I X D E X. 



1015 



Refraction by 11011 - homogeneous 



media, experiments on, 712. 

 Relativity, on the problem of uni- 

 form rotation treated on the 

 principle of, 92. 

 Richardson (Prof. 0. W.) on the 

 heat developed during the absorp- 

 tion of electrons by platinum, 173 ; 

 on the specific charge of the ions 

 emitted by hot bodies, 545 : on the 

 positive thermions emitted b} r the 

 alkali sulphates, 981 ; on the posi- 

 tive thermions emitted by the salts 

 of the alkali metals, 999. 

 Roberts (I). E.) on musical arc oscil- 

 lations in coupled circuits, 660. 

 Rocks, on the radioactivity of the, 

 of the Transandine tunnel, 36 ; on 

 the amount of thorium in sedi- 

 mentary, 125, 353. 



Rontg-en radiations, on the pro- 

 duction of cathode particles by, 

 320. 



Rotation, on the problem of uniform, 

 treated on the principle of relati- 

 vity, 92. 



Russ (Dr. S.) on the deflexion by an 

 electrostatic field of radium B on 

 recoil from radium A, 875. 



Russell (Dr. A.) on the convection 

 of heat from a body cooled by a 

 stream of fluid, 591. 



Rutherford (Prof. E.) on the number 

 of a particles emitted by uranium 

 and thorium and by uranium 

 minerals, 691 ; on the probability 

 variations in the distribution of 

 a particles, 698. 



Satterly (J.) on the amount of radium 

 emanation in the lower regions of 

 the atmosphere, 1 ; on the absorp- 

 tion of radium emanation by coco- 

 nut charcoal, 778. 



Siegbahn (M.) on the study of vari- 

 able currents by means of the 

 pha'seograph, 969. 



Silica, on the expansion and thermal 

 hysteresis of fused, 718. 



Silver, on the specific charge of the 

 ions emitted by hot, 548. 



Slater (Miss I. L.) on geology of 

 district around Llansawel, 1005. 



Smart (E. II.) on a formula for the 

 spherical aberration in a lens- 

 svstem, 82. 



Smith (Dr. S. W. J.) on the Weston 

 cell as a standard of electromotive 

 force, 206. 



Soddy (F.) on the relation between 

 uranium and radium, 340 ; on the 

 rays and product of uranium X, 

 342 ; on the ratio between ura- 

 nium and radium in minerals, 345 ; 

 on the homogeneity of the y rays 

 of radium, 383. 



Sounding-board, on the pianoforte, 

 652. 



Sound-waves, on the clinging of, to 

 concave surfaces, 1001. 



Spark, on a new radiant emission 

 from the, 707. 



Spectra, on the emission-, of aro- 

 matic compounds, 619. 



Spectrometer, on a vacuum, 768. 



Spectrum, on the series, of mercury, 

 (j'oi5; on displacements in the, due 

 to pressure, 788. 



Sphere, on the bending of electric 

 waves round a large, 157 ; on the 

 effect of radial forces in opposing 

 the distortion of an elastic, 437, 

 443 ; on the accelerated motion of 

 an electrified, 610 ; on the accele- 

 rated motion of a dielectric, 828. 



Spherical aberration in a lens-system, 

 on a formula for the, 826. 



trigonometry, on pendulum 



motion and, 728. 



Stead (G.) on the problem of uniform 

 rotation treated on the principle 

 of relativity, 92. 



Steam-pipes, on the lagging of, 518. 



Steel, on the specific charge of the 

 ions emitted by hot, 556. 



Stephenson (A.) on displacements in 

 the spectrum due to pressure, 788 - T 

 on the intensity of periodic fields 

 of force, 844. 



Story (Prof. W\ E.) on partial pres- 

 sures in liquid mixtures, 97. 



Stress, on the optical determination 

 of, 740. 



Stuhlmann (O., jr.) on a difference 

 in photoelectric effect caused by 

 incident and emergent light, 331. 



Sulphates of the alkali metals, on the 

 positive thermions emitted by the 

 981. 

 Sumpner (Dr. W. E.) on a galvano- 

 meter for alternate current cir- 

 cuits, 309. 

 Surface forces, on the theory of, 135. 

 Sutherland (W.) on molecular and 

 electronic potential energy, 249 ; 

 on the mechanical vibration of 

 atoms, 657. 



