576 



INDEX. 



Salet (G.) on the spectra of nitrogen 



and Jthe alkali-metals in (Teissier 



tubes, 331. 

 Saline solutions, on the action of heat 



on the absorption-spectra and che- 

 mical constitution of, 244. 

 Schwendler (L.) on the general 



theory of duplex telegraphy, 520. 

 Secchi (Father) on the displacement 



of the lines in the spectra of the 



stars, 669. 

 Selenium, on the action of light on, 



155, 322 j on a new compound of, 



405. 

 Serpentinite of the Lizard, on the, 



280. 

 Serrano y Fatigati (Don E.) on some 



poiuts in a programme of physics, 



456. 

 Signal-lights, on the visibility of 



scintillating, 171. 

 Sodium, on the spectrum of, 333. 

 Solar spectrum, on photographing 



the least-refracted portion of the, 



414. 

 system, on the equilibrating 



forces of the, 315, 507. 

 Soimd, on the refraction of, by the 



atmosphere, 324. 

 Sounding of two notes, on the simul- 

 taneous, 417, 511. 

 Spectra, on the production of, by the 



oxyhydrogen flame, 67. 

 of the stars, on the displacement 



of the lines in the, 5G9. 

 Spectroscope, on a new arrangement 



for the micrometer of the automatic, 



314. 

 Spice (R.) on a simple method of 



tuning two forks to unison, 572. 

 Spottiswoode (W.) on the cause of 



stratification in electrical dis- 

 charges in vacuo, 239. 

 Squares, on the representation of an 



uneven number as the sum of 



four, 44. 

 Stars, on the displacement of the 



lines in the spectra of, by their 



motion in space, 569. 

 Steel, on the distribution of mag- 

 netism in circular or elliptic plates 



of, 85 ; on the magnetism of bars 



of, 188, 293. 



Stoney (G. J.) on Crookes's radio- 

 meter, 177, 305. 



Sulphur, on a new oxide of, 398. 



Szily (C.) on the mechanical theory 

 of heat, 22. 



Taylor (H. M.) on the relative value 

 of the pieces in chess, 221. 



Telegraph-signals, on the determina- 

 tion of the longitude of Cairo from 

 Greenwich by, 890. 



Telegraphy, on duplex, 32, 520. 



Tellurium, on the action of light on, 

 322. 



Thermodynamics, on the second law 

 of, 22,61, 360. 



Tides, on a controverted point in 

 Laplace's theory of, 182. 



Time, on a method of measuring 

 small intervals of, 337. 



Tisley (S. C.) on a new dynamo- 

 magneto-electric machine, 71. 



Trowbridge (Prof. J.) on the effect 

 of thin plates of iron used as 

 armatures to electromagnets, 604. 



Tschemiak (Prof. G.) on the forma- 

 tion of meteorites, and volcanic 

 agency, 497. 



Unitation, on, 540. 



Vapours, on some simple relations 

 between the latent heats, atomic 

 weights, and tensions of, 477. 



Verdet's constant, on the determina- 

 tion of, in absolute units, 73. 



Volatile liquids, on the application 

 of the mechanical theory of heat 

 to the study of, 477. 



Volcanic energy, on Mallet's theory of, 

 19, 138 ; agency, observations on, 

 497. 



Walenn (W. H.) on unitation, 540. 



Ward (J. C.) on the granitoid rocks 

 of the Lake-district, 101. 



Wave-apparatus, on a new form of, 



229. 

 Waves, on the theory of, 257. 

 Weber (Prof. R.) on a new oxide of 

 sulphur and an analogous selenium 

 substitution-product of the same, 

 398. 

 Woodward (C. J.) on a new form of 



wave-apparatus, 229. 

 Young's theory of colours, on the 

 history of the discovery of, 111. 



END OF THE FIRST VOLUME. 



Printed by Tayloh and Francis, Bed Lion Court, Fleet Street. 



