INDEX. 557 



Page. 



Stratton, Mr. James, form of rain-gage adopted by 262 



Stratum, subterranean, of uniform temperature 1S2 



Sturgeon, Mr. "\V., production by, of the electro-ma"'net 428 429 



Subterranean temperatures, general laws of 1S2 183 



Sulphuric acid barometer employed at the Smithsonian Institution . 423 

 Summer and winter temperatures, due to different obliquity of sun's 



Sun recognized as the source of nearly all terrestrial changes 38 



Sun's declination, influence of, on rain-belts and wind-belts 68, 82 



Sun's total diurnal heat in summer greater at the pole than at the 



equator 40 



Sun the origin of vegetable and animal power 122 458 



Surface tendency of electric discharge 342 



Telegraph, application of, to weather premonitions 438, 440 



Telegraphic announcement of approaching floods to lower parts of 



rivers 259 



Telegraphic meteorology established by the Smithsonian Institu- 



Telegraph made use of to determine atmospheric movements in the 



United States 290 



Telegraph wires, effect of, on lightning 380 



Temperature due to latitude, modified toward the poles 41 



Temperature of elevations diminished with the density of the air__ 48 



Temperature of soils raised by efficient drainage 193 



Temperature of space, researches of Pouillet on 147, 148 



Temperature of the air reduced by elevation from earth's surface 12 



Temperature of the United States, distribution of 71 



Temperature, terrestrial, the residual after loss by radiation 43, 44 



Temperatures below the surfece of the earth 182, 183 



Test of the inflammability of petroleum by flashing 502 



Theory distinguished from hypothesis 310 



Thermal variation of the air not a probable cause of atmospheric 



electricity 347 



Thermometer readings, various methods of reducing 177, 178 



Thermometrical observations, precautions necessary inmaicing 175, 17G 



Thomson, Prof. William, atomic theory developed by 91 



Thomson, Prof. William, on conservation of energy, quoted 138 



Thunder-cloud, induction from 333, 334 



Thunder-clouds observed to assume an " hour-glass " form 360, 361 



Thunder-storm at Key West light-house, observations on 533, 534 



Thunder-storm at New London, Conn., observations on 531 



Thunder-storm, peculiar effects of, observed at the Smithsonian 



Institution 391 



Thunder-storms artificially produced— 364 



Thunder-storms productive of nitric acid in the atmosphere 344 



Thunder-storms, suggestions as to method of observing 529, 530 



