INDEX. 



531 



Iron vapour, on the origin of the 

 line spectrum emitted by, 221. 



Isserlis (Dr. L.) on the variation of 

 • the multiple correlation coeffi- 

 cient in samples drawn from an 

 infinite population with normal 

 distribution, 205. 



Ives (Dr. H. E.) on hue difference 

 and flicker photometer speed, 99. 



J series, on the characteristic radia- 

 tions of, 270. 



Jeffreys (H.) on periodic convection 

 currents in the atmosphere, 112, 

 449. 



Kinetic theory of solutions, on the, 

 158, 521. 



Lead, on the absorption of X rays 

 in, 158. 



Lens-combinations, on the focometry 

 of, 76. 



Light, on the nul point of thin axial 

 pencils of, 174. 



Line-coordinates, on a method of, 

 for investigating the aberrations 

 of a symmetrical optical system, 

 496. 



Liquid, on the pressure developed 

 in a, during the collapse of a 

 spherical cavity, 94. 



Livens (G. H.) on the flux of energy 

 in the electrodynamic field, 385. 



Lodge (Sir O.) on astronomical 

 consequences of the electrical 

 theory of matter, 8.1, 517. 



Magnetism, on the application of 

 van der Waals' equation to, 380. 



Mercury, on the motion of the peri- 

 helion of, 81, 163, 321, 517. 



, on the limiting frequency in 



the spectrum of, in the extreme 

 ultra-violet, 285. 



Metal surfaces, on the colours dif- 

 fusely reflected from collodion 

 films spread on, 423. 



Mica, on the temperature variation 

 of the electrical conductivity of, 

 195. 



Millikan (Prof. R. A.) on a new 

 determination of e, N, and related 

 constants, 1. 



Multiple correlation coefficient, on 



the variation of the, 205. 

 Nul point of thin axial pencils of 

 light, on some properties of the, 

 174. 

 Okano (S.) on the ionizing poten- 

 tial of sodium vapour, 177. 



Optical system, on the nul point of 

 light refracted through a, 174; 

 on a method of line-coordinates 

 for investigating the aberrations 

 of a, 496. 



Organic compounds, on the nature 

 of chemical affinity in the com- 

 bustion of, 66. 



Osmotic equilibrium, on the theory 

 of, 31, 459. 



Pendulums, on double-cord and cord- 

 and-lath, 246. 



Perihelia of certain planets, on the 

 morion of the, 81, 163, 321, 517. 



Periodic law, on the curves of the, 

 70. 



Photometry, notes on colour, 99. 



Physical constants, on a new deter- 

 mination of some, 1. 



Plummer (Prof. H. C.) on the action 

 of coupled circuits and mechanical 

 analogies, 510. 



Poisson's equation, on the failure of, 

 for certain volume distributions, 

 138. 



van der Pol (Dr. B 3 ) on the audibility 

 factor of a shunted telephone, 

 184. 



Poole (H. H.) on the temperature 

 variation of the electrical conduc- 

 tivity of mica, 195. 



Population, on the variation of the 

 multiple correlation coefficient in 

 samples drawn from an infinite, 

 with normal distribution, 205. 



Prasad (Prof. G.) on the failure of 

 Poisson's equation for certain 

 volume distributions, 138. 



Prescott (J.) on the motion of a 

 spinning projectile, 332. 



Projectile, on the motion of a spin- 

 ning, 332. 



Radium, on the distribution of the 

 active deposit of, in an electric 

 field, 429. 



Raman (Prof. C. V.) on the main- 

 tenance of vibrations by a periodic 

 field of force, 129. 



Ratner (S.) on the distribution of 

 the active deposit of radium in an 

 electric field, 429. 



Rayleigh (Lord) on the pressure 

 developed in a liquid during the 

 collapse of a spherical cavity, 94 ; 

 on the colours diffusely reflected 

 from some collodion films spread 

 on metal surfaces, 423. 



