548 INDEX. 



Paqe. 



Green and Mason, observations by, on upper winds, in balloon 



ascents 281 



Green, Mr. James, sulphuric acid barometer proposed by 423 



Gulf of Mexico the principal source of rain for the eastern portion 



of the United States 289 



Gulf-stream, effect of, on the climate of northwestern Europe 15 



Hail-stones, the mode of formation of 297 



Hall, Prof James, notice by, of electro-magnetic bell signal at 



Albany in 1832 434, 437 



Hamilton, Col. C. S., acknowledgment by, of the superiority of 



Hamilton, Col. C. S., manufactory of rape-seed oil established by_ 478 

 Hare, Dr. Robert, hypothesis by, as to the origin of atmospheric 



electricity 346 



Hare, Dr. Robert, investigation of tornadoes by 292, 293 



Harris, Sir W. Snow, arrangement b3', of lightning-rods for ships- 341 

 Harris, Sir "W. Snow, experiment by, showing line of electric dis- 

 charge 339 



Harris, Sir W. Snow, remark by, on the effect of lightning-rods 392 



Harrison, Mr., process by, of making ice artificially 203 



Hawkins, Mr. C. D., account by, of thunder-storm at Key West 



light-house 533, 534 



Haziness of the air in "Indian summer" possibly due to smoke 



from burning prairies 257 



Heat, absorption of, may be increased by interposed screen 144, 145 



Heat, accumulation of, under glass cover I45 



Heat and moisture (the conditions of vegetable growth) greater to- 

 wards the equator 11 



Heat-capacity, effect of, on the temperature of soils 193 



Heat demonstrated by Count Rumford to be a form of motion 135 



Heat given out by the precipitation of rain, very considerable 22G, 274 



"Heat-lighting," explanation of 365 



Heat, non-luminous, less penetrating than luminous heat 46 



Heat of the earth, original, numerous indications of 153 



Heat retention of different kinds of earth, table of 194 



Heat, the mechanical equivalent of, accurately determined by Joule 136 

 Heat, total diurnal, from the sun in summer greater at the pole than 



at the equator 42 



Height of clouds estimated by depression of the dew-point 265 



Herschel, Sir John, experiment by, on accumulation of solar heat 



in enclosed box 45 



Herschel, Sir John, suggestion by, regarding lunar radiation 253 



Hessard, Capt., observation by, of cloud phenomena in the Alps._ 359 

 Hener, Capt. W. H., observation by, on light-house struck by 



Higgins, Rev. H. H., essay by, " On Vitality " 457 



