576 



INDEX. 



Seismometer, on a new, 47. 



Sky, a new explanation of the colour 

 of the, 425. 



Smyth (P.) on carbon and carbo- 

 hydrogens pectroscoped and spec- 

 trometed in 1879, 107. 



Solar rays, on the influence of, on 

 vegetation, 550. 



Sonometer, on a new, 51. 



Sound, on the source of, in the Bell 

 telephone, 129 ; on the mechani- 

 cal equivalent of, 299. 



Spectrometer, on a new form of, 75. 



Spectroscope, investigations in optics 

 with special reference to the, 261 , 

 403,477. 



Spectrum, on the distribution of the 

 intensity of light in the, 75 ; of 

 Brorsen's comet, on the, 178 ; on 

 the distribution of heat in the vi- 

 sible, 203. 



Spottiswoode (Dr. W.) on a mode of 

 exciting an induction-coil, 390. 



Stefan (J.) on the deviation of Am- 

 pere's theory of magnetism from 

 the theory of the electromagnetic 

 forces, 83. 



Steel, on the relation between the 

 thermoelectric properties, the spe- 

 cific resistance, and the hardness of, 

 341 ; on the alteration of the den- 

 sity of, by hardening and temper- 

 ing, 421. 



Stokes's law, observations on, 179. 



Sun, on the temperature of the, 324, 

 438. 537. 



Sylvester (Prof. J. J.) on an equation 

 in finite differences, 120. 



Telephone, on the source of sound in 

 the Bell, 129. 



Thompson (Prof. St P.) on unilateral 



conductivity in tourmaline crys- 

 tals, 18 ; on the source of sound 

 in the Bell telephone, 129 j on 

 magnetic figures and the magnetic 

 behaviour of fixed iron filings, 134 ; 

 on the pseudophone, 385 ; on the 

 action of magnets on mobile con- 

 ductors of currents, 505. 



Tourmaline crystals, on unilateral 

 conductivity in, 18. 



Universe, on the possibility of ac- 

 counting for the continuance of re- 

 curring changes in the, 152. 



Ussher (W. A. E.) on the Palaeozoic 

 districts of West Somerset, 419. 



Vapour-densities, on the determina- 

 tion of, of substances that attack 

 mercury, 424. 



Vapours, on the tension of, near 

 curved surfaces of their liquids, 

 382. 



Vegetation, on the influence of the 

 solar rays on, 550. 



Violle (J.) on the specific heats and 

 melting-points of divers refractory 

 metals, 501. 



Visual phenomenon, on a, 334. 



Waage (Prof.) on chemical affinitv, 

 182. 



Waltenhofen (Dr. A. von) on a direct 

 measurement of the work of induc- 

 tion, 258. 



Weber (H. F.) on the true theory of 

 Fresnels interference phenomena, 

 339 ; on the elementary law of hy- 

 drodiffusion, 487, 523. 



Young (Prof. C. A.) on the spectrum 

 of Brorsen's comet, 178. 



Zinc, on the separation of, from cad- 

 mium and copper, 433. 



END OF THE EIGHTH VOLUME. 



Printed bv Tayj.or and Francis. Eed Lion Court. Fleet Street. 



