INDEX. 



823 



Polarization of light, on anomalous 

 dispersion of the magnetic rotation 

 of the plane of, 725. 



Potential of the electrodes in 

 stationary liquids, on the mea- 

 surement of the, -0 : variation of 

 the, required to maintain a current 

 in a gas, 289 ; on aeolotropic, 

 4-25. 



Poynting (Prof. J. H.) on the tan- 

 gential stress due to light incident 

 obliquely on an absorbing sur- 

 face, 169 ; on radiation pressure, 

 393. 



Kadiation, on secondary, 230; od, 

 and electromagnetic theory, 313, 

 425 .; on the intensity of the solar, 

 over the northern hemisphere, 

 351 : on the, from ordinary ma- 

 terials, 531. 



Radiation pressure, on, 393. 



Radioactivity of mineral springs, on 

 the, 148 ; and chemical change, 

 on, 545; on the excited, of thorium, 

 628. 



Radium, on the secondary radiation 

 produced by the primary radiation 

 from, 230 ; action of. on the 

 electric spark, 378 ; on the origin 

 599 ; on the heating effect of 

 y rays from, 621 ; on the properties 

 in minute quantities, 708 ; on 

 the production of, from uranium, 



Radium emanation, on the molecular 

 weight of, 56. 



Rayleigh (Lord) on the pressure of 

 MB and the equation of virial, 

 4! i4 ; on an optical paradox, 779. 

 -:ance-thermometers, on direct- 

 reading, 713. 



Richardson (L.) on the rhaetic rocks 

 t Monmouthshire. el8. 



Richardson (Dr. O. W.) on the dis- 

 charge of electricity from hot 

 platinum in phosphorus vapour, 

 4<J7. 



Rutherford (Prof. E.) on the heating 

 effect of the y rays from radium, 

 021 ; on the radioactivity of weak- 

 radium solutions, 711. 



Sand (Dr. H. J. S.J on the measure- 

 ment of the potential of the 

 electrodes in stationarv liquids, 



Sarrut, on the parallel motion of, 



Searle (G. F. C.) on a method of 

 determining the thermal conducti- 

 vity of copper, 125. 



Sebelien (Prof. J.) on the distribu- 

 tion of actinic sunlight on the 

 northern hemisphere at summer 

 solstice, 351. 



Secondary radiation, on, 230. 



Skeats (Dr. E. W.) on the origin of 

 the dolomites of Southern Tyrol, 

 287. * ' 



Slater (Miss J. M.W.) on the excited 

 activity of thorium, 628. 



Soddy (F.) on the production of 

 radium from uranium, 768. 



Spark-discharges, on short, 692. 



Spicer (Rev. E. C.) on sarsen-stones 

 in a clay-pit, 286. 



Springs, on the radioactivity of, 

 148. 



Stevenson (J.) on the chemical and 

 geological history of the atmo- 

 sphere, 88. 



Stoney (Dr. G. J.) on the escape of 

 gases from atmospheres, 510 ; on 

 flat-wavelet resolution, 577. 



Stress theory, on Maxwell's, 491. 



Sumpner (Dr. W. E.) on the mea- 

 surement of small differences of 

 phase, 155. 



Sunlight, on the distribution of 

 actinic, on the northern hemi- 

 sphere, 351. 



Sutherland (W.) on a dynamical 

 theory of diffusion for non-electro- 

 lytes and the molecular mass of 

 albumin, 781 . 



Thermal conductivity- of copper, on 

 the, 125. 



Thermocouples, on composite, 720. 



Thermodynamics, on difficulties en- 

 countered in the study of, 208. 



Thermometers, on direct - reading 

 resistance-, 713. 



Thorium, on the excited activity of, 

 628. 



Thorium emanation, on the molecular 

 weight of, 56. 



Tinfoil, on the radiation from, 531. 



Townsend (Prof. J. S.) on the 

 variation of the potential required 

 to maintain a current in a gas, 

 289. 



Transformers, on the application of 

 the cymometer to the determina- 

 tion of the coefficient of coupling 

 of oscillation-, 758. 



