INDEX. 



553 



a spectroscope with a number of 

 prisms, 110; on the heat of fric- 

 tion, 241 ; on the aqueous lines of 

 the solar spectrum, 337. 



Copper-mines of Michigan, remarks 

 on the, 482. 



Croll (J.) on the excentricity of the 

 earth's orbit, 26 ; on the physical 

 cause of the submergence and emer- 

 gence of the land during the glacial 

 epoch, 301. 



Dawson (Dr. J. W.) on the conditions 

 of the deposition of coal, 158. 



De la Rue (W.) on the decrease of 

 actinic effect near the circumference 

 of the sun, 243. 



De Wilde (M.) on acetylene, 456. 



Diacon (M.) on the influence of the 

 electro-negative elements on the 

 spectra of the metals, 483. 



Drosier (Dr.) on the functions of the 

 air-cells, and the mechanism of re- 

 spiration in birds, 230. 



Dupre (P.) on the law of the union 

 of simple substances, and on attrac- 

 tions at small distances, 548. 



Earth, on the change of excentricity 

 of the orbit of the, as a cause of 

 change of climate, 26, 374 ; on the 

 axial rotation of the, 210, 323 ; on 

 the retardation of the velocity of 

 rotation of the, 322 ; on the fluid 

 theory of the, 430 ; on the obser- 

 vations and calculations required to 

 find the tidal retardation of the ro- 

 tation of the, 533; on a possible 

 geological cause of changes in the 

 position of the axis of the crust of 

 the, 537. 



Earthquakes, observations on, 45. 



Edlund (E.) on the relation between 

 the heat disengaged by induction- 

 currents and the mechanical force 

 employed to produce it, 253. 



Edmonds (R.) on earthquakes and 

 extraordinary agitations of the sea, 

 45. 

 Edmonds (T. R.) on the law of human 

 mortality expressed by a new for- 

 mula, 1. 

 Electric spark, on the heat of the, 427. 

 Electrical resistance, on the unit of, 



325, 376. 

 Electrodes, on the explosive distance 

 of the direct induced current be- 

 tween similar, 107. 



Elements, on the refractive equivalent 

 of the, 483. 



Equation, on the separation of the 

 roots of an algebraical, 214. 



Euler's theorem, on an instantaneous 

 proof of, 52. 



Evans (J.) on geological changes in 

 the position of the axis of the 

 earth's crust, 537. 



Everett (Dr. J. D.) on the flexural 

 and torsional rigidity of a glass rod, 

 476. 



Farmer (M. G.) on the mechanical 

 equivalent of light, 403. 



Feldmann (M.) on laserpitine, 451. 



Fick (Prof.) on the retardation of the 

 earth's velocity of rotation, 322; 

 on the origin of muscular power, 

 485. 



Force and matter, on the fundamental 

 ideas of, 459. 



Forces, on the composition of, 245, 

 404. 



Frankland (Prof. E.) on St. Elmo's 

 fire, 321. 



Gases, studies on, 124, 181 ; on the 

 electrical conductivity of, under 

 feeble pressures, 319. 



Geological Society, proceedings of 

 the, 155, 237, 318, 399, 477, 545. 



Gill (J.) on regelation, 119. 



Glacial epoch, on the level of the sea 

 during the, 1/2, 301, 372, 532. 



Glass, on the coloration of, by sele- 

 nium, 84 ; on the rigidity of, 476. 



Glennie (J. S. S.) on the axial rota- 

 tion of the earth, 323. 



Guthrie (Prof. F.) on the axial rota- 

 tion of the earth, and the resist- 

 ance, elasticity, and weight of solar 

 aether, 210. 



Haughton (Rev. S.) on the change of 

 eccentricity of the earth's orbit 

 as a cause of change of climate, 

 374. 



Heat, on the true capacity for, 28; 

 on diminution of direct solar, in the 

 upper regions of the atmosphere, 

 104, 261 ; on the mechanical equi- 

 valent of, 135 ; of friction, on the, 

 241 ; on the relation between the, 

 disengaged by induction-currents, 

 and the mechanical force employed 

 to produce it, 253. 

 Heath (D. D.) on secular local changes 

 in the sea-level, 201, 323. 



