INDEX. 



90: 



Poole (H. H.) on the thermal con- 

 ductivity of some rocks at high 

 temperatures, 45. 



Positive rays, experiments on, 200. 



Potential measurements in the 

 neighbourhood of the electrodes 

 in point-plane discharge, on, 608. 



Pound (V. E.) on the secondary rays 

 excited by the a rays of polonium, 

 401. 



Quadrant electrometer, on the 

 motion of the needle of a, 445. 



Radiation, on the relative intensities 

 of the earth's penetrating, on land 

 and sea, 520; on the secondary 

 Rontgen, from carbon, 765. 



Radioactive elements, on chemical 

 compounds of short-lived, 125. 



substances, on the origin of 



beta and gamma rays from, 453. 



Radioactivity, on the, of terrestrial 

 surface materials, 694. 



Radium, on the y rays excited by 

 the j3 rays of, 594, 892; on the 

 energy of the /3 rays from, 893. 



C, on the volatility of, 1^4. 



emanation, on the supply of, 



from the soil to the atmosphere, 

 632. 



Raman (C. V.) on the maintenance 

 of forced oscillations of a new 

 type, 513. 



Rayleigh (Lord) on coloured photo- 

 n.etry, 301; on some iridescent 

 films, 751 ; remarks concerning 

 Fourier's theorem as applied to 

 physical problems, 864. 



Recoil atoms in ionized air, on, 722. 



Rectangular galvanometer, on the 

 construction and constants of a, 

 788. 



Rectilinear diameter, applications of 

 the law of the, 415. 



Refractive index of liquids in con- 

 tact, on densit}' and, 451. 



Relativity, on the quaternionic form 

 of, 208 ; on uniform rotation and 

 the principle of, 820. 



Resistance, on the effect of magnetic 

 fields on, 813. 



measurements, on new bridge 



methods for, 541. 

 Resonance spectra of iodine by 

 multiplex excitation, on the, 673. 

 Reynolds (Prof. S. H.) on the ordo- 

 vician and silurian rocks of the 

 Kilbride Peninsula, 811. 



Richardson (Prof. O. W.) on the 

 theory of photoelectric action, 570; 

 on the photoelectric effect, 575 ; 

 on the electron theory of thermo- 

 electric and thermionic effects, 

 737 ; corrections to paper on the 

 electron theory of matter, 812. 



Rieman (E. G.) on magnetic rays, 

 307. 



Righi (Prof. A.) on magnetic rays 

 in different gases, 804. 



Rocks, on the thermal conductivity 

 of some, at high temperatures, 45 



Romanes (J.) on the geology of 

 Costa Rica, 324. 



Rontgen radiation from substances 

 of low atomic weight, on the, 138; 

 on the secondary, from carbon, 765. 



rays, on the asymmetry in the 



distribution of secondary cathode 

 rays produced by, 37 ; comparison 

 of the ionization due to, and 

 gamma rays, 432. 



Rotation, on uniform, and the 

 principle of relativity, 820. 



Ruler for drawing curves, on a, 661. 



Rupture, on breaking tests under 

 hydrostatic pressure and condi- 

 tions of, 63. 



Russell (A. S.) on the volatility of 

 radium C, 134. 



Rutherford (Prof. E.) on the origin 

 of /3 and y rays from radioactive 

 substances, 453, 893; on the photo- 

 graphic registration of a particles, 

 618. 



Sadler (C. A.) on the Rontgen 

 radiation from substances of low 

 atomic weight, 138. 



Schrader (H.) on the existence of 

 chemical compounds of short- 

 lived radioactive elements, 125. 



Scrivenor (J. B.) on the Gopeng 

 beds of Kinta, 204. 



Sherlock (Dr. R. L.) on the glacial 

 origin of the clay-with-flints of 

 Buckinghamshire, 898. 



Shorter (S. A.) on the elasticit}' of 

 liquid films, 629. 



Sibly (Dr. T. F.) on the faulted 

 inlier of carboniferous limestone 

 at Upper Yobster, 206. 



Smith (B.) on the glaciation of the 

 Black Combe district, 899. 



Smith (F. E.) on bridge methods 

 for resistance measurements in 

 platinum thermometry, 541. 



