INDEX. 



549 



moon's mean motion, 285 ; on the 

 nature of heat-vibrations, 346 ; on 

 the cause of the cooling effect pro- 

 duced on solids by tension, 380. 



Cubic surfaces, on the theory of, 493. 



Cumarine, researches on, 107- 



Dawes (Rev. W. R.) on the telescopic 

 appearance of the exterior envelope 

 of the sun, and of its spots, 156,306. 



De la Rive (M.) on Thomson's method 

 for measuring electrical conducti- 

 vity, 77. 



Diathermancy, on the influence of 

 condensation in experiments upon, 

 24.9. 



Differential covariants, on, 225. 



equations of the first order, on, 



355. 



Distillation, on the theory of frac- 

 tional, 382. 



Drach (S. M.) on deducing the paral- 

 lax of Mars and thence that of the 

 sun, 50; on the circumference of 

 the circle, 318; on Albert Durer's 

 heptagon-chord, 320. 



Earnshaw (Rev. S.) on the velocity 

 of sound, 98. 



Earth, on the climate of the, in palaeo- 

 zoic times, 236 ; on the influence 

 of the tidal wave on the rotation of 

 the, 285 ; on the nature of the 

 sun's magnetic action upon the, 

 384. 



Electric currents induced by a mag- 

 net in a rotating conductor, on the, 

 506. 



Electrical conductivity, on Thomson's 

 method for measuring, 77 



fly, experiments on the, 202. 



Ellis (A. J.) on a simple formula for 

 calculating heights, 68. 



Energy, on the principle of the con- 

 servation of, 56. 



Erlenmeyer (M.) on propyle com- 

 pounds, 108; on the action of 

 nascent hydrogen on cinnamic 

 acid, 111. 



Eugenic acid, on the motions of, on 

 the surface of water, 528. 



Eye, on the position of the optic cen- 

 tre of the, 316. 



Ferricum, or the hexatomicity of, 115. 



Figures, on reciprocal, 250. 



Fischer (M.) on some new acids, 1 12. 



Fluid in motion, on some effects pro- 

 duced by a, 36. 



Forces, on the direct correlation of 



mechanical and chemical, 145 ; on 



diagrams of, 250. 

 Frames, on the calculation of the 



equilibrium and stiffness of, 294. 

 Frankland (Prof. E.) on the physical 



cause of the glacial epoch, 321. 

 Fuses, on the duration of the com- 

 bustion of, under different pres- 

 sures, 379. 

 Galvanic battery, on the dynamics of 



the, 52, 353. 

 Gas battery of Mr. Grove, on the 



theory of the, 54. 

 Gases, remarks on the theory of, 75 ; 



on the direct determination of the 



specific heat of, 341. 

 Gassiot (J. P.) on spectrum analysis, 



143. 

 Geological Society, proceedings of 



the, 73, 154, 476, 542. 

 Gibbs (Dr. W.) on the determination 



of nitrogen by weight, 537. 

 Gill (J.) on the dynamical theory of 



heat, 84, 477- 

 Gilm (M.) on hydroberberine, 114. 

 Girard-Teulon (M.) on the position of 



the optic centre of the eye, 316. 

 Glacial epoch, on the physical cause 



of the, 321. 

 Glaciers, on the theory of the motion 



of, 539. 

 Glycerine, on the action of biniodide 



of phosphorus on, 110. 

 Gore (G.) on the electrical relations 



of metals, 446. 

 Graham (T.) on the constitution of 



matter, 81. 

 Gruel (C. A.) on the artificial produc- 

 tion of asterism, 400. 

 Gun-cotton, on the electrical proper- 

 ties of, 240. 

 Hagen (M.) on the heat of the sun's 



rays, 478. 

 Hahn (M.) on the gases disengaged 



on dissolving cast iron, 498. 

 Hamilton (Sir W. R.) on Robcr's 



construction of the heptagon, 124. 

 Hargreave (Dr. C. J.) on differential 



equations of the first order, 355. 

 Heat, on the dynamical theory of, 84, 



194, 196, 477. 



■ , radiant, researches on, 396. 



• vibrations, on the nature of, 



346. 

 Heights, on a simple formula for cal- 



