594 



Cayley, 139, 149 

 Chandler, 525 



Chemical combination, heal of, 

 _ i 24-6, 428-430, 435 

 Civil and military engineering, 



208-210 

 Clairaut, 41 

 Clarke, Capt., 270 

 Clausius, 162, 164 

 Climate, warm in arctic regions, 



273-280 

 Clock, astronomical, 40, 41, 



387-394 



Coal, exhaustion of, 441 

 Colour of stars, influence of 



motion on, 180-183 

 Comets, 190-196 

 ' Condenser, Joule's surface, 5 63 4 

 Conservation of energy, 457- 



458, 462-464 

 in earth, 108, 1 10 

 Convection of heat by water and 



ice, 285-288 

 air currents, 288-290 

 Coulomb, 540 

 Crookes, 551-6 



D 



Dalton, 559-60, 570 

 Dark lines in spectrum, 168 

 Davy, 122, 176, 421, 422, 457 

 Delaunay, 39-41, 69-71, 270 

 DC Morgan, 140 

 Descartes, 534 

 Dew, 1-5, 291 

 Dido, 571-4, 582 5 

 Dip, magnetic, 217, 218 

 Doctrine of uniformity, 6-9, 44 

 Dufour, 70, 71, 96 

 Dunthornc, 37, 39 

 Dynamo, 448-455 



Ear, perception of heats by, 409 

 -412 



Earth, as a timekeeper, 31-32, 

 38-43, 68-72, 93- 

 96, 262-272 

 axis of and meteorological 



changes, 266 

 rotation of, 262 270 

 electric capacity of, 231 



footnote 

 internal condition of, 299- 



318 

 temperature of, 238- 



243 



life on, 197-205, 469 

 liquid in interior of, 243 

 origin of life on, 197-205 

 physical condition of, 238- 



272 



radiant heat of, 1-5 

 rigidity of, 119, 225, 251- 



253, 3I6-3I8 

 test by direction of ap- 

 parent gravity, 256- 

 259 



and tides, 253 

 rotational period of, 270- 



272 



motion of and energy, 436 

 temperature of in past, 104 



-107 

 yearly loss of energy in, 



116, 117 



Eclipse of the sun, 183, 184 

 Elasticity, atomic, 164 

 Electric capacity of earth, 231 



footnote 



light in lighthouses, 449 

 machine, 449 

 transmission of power, 448 



.-455 



Electricity, accurate measure- 

 ment of, 212-215 

 atmospheric, 216, 227, 228 

 in vacno, 550-557 

 vitreous and resinous, 548- 



ifica 



Electrification of air, 228 236 

 Elements, heat of combination 

 of, 125 



