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INDEX. 



Silver, on the fluoride of, 309. 



Sodium -line, on the inversion of the, 

 404. 



Spectra, of carbon, on the, 12 ; of in- 

 candescent gases, on the influence 

 of density and temperature on the, 

 190; of gases, on the cause of the 

 interrupted, 291 ; on a method of 

 fixing, photographing, and exhibit- 

 ing magnetic, 476. 



Spectroscope, on the examination of 

 the Bessemer-flame with the, 4 ; on 

 a small universal stellar, 129; on a 

 registering, 544. 



Spectrum of the aurora borealis, on 

 the, 79, 122. 



Spottiswoode (W.) on successive po- 

 larization of light, 398. 



Stoney (G. J.) on the cause of the in- 

 terrupted spectra of gases, 29 1 . 



Storms, on the barometric depression 

 in, 429. 



Streams, on the mathematical theory 

 of combined, 67. 



Strutt (Hon. J. W.) on the light from 

 the sky, its polarization and colour, 

 107, 274 ; on the theory of reso- 

 nance, 239 ; on the scattering of 

 light by small particles, 447; on 

 double refraction, 519. 



Tangent-balance, on the, 443. 



Temperature, on the influence of, on 

 barometric pressure, 325. 



Thermodynamics, on the hypothesis 

 of molecular motions in, 62, 127. 



Thomson (Sir W.) on approach caused 

 by vibration, 423; on modifications 

 of Wheatstone's bridge, 537 ; on a 

 constant form of Daniell's battery, 

 538. 



Tides, on the theory of the, 120. 



Varley (C. F.) on the polarization of 

 metallic surfaces in aqueous solu- 

 tions, 310. 



Vaughan (D.) on secondary planets 

 in small orbits, 508. 



Vibration, on approach caused by, 

 405, 423. 



Vierordt (K.) on the use of the spec- 

 tral apparatus in the quantitative 

 determination of colouring-matters, 

 482. 



Vincent (C. W.) on the relations of 

 magnetism and static electricity, 

 297, 390. 



Vision, on subaqueous, 350. 



Walenn (W. H.) on the electro-depo- 

 sition of copper and brass, 41. 



Warren (T. T. P. B.) on the estima- 

 tion of zinc on galvanized iron, 

 132. 



Watts (Dr. W. M.) on the spectra of 

 carbon, 12. 



Weinhold (A.) on the inversion of the 

 sodium-line, 404. 



Wheatstone (Sir C.) on successive po- 

 larization of light, 398. 



Winkworthite, on the chemical com- 

 position of, 270. 



Zenger (Prof. K. W.) on the tangent- 

 balance, and its applications, 443. 



Zinc, on the estimation of, on galva- 

 nized iron, 132. 



Zodiacal light, on the, 53, 484. 



Zollner (F.) on the spectrum of the 

 aurora borealis, 122; on the influ- 

 ence of density and temperature on 

 the spectra of incandescent gases, 

 190. 



END OF THE FORTY-FIRST VOLUME. 



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