INDEX. 545 



Dalton, inference by, that temperature of elevations is proportional 



to density 4g 



Dalton, method employed by, of determining the dew-point 233 



Dalton, observation by, on the mutual independence of mixed gases. 159, 160 



Dalton, researches of, in meteorology referred to 214, 215 238 



Daniell, Prof. John F., estimate by, of the heating effect of one 



pound of rain 274 



Daniell, Prof. John F., water-barometer devised by 422 



Davy, Sir H., experiment by, on influence of galvanism on iron 



filings 427 



De Doue, observations by, on upper and lower winds 83 



Deep lakes maintaining great uniformity of temperature 196 



De la Beche, popular treatise on geology, commended 515 



De la Rive, hypothesis by, as to the origin of atmospheric electric- 



Dellman, apparatus by, for showing electricity from the earth's in- 

 duction 353, 354 



Density of the air diminished in geometrical ratio, with equally in- 

 creasing altitudes 47 



Density of vapor proportional to its elasticity 224 



Density of water, temperature of greatest 195, 201 



De Kaumer, experiments by, with an electrical kite 389 



Dew, depositions of, investigated by Dr. Wells 248, 249 



Dewey, Prof., meterorological observations by, in Massachussetts. 178 



Dew-point of the air, simple method of determining 233 



Dew-point, the relation of, to the heigth of clouds 265 



Diffusion of vapor through air very slow, without a difference of 



tension 232 



Dove, Prof., views of, as to the compensation of wind currents 83, 84 



Drainage of soils effective in raising their mean temperature 193, 242 



Dufay, theory by, of two complementary electric fluids 311 



Dumas, statement by, of the balance of organic nature 118 



Duplex action of electricity on well-connected conductor 340, 341 



Earth, materials of, almost exhausted of potential energy 38, 132, 458 



Earth negatively electrified 349 



Earth, original heat of, indicated in many ways 153 



Earths, different, heat absorbing capacity of 192 



Earth's induction shown by the electrical state of an insulated long 



vertical rod 352, 354 



Earth's surface practically a slag, or burned out mass 38, 132 



Easter, Dr., experiments by, on temperature expansion of sulphuric 



acid ^25 



Eastward direction of atmospheric movements in the United States. 290 



Echo, aerial, hypothesis in explanation of 524, 525 



Echo dependent upon appreciable interval between a sound and its 



reflection — • — ^"^ 



36-2 



