552 



INDEX. 



under the influence of a rapid series 

 of equal and opposite induced cur- 

 rents, 43 ; on the application of the 

 principle of reciprocity to acoustics, 

 300; acoustical observations by, 

 456. 



Redier (A.) on the correction of the 

 variations of rate of astronomic 

 pendulums, 80. 



Refraction, on accidental double, 547. 



Resonance, on the sympathetic, of 

 tuning-forks, 78. 



Retina, on a property of the, 158. 



Rivers, on the origin of windings of, 

 in alluvial plains, 228. 



Rock-salt, on the supposed diather- 

 mancy of, 424. 



Rood (Prof. 0. N.) on a property of 

 the retina, 158. 



Royal Society, proceedings of the, 63, 

 144, 228, 295, 389, 467, 527. 



Saline solutions, on supersaturated, 

 304. 



Selenium, on the condensation of va- 

 pour of mercury on, 67; on the 

 action of light on, 295. 



Sound, on the theory of, 271, 343,418; 

 on the reflexion of, at gaseous 

 layers of different density, 346 ; on 

 the mode of propagation of, 441 ; 

 on the perception of the direction 

 of a source of, 456. 



Specific heats of cerium, lanthanum, 

 and didymium, on the, 109. 



Spectra of Venus and aLyrse, on 

 photographs of, 238 ; of metals at 

 the base of flames, on the, 238. 



Spectrum, on the fixed lines in the 

 ultra-red invisible region of the, 

 86, 222. 



Sphene, on some crystals of, 455. 



Spice (R.) on the sympathetic reso- 

 nance of tuning-forks, 78. 



Spottiswoode (W.) on a large induc- 

 tion-coil, 30; on stratified dis- 

 charges, 144, 535. 



Stars, on the photographic spectra of, 

 527. 



Steel, on the magnetization of, by 

 currents, 119, 192. 



Stratified discharges, on, 144, 535. 



Telegraph circuits, on the speed of 

 signalling through heterogeneous, 

 211. 



Terquem (A.) on the employment of 

 a silvered glass as a camera lucida, 

 541. 



Thermo-electric phenomena, on, 156, 

 349. 



Thomson (Prof. J.) on the origin of 

 windings of rivers in alluvial plains, 

 228 ; on contact electricity between 

 non-conductors, 389. 



Tomlinson (H.) on the increase in 

 resistance to the passage of an elec- 

 tric current produced on wires by 

 stretching, 532. 



Trowbridge (Prof. J.) on liquid vor- 

 tex-rings, 290. 



Tschermak (M.) on cosmic vulcanism, 

 316. 



Tuning-forks, on the sympathetic re- 

 sonance of, 78. 



Twisden (Prof. J. F.) on possible 

 displacements of the earth's axis of 

 figure, 311. 



Univalent radicals CwEfem+i, on the 

 number of, 34. 



Van der Willigen (V.-S.-M.) on the 

 portative force of horse-shoe mag- 

 nets, 75. 



Vapours, on the diffusion of, through 

 clay cells, 480. 



Voltaic circuits, on some effects of 

 heat upon, 159. 



Vortex-rings, on liquid, 290. 



Vulcanism, on cosmic, 316. 



Wanklyn (J. A.) on a method of de- 

 termining the amount of proteine 

 compounds in vegetable substances, 

 382. 



Water-substance, on the steam and 



hoar-frost lines of, 512. 

 Wiedemann (Prof. G.) on the laws 

 of the passage of electricity through 

 gases, 161. 



Wohler (Prof.) on the action of 

 the flame of alcohol on the metal 

 palladium, 35. 



END OF THE THIRD VOLUME. 



Printed by Taylor and Francis, Eed Lion Court, Fleet Street. 



