I N D E X. 



831 



Platinum, on the nuclear charge of, 



742. 

 van der Pol (Dr. B., jr.) on the 



propagation of electromagnetic 



waves round the earth, 163. 

 Polarization, on rotation of the plane 



of, due to the scattering of light 



by electrons, 713. 

 Poles of an arc, on the pressure on 



the, 511. 780. 

 Poole (Dr. II. II.) on the use of 



vector methods in the derivation 



of formulae used in inductance 



and capacity measurements, 793. 

 Poole (J. H. J.) on the radium con- 

 tent of the rocks of the Loetsch- 



berg tunnel, 466. 

 Porter (Prof. A. W.) on the specific 



heat of saturated vapours and 



entropy-temperature diagrams of 



fluids, 211. 

 Potassium in the sun, on, 813. 

 Potentials due to electric charges, on 



the scalar and vector, 228. 

 Precipitation of colloids, on the, 



578. 

 Prescott (Dr. J.) on the torsion of 



closed and open tubes, 521. 

 Probabilities, on the application of, 



to the movement of gas-molecules, 



249. 

 Projective theorem in optics, on a, 



113. 

 Quantum theory, on Rydberg's law 



and the, 619. 

 Radiation from a cylindrical wall, 



on, 111. 

 Radiations, on an electrical method 



for the measurement of recoil, 



763. 

 Radium, on the relative activity of, 



and actinium, 50. 

 content of the rocks of the 



Loetediberg tunnel, on the, 466. 

 Rankine (Prof. A. 0.) on the dimen- 

 sions of atoms, 516. 

 Ratner (S.) on the pressure on the 



poles of an electric arc, 511 ; on 



the discharge of electricity through 



rarefied gases. 785. 

 Reactions, on the velocity of uni- 



molecular, 461. 

 Recoil radiations, on an electrical 



method for the measurement of, 



763. 

 Refraction, on, due to the scattering 



of light by electrons, 713. 



Relativity, on a new reading of, 31 ; 

 on the bearing of rotation on, 67 ; 

 on the parabolic trajectory and 

 the theory of, 674. 



Resonance potentials for electrons in 

 lead and calcium, on, 73. 



Richardson (Prof. A. R.) on sta- 

 tionary waves in water, 97. 



Rideal (Prof. E. K.) on the velocity 

 of unimolecular reactions, 461. 



Ring-electron, on optical rotation 

 and the, 426. 



Rocks, on the radium content of, 

 466; on the closure of small 

 cavities in, 681. 



Rotation, on the bearing of, on rela- 

 tivity, 67. 



Rubidium in the sun, on, 814. 



Rydberg's law, on, 619. 



Ryde (J. W. H.) on the disappear- 

 ance of gas in the electric dis- 

 chaige, 585. 



Saha (Dr. M. N.) on the secondary 

 spectrum of hydrogen, 159 ; on 

 ionization in the solar chromo- 

 sphere, 472 ; on elements in the 

 sun, 809. 



Sampson (Prof. R. A.) on the bearing 

 of rotation on relativity, 67. 



Shand (Prof. S. J.) on a rift-valley in 

 W. Persia, 247. 



Shaver (W. W.) on the permeability 

 of thin fabrics and films to hydro- 

 gen and helium, 272. 



Silicon, on the mass-spectrum of, 

 628. 



Silver, on the nuclear charge of, 743. 



Similitude, on convection of heat 

 and, 692. 



Slate (Prof. F.) on a new reading of 

 relativity, 31. 



Sodium in the sun, on, 812. 



Solar chromosphere, on ionization in 

 the, 472. 



Solenoid, on a double, for the pro- 

 duction of uniform magnetic fields, 

 519. 



Space-time manifolds and gravita- 

 tional fields, on, 703. 



Specific heat of a gas, on the varia- 

 tion of the, with temperature, 357. 



Spectra of the vapours of magnesium, 

 copper, and manganese, on the, 

 296 ; on the series constants of the, 

 of hydrogen and helium, 489; on 

 the mass-, of chemical elements, 

 628. 



