INDEX. 



731 



Solid, on the heat evolved or ab- 

 sorbed when a liquid is brought 

 in contact with a finelv-divided, 

 240. 



Sollas (Prof. W. J.) on a process for 

 the mineral analysis of rocks, 417. 



Solubility, on the theory of. 275. 



Solutions, on nuclei produced by 

 shaking, 262. 



Spark-gap, on a high-pressure, 224. 



Spectra arising from the dissociation 

 of water vapour and the presence 

 of dark lines in gaseous, on, 156. 



Spectrum, on the effect of the pre- 

 sence of hydrogen on the lines of 

 the carbon, 202 ; on uneven dis- 

 tribution of light in a, 396; on 

 reversal of lines in a, 606. 



Steart (F. A.) on overthrusts in the 

 Braysdown colliery, 520. 



Steel, on the magnetostriction of, 

 45 ; on the change of rigidity of, 

 by magnetization, 543. 



Stevenson (J.) on the chemical and 

 geological history of the atmo- 

 sphere, 435. 



Stoney (Dr. G-. J.) on the law of 

 atomic weights, 411, 504. 



Strahan (A.) on the origin of the 

 river-system of South Wales, 421. 



Straubel (R.) on the electro-thermal 

 effect in tourmaline, 220. 



Stretch modulus, on the measure- 

 ment of the, 402. 



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

 of positive electrification by hot 

 metals, 98 ; on the electrical con- 

 ductivity of metals and their 

 vapours, 596. 



Sutherland (W-) on the electric 

 origin of molecular attraction, 625. 



Temperatures, on the steady, of a 

 thin rod, 226. 



6, on a method of obtaining, from 

 the hyperbolic trigonometrical 

 functions of, 238. 



Thomas (H. H.) on the Bunter 

 pebble-bed in the West of Eng- 

 land, 518. 



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

 sion of negatively charged corpus- 

 cles by hot bodies, 253 ; on induced 

 radioactivity in air, and on the 

 electrical conductivity produced 

 in gases when they pass through 

 water, 352. 



Thorium compounds, on radioactivity 

 due to, 16 ; on deviable rays from, 

 319 ; on active products separated 

 from, 322 ; on the radioactivity of, 

 370, 569. 



Thorium X, on, 370, 569. 



Tourmaline, on the electro-thermal 

 effect in, 220. 



Trowbridge (Prof. J.) on spectra 

 arising from the dissociation of 

 water vapour and the presence 

 of dark lines in gaseous spectra, 

 156. 



Uranium, on active products sepa- 

 rated from, 322. 



rays, action of a magnetic field 



on, 2. 



Vacuum-tube discharge, on the drop 

 of potential at the electrodes in, 

 490. 



Vapour-density of metallic vapours, 

 on a method of determining the, 

 546. 



pressure, on mixtures with 



maximum or minimum, 116 ; on 

 the theory of, 270. 



-temperatures at equal pres- 

 sures, on the comparison of, 

 ^ 335. 



Vapours, on a method of determining 

 the vapour-density of metallic, 

 546 ; on the electrical conductivity 

 of metallic, 596. 



Vibration of ferromagnetic wires in 

 a varying magnetizing field, on 

 the, 645. 



Vincent (Dr. J. H.) on 



numerical connexion between the 

 atomic weights, 103. 



Voigt (Prof. W.) on the behaviour 

 of pleochroitic crystals along direc- 

 tions in the neighbourhood of an 

 optic axis, 90. 



Walford (E. A.) on some gaps in the 

 Lias, 420. 



Water, on the ebullition of rotating, 

 330 ; on the electrical conduc- 

 tivity produced in gases when 

 they pass through, 352. 



Water-particles, on the sizes of, pro- 

 ducing colours in cloudy condensa- 

 tion, 24. 



vapour, on spectra arising from 



the dissociation of 156. 



Wave-propagation in crystals, on, 

 90. 



general 



