INDEX. 



731 



Searle (G. F. C.) on a simple 

 rheostat, 173. 



Seismopfraras, on the interpretatiou 

 of Mihie, 401. 



Shimizu (S.) on change of len<^th of 

 ferromagnetic substances by mag- 

 netization, 392. 



Shrubsole (0. A.) on the Budleigh- 

 Salterton pebble-beds, 547. 



Silicic acid, on the Tiscosity and 

 composition of solutions of, 376. 



Simpson (G. C.) on charging through 

 ion absorption and the earth's 

 permanent negative charge, 589. 



Sodium vapour, ou the fluorescence 

 and absorption spectra of, 362. 



Sollas (Prof. W. J.) on the figure of 

 the earth, 3b2. 



Solubility, on the mutual, of liquids, 

 637. 



Sound, on the production and dis- 

 tribution of, 289. 



Sowter (R. J.) on astigmatic aber- 

 ration, 524. 



Sparking potential, theory of the, 

 598. 



Spectra of gases and metals at high 

 temperatures, on the, 58 ; ou the 

 fluorescence and absorption, of 

 sodium vapour, 362 ,• on the effect 

 of pressure upon arc, 569 ; on the 

 relationship between, and atomic 

 weights, 698. 



Spectral lines, on unsymmetrical 

 broadening of, 536. 



Spectroscope, on a direct-vision, of 

 one kind of glass, 268. 



Spectrum photographs, on photo- 

 graphic reversals in, 577. 



Spheres in a viscous fluid, on the 

 distribution of pressure around, 

 424. 



Stark (Dr. J.) ou the theory of ioni- 

 zation by collision of ions with 

 neutral molecules, 116. 



Steele (Dr. B. D.) on the vapour-den- 

 sities of some carbon compounds, 

 492. 



Stiffness, on the influence of, on the 

 form of a suspended wire or tape, 

 166. 



Stopcock, on a new form of vacuum, 

 78. 



Stroud (Prof W.) on the application 

 of alternating currents to the 

 calibration of capacity-boxes, 707. 



Strutt (Hon. R. J.) on the absorption 

 of light by mercury and its vapour, 

 76 ; on a radioactive gas from 

 metallic mercury, 113; on the 

 fluorescence of crystals under the 

 Rontgen raj'^s, 250 ; on the loss of 

 negative electricity by radium, 

 588. 



Surveyor's tape, on the influence of 

 stiffness on the form of a, 166. 



Temperature, on the practical attain- 

 ment of the thermodynamic scale 

 of, 353. 



Thermal conductivity, on the influ- 

 ence of magnetic field on, 725. 



Thermodynamic scale of temperature, 

 on the practical attainment of the, 

 353. 



Thermoelectric work, on a direct- 

 reading potentiometer for, 41. 



Thermometer, on a new form of 

 platinum resistance, 350. 



Thomson (Prof J. J.) on the mag- 

 netic properties of systems of cor- 

 puscles describing circular orbits, 

 673. 



Tie-bars, on an instrument for mea- 

 suring the lateral contraction of, 

 417. 



Toluene, on the dispersion of. 111 ; 

 on the vapour-density of, 492. 



Townsend (Prof. J. S.) on ionization 

 produced by the motion of positive 

 and negative ions, 358 ; on the 

 genesis of ions by the motion of 

 positive ions in a gas, 598. 



Trowbridge (Prof. J.) on the spectra 

 of gases and metals at high tem- 

 peratures, 58. 



Trumpet, on the theory of the 

 conical, 289. 



Vacuum-pump, on an automatic 

 mercury, 316. 



Vapour-densities of some carbon 

 compounds, on the, 492. 



Vaughan (A.) on the Lower Lias at 

 Sedbury Cliff', 636. 



Veley (Dr. V. H._) on initial accele- 

 ration in chemical change, 271. 



Vibrations set up in molecules by 

 collisions, on the, 279; on the 

 impossibility of undamped, in an 

 unbounded dielectric, 667. 



Viscous fluid, on the distribution 

 of pressure around spheres in a, 

 424. 



