INDEX TO VOLUME II. 



Paoe. 



Absorption and emission of dark heat, not aflfected by color 192 



Absorption, electrical, instruments for observing 359 



Absorption of radiant heat may be increased by interposed screen. 144, 145 



Absorption of sound by various substances 414 415 



Acoustic phenomena of fog-signal at Whitehead observed 520 



Acoustics as applicable to public halls 403 



Address to the National Academy of Sciences 536 538 



Aerial currents available for balloon voyages 442, 444 



Aerial currents of northern hemisphere, divided into three systems. 275, 279 



Aerial friction not a probable cause of atmospheric electricity 346 



Aeronautics possible by selection of atmospheric currents 443, 444 



^therial medium, a material substance possessing inertia and elas- 

 ticity 95, 96 



^therial medium, a 2>lenn7n of, throughout space 91 



-^therial medium supposed to be the agent of electrical disturb- 

 ance 105, 313, 346 



Agriculture improved by scientific research 10, 11, 86, 88 



Air, rarified, a better conductor of electricity than air at ordinary 



density ._ 344 



Air warmed by the condensation of atmospheric vapor 55, 56, 267 



Alden, Mr., lard-oil for light-houses, manufactured by 485 



Alexander, Capt. B. S., architect of Smithsonian lecture-room 421 



Alexander, Prof. J. H., experiments by, on illuminating oils 478 



Allotropism of elementary substances, illustrations of 115 



Ampere, discovery by, of the mutual influence of two galvanic 



Ampere, electrical theory of, referred to 106 



Animal bodies built up by the transformation of vegetable mate- 

 rial and power 126, 137 



Animal bodies machines for the application — not the creation — of 



power 127, 457 



Animal power derived entirely from the food 457 



Animals and plants composed chiefly of solidified gas 8 



Annales de Chimie et de Physique cited 427, 428 



Annals of Philosophy cited 427 



Aqueous vapor and air equally affected as to elasticity, by temper- 

 ature 219 



Aqueous vapor a partial conductor of electi'icity 357, 358 



Aqueous vapor from fresh water more elastic than from salt water. 221 



Aqueous vapor non-diathermanous to heat of low intensity 46 



(541) 



