476 



INDEX. 



Sound, notes on the theory of, 25, 

 125, 216. 



Spectra of chemical compounds, on 

 the, 444. 



Spectroscope, on a new automatic 

 motion for the, 100. 



Spectrum, on the lower limit of the 

 prismatic, 348. 



Spottiswoode (W.) on stratified and 

 unstratified forms of the jar-dis- 

 charge, 231. 



Spratt (Rear-Admiral) on the coal- 

 bearing deposits near Erekli, 74. 



Steel, on certain molecular changes 

 which occur in, during heating and 

 (tooling, 389. 



tubes, on the magnetization of, 



568. 



Stoney (G. J.) on Crookes's force, 

 07 ; on the nature of what is com- 

 monly termed a " vacuum/' 222 ; 

 on the penetration of heat across 

 layers of gas, 424. 



Streintz (H.) on the distribution of 

 temperature in the conducting- 

 wire of a galvanic current, 79. 



Sugiura (S.) on essential oil of sage, 

 336. 



Sulphuric acid, on the exact measure 

 of the heat of solution of, in water, 

 471. 



Sylvester (Prof. J. J.) on a generali- 

 zation of Taylor's theorem, 136. 



Tavlor's theorem, on a generalization 

 of, 136. 



Telegraph receiving-instrument, on 

 the best resistance of a, 449. 



Temperature-coefficients for insula- 

 ting envelopes, on the determina- 

 tion of, 272. 



Terpene from sage-oil, researches on 

 the, 336. 



Thermodynamics, on the application 

 of, to the study of the variations 

 of px)tential energy of liquid sur- 

 faces, 40. 



Thermometers, on the process of veri- 

 fying, at the Kew Observatory,226. 



Thompson (S. P.) on the chromatic 

 aberration of the eye, 48 ; on a 

 curious effect of absorption of light, 

 61 ; on binaural audition, 274. 



Tin, on the disaggregation of, 470. 



Unitation, on, 375. 



Urbanitzki (M.) on some remarkable 

 phenomena in Geissler's tubes, 240. 



Vacuum, on the nature of what is 

 commonly termed a, 110, 122. 



Vapour-densities, on a new method 

 of determining, 462. 



Variable quantities, on fallible mea- 

 sures of, 1. 



Violle (J.) on the specific heat and 

 heat of fusion of platinum, 318. 



Vision, on the effect of chromatic 

 aberration in distant, 239. 



Volcanic cones, on the piliug-up of, 

 151. 



Walenn (W. H.) on Unitation, 375. 



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

 mination of temperature-coeffici- 

 ents for insulating envelopes, 272. 



Wiedemann (Prof. G.) on the mag- 

 netic behaviour of chemical com- 

 pounds, 161, 276. 



Woodward (C. J.) on an apparatus 

 to illustrate the interference of two 

 plane waves, 184. 



Zeolitic and siliceous incrustations, 

 on, 234. 



END OF THE FOURTH VOLUME. 



Priiited by Taylor and Frakcis, Eed Lion Court, Fleet Street. 



