INDEX. 543 



Paoe. 



Barometer, variations of, during thunder-storms 295 



Barometer with sulphuric acid employed at Smithsonian Institu- 

 tion 423 



Barometer with water, devised by Mariotte, von Guerecke, Daniell, 



and others , 42i 422 



Barometric pressure either increased or diminished by added vapor. 270 



Beccaria, experiments by, on lightning-rods 386 389 



Becquerel, observations by, on deposition of dew on different sub- 

 stances 250,251 



Behring's Strait warmed on the eastern side and cooled on the 



western jg 



Bell signal, electro-magnetic, devised at Albany in 1831 434 



Belt of high barometer at about 30° latitude 279 



Biot and Gay-Lussac, electrical observations by, in balloon ascent- 350 



Biot, remark by, on latent truth in popular errors 253 



Boston, advantageous position of, for telegraphic meteorology 441 



Boussingault, account by, of smoke-clouds employed to protect 



vines from frost 256, 257 



Bouvard, meteorological observations by, at Observatory of Paris- 178, 179 



Boyle and Mariotte's law of gaseous compression referred to 155 



Brandes, detection by, of salts in rain-water 166 



Brewster, Sir David, formula by, for temperature of different lati- 



British system of meteorology 450, 451 



Brooks, Mr., observation by, of thunder-storms below the horizon. 366 



Brydone, Mr., description by, of remarkable inductive effects from 



distant thunder clouds 369 



Buildings, protection of, from lightning 384 



Bunsen's photometer employed in testing illuminating oils 485 



Canada, meteorological system of 449, 450 



Candle powers, table of, for lamp distances, in photometry 487 



Capillarity or surface attraction of petroleum very great 508 



Carbonic acid of the atmosphere the principal pabulum of plants-. 122 



Carbonic acid, variable amount of, in the atmosphere 163 



Caribbean Sea a frequent origin of storms in the U. S 287, 292, 307, 452 



Carj-sfort Keef light-house. Key West, Florida, struck by lightning. 533, 534 

 Caswell, Prof. A., temperature observations by, at Providence, K. I. 180 



Cavendish, theory by, of electric fluid 311, 313 



Chappelsmith, Mr., tornado investigated by 293 



Chemical compounds formed in multiples of atomic weight as well 



as of volume 110, 112 



Chemical groupings limited by atomic weights 110 



Chevandier, estimate by, of weight of carbon annually taken from 



the air by forests 1G4 



Circulation of sap in plants effected by capillarity, endosmosis, and 



heat 185 



