﻿1006 



IXDE X. 



O'Connor (Miss E.) on the spectrum 

 of the magnesium high-frequency 

 arc, 94. 



Opalescence of gases in the critical 

 state, on, 165. 



Orangite, on the rate of evolution of 

 heat by, 183. 



Osmotic pressure, on the vapour- 

 pressure theory of, 486. 



Owen (Dr. G.) on the effect of 

 clouds on ionization, 352. 



Parker (A.) on the ionization 

 produced by carbon at high 

 temperatures, 192. 



Photoelectric fatigue, on, 255 ; 

 properties of thin metal films, on 

 the, 542 ; phenomena, on, 615. 



Pidduck (F. B.) on ionization by 

 collision in helium, 837. 



Polarized light, on the investigation 

 of stresses by means of, 1. 



Polonium, on the number of ions 

 produced by an a particle from, 

 670 ; on the secondary rays excited 

 by the alpha rays from, 813. 



Pomeroy (J. C.) on the charges on 

 thermions produced in air and 

 hvdrogen at atmospheric pressure, 

 1*73. 



Poole (II. IT.) on the rate of evolution 

 of heat by orangite, 183. 



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

 of liquids, 458. 



Potential, on the application of the 

 theory of chemical, to the ther mo- 

 dynamical theory of solutions, 

 483 ; on contact difference of, and 

 the velocities of electrons, 579. 



Pound (V. E.) on the secondary rays 

 excited by the alpha rays from 

 polonium, 813. 



Pring (Dr. J. N.) on the ionization 

 produced by carbon at high tem- 

 peratures, 192. 



Quadrant electrometer, on the, 380. 



Quartz, on the thermal expansion 

 of, 653. 



Quaternionic form of relativity, on 

 the, 790. 



Radiation, on the cosine law of, 

 237 ; on the emission and absorp- 

 tion of, 513. 



Radioactive bodies, on the electro- 

 chemistry of, 628 ; on the relation 

 between the ranges of a particles 

 and the periods of transformation 

 of, 981. 



Eadioactivitv, on the, of the rocks 

 of the St'Gothard tunnel, 201 ; 

 on absorption problems in, 242. 



Radium, on the distribution of the 

 active deposit of, in an electric 

 field, 714. 



A, on y radiation from, 302. 



C, on the growth of, from 



radium B, 292. 



■ content of secondary rocks, on 



the, 279. 



Ramsauer (Dr. C.) on the production 

 of condensation nuclei in air and 

 in vapours by intense cooling and 

 by ultraviolet light, 849. 



Rayleigh (Lord) on departures from 

 Fresnel's laws of reflexion, 431. 



Reflexion, on departures from 

 Fresnel's laws of, 4i$l ; on selective, 

 by resonating gas molecules, 689. 



Reinganum (Prof. M.) on a relation 

 between the atomic volume and 

 spectra of elements, 336. 



Relativity, on a new approach to 

 the theory of, 494 ; on the quater- 

 nionic form of, 790. 



Richardson (Prof. O. W.*) on the 

 electron theory of contact electro- 

 motive force and thermoelectricity, 

 263 ; on some applications of the 

 electron theory of matter, 594. 



Roberts (J. H. T.) on a method of 

 investigating the transpiration of 

 gases through tubes, 250 ; on the 

 effect of clouds on ionization, 352 ; 

 on the instability of gaseous jets, 

 368 ; on transverse vibrations of 

 a string maintained by forces of 

 double frequency, 931. 



Robinson (Dr. J.) on photoelectric 

 fatigue, 255 ; on photoelectric pro- 

 perties of thin metal films, 542. 



Rocks, on the radioactivity of the, 

 of the St, Gothard tunnel, 201 ; 

 on the radium content of 

 secondary, 279. 



Rontgen rays, on the variation with 

 distance of the ionization produced 

 by, 114 ; on ionization in gaseous 

 mixtures by, 317 : on the nature 

 of the ionization by, 647 ; on the 

 absorption of, in air, 683 ; on the 

 absorption of, and fluorescent 

 spectra of, 987. 

 Rotation, on the effects of the 

 diurnal, on the upper atmosphere, 

 664. 



