'68 



INDEX. 



Rutherford (Prof. E.) on the velocity 

 and energy of the a particles from 

 radioactive substances, 110. 



Salts, on electrical conductivity pro- 

 duced by heating, 728. 



Saturation constants according to 

 van der Waals's equation, on the, 

 517. 



Schott (G. A.) on the electron theory 

 of matter and on radiation, 189; 

 on the radiation from moving 

 systems of electrons and on the 

 spectrum of canal rays, 657. 



Searle (G-. E. C.) on the impulsive 

 motion of electrified systems, 118, 

 288. 



Shaw (Dr. P. E.) on spark potentials 

 in liquid dielectrics, 277. 



Singing* flames, on the mutual re- 

 action of, 323. 



Siren, on a tuning-fork, and its regu- 

 lation, 329. 



Solutions, contributions to the theory 

 of, 589. 



Sound direction, on our perception 

 of, 214. 



Sound-waves, on the appreciation of 

 difference of phase of, 452. 



Specific heats, on the variation of, 

 with temperature and densit} r , 

 525 ; on the, of saturated vapours, 

 536. 



Spectrophotometer, on improvements 

 in the Hiifner type of; 481. 



Spectrum of canal rays, on the, 657. 



Speed regulation, on stroboscopic, 

 330. 



Steel, on the recovery of, from over- 

 strain, 688. 



Stress, on the influence of, on the 

 conductivity of metals, 635. 



Stroboscopic speed regulation, on,330. 



Sunspot and auroral frequencies, on ; 

 149. 



Surface concentration, on, 96. 



Telephones, sensations of right and 

 left from a revolving magnet and, 

 316. 



Terada (T.) on the change of elastic 

 constants of ferromagnetic sub- 

 stances by magnetization, 36. 



Thermodynamical theory of radia- 

 tion, on the, 285. 



Thomson (Prof. J. J.) on rays of 

 positive electricity, 561. 



Transformer indicator diagrams, on, 

 468. 



Trouton (Prof. E. T.) on the rate of 

 recovery of residual charge in con- 

 densers, 578. 



Tungsten-steel, on the change of 

 elasticity of, by magnetization, 

 47. 



Tuning-forks with slight mutual 

 influence, on, 322; on longitudinal 

 balance of, 325. 



Twyman (E.) on improvements in 

 the Hiifner type of spectrophoto- 

 meter, 481. 



Vapours, on the specific heat of satu- 

 rated, 536 ; on the isopiestic tem- 

 peratures of saturated, 724. 



Vegard (L.) on the theory of solu- 

 tions, 589. 



Vibrations, on simultaneous, of string 

 and bridge obtained from a mono- 

 chord, 446. 



Washington (Dr. H. S.) on the titani- 

 ferous basalts of the Western 

 Mediterranean, 288. 



Water-vapour, on the decomposition 

 of, in contact with hot platinum 

 wire, 630. 



Waves, on the initiation of deep-sea, 

 1 ; on the appreciation of difference 

 of phase of sound-, 452. 



Williams (W. E.) on the influence 

 of stress on the conductivity of 

 metals. 635. 



Wood (Dr. A.) on the diurnal perio- 

 dicity of the spontaneous ionization 

 of air and other gases, 265. 



Young (F. B.) on the field at the 

 point of an electrified needle, 542. 



Zinc, on the fatigue of, subjected to 

 Rontgen radiation, 708. 



END OF THE THIRTEENTH VOLUME. 



Printed by Taylor and Francis, Eed Lion Court, Fleet Street. 



