operation of, in observations on 



sound 392 



Cavendish, on electrical laws 301 



Charles, experiment by, as to range of protection by lightning rod. 195 



Christie, Mr., observations of aurora borealis, in 1831 67 



Chronograph for recording velocity of projectiles 212, 215 



aty of Richmond steamer, observations on, of abnormal phenomena 



of sound 426, 427 



