INDEX. 



547 



Peltier effect and difference of poten- 

 tial, relation between, 353. 



Perry (Prof. J.) on the governing of 

 electromotors, 63. 



Photographic dry plates, on figures 

 produced by electric action on, 

 502. 



Photography of the infra-red of the 

 solar spectrum, on, 391. 



Photometer, on a diffusion, 26. 



Pickering (Prof. S. U.) on therruo- 

 chemical constants, 53. 



Platinum, on the disintegration of 

 ignited, 393. 



Quartine, on the general, 456. 



Rainbow, on the secondary arcs 

 which accompany the, 239. 



Rayleigh (Lord) on the reflexion of 

 light at a twin plane of a crystal, 

 241 ; on the remarkable phenome- 

 non of crystalline reflexion de- 

 scribed by Prof. Stokes, 256. 



Reflexion, on the application of Sir 

 W. Thomson's theory of a con- 

 tractile aether to metallic, 521. 



Refraction, on the indices of, of the 

 metals, 1 ; on the application of 

 Sir W. Thomson's theory of a con- 

 tractile aether to double, 521. 



Regnault's determinations of the 

 specific heat of water, on, 302. 



Reluctance, magnetic, definition of 

 the term, 376. 



Resonance, on a simple pendulum 

 experiment to explain, 396. 



Rocks, notes on the weathering of, 

 475. 



Rowland (H. A.) on the action of a 

 magnet on chemical action, 105. 



Rubies in the matrix from Burmah, 

 note on, 235. 



Riicker (A. W.) on some additions 

 to the Kew magnetometer, 122. 



Rutley (R.) on perlitic felsites, 312. 



Sabine (W. C.) on selective absorp- 

 tion of metals for ultra-violet 

 light, 316; on wave-lengths of 

 metallic spectra in the ultra-violet, 

 342. 



Simon (M. P.) on a lecture experi- 

 ment, 320. 



Solids, on the viscosity of, 183. 



Solutions and gases, on the function 

 of osmotic pressure in the analogy 

 between, 81. 



Soret (J. L.) on the action of elec- 

 tricity on the vesicles of condensed 



water, 465 ; on some phenomena 

 of mirage, 466. 



Soret (J. L. and C.) on Brewster's 

 neutral point, 542. 



Sound, on the velocity of propaga- 

 tion of,^|77 ; on the velocity of, in 

 liquids, 468. 



Spark, on an undulatory movement 

 accompanying the electric, 291. 



Specific gravity of small quantities 

 of dense or porous bodies, on a 

 method of determining, 29. 



heat of liquids near the critical 



temperature, on the changes in 

 the, 467. 



heats, on the recalculation of 



certain, at high temperatures, and 

 the, of water, 298. 



Spectra in the ultra-violet, on wave- 

 lengths of metallic, 342. 



Spectrum, on photography of the 

 infra-red of the solar, 391 ; on the 

 invisible solar and lunar, 505 ; on 

 the absorption, of oxygen, 286. 



Spectroscopic experiments, on some, 

 320. 



Spencer (T.) on evidence of ice- 

 action in Carboniferous times, 311 . 



Steel, on the secular annealing of 

 cold hard, 397. 



Stokes (Prof.), on a remarkable 

 phenomenon of crystalline re- 

 flexion described by, 256. 



Stoletow (M. A.) on a kind of elec- 

 trical current produced by ultra- 

 violet rays, 317. 



Sutherland (W.) on the recalculation 

 of certain specific heats at high 

 temperatures, and the specific heat 

 of water, 298. 



Tanakadate (A.) on the mean inten- 

 sity of magnetization of soft iron 

 bars in a uniform magnetic field. 

 450. 



Thermochemical constants, on, 53. 



Thermoelectric phenomena, on, 353. 



Thermometer, on a constant-volume 

 air-, 149. 



Thompson (Prof. S. P.) on formulas 

 for the lifting-power of magnets, 

 70 ; on continuous-current trans- 

 formers, 157 ; on the conditions of 

 self-excitation in a dynamo ma- 

 chine, 469. 



Thomson (Prof. J.) on flux and re- 

 flux of water in open channels or 

 in pipes or other ducts, 382. 



