858 



INDEX. 



Ono (S.) on the amount of the radio- 

 active products present in the 

 atmosphere, 821. 



Optical properties of fused metals, 

 on the, 266. 



Osmotic pressure and vapour pressure 

 of solutions, on, 933. 



Owen (Dr. G.) on the production of 

 nuclei in air by intense cooling, 

 563. 



Peddie (Prof. W.) on the problem 

 of partition of energy, especially 

 in radiation, 663. 



Photoelectric effect, on the difference 

 in the, caused, by incident and 

 emergent light, 854. 



Photographic reproduction, on the 

 general problem of, 734. 



Pianoforte bridges, on the, 113. 



Plate, on the calculation of Chladni's 

 figures for a square, 225. 



Polarization of undifliacted long- 

 waved heat rays by wire gratings, 

 on, 322. 



Positive electricity, on rays of, from 

 the Wehnelt cathode, 926. 



ionization from hot salts, on 



the, 669. 



Prescott (J.) on the rigidity of the 



earth, 481. 

 Pressure, on the internal, of a liquid, 



193. 

 Probability variations in the dis- 

 tribution of a particles, on the, 198. 

 Quadratures, on some new mechani- 

 cal, 342. 

 Quartz, on the phosphorescence of 



fused, 533 ; on the diffusion of 



neon through hot, 704. 

 Radiation, on the intensity of the 



earth's penetrating, at different 



altitudes, 639. 

 Padioactive emanations, on the 



transformation and nomenclature 



of the, 621. 

 ■ equilibrium, on the ratios of 



substances in, 353. 

 ■ products of short life, on, 629 ; 



on the amount of the, present in 



the atmosphere, 821. 

 properties of high temperature 



flames, on the, 805. 



substances, on the relative 



number of ions produced by the 

 /3 particles from the various, 604; 

 on the ranges of the a particles 

 from various, 613. 



Radioactivity, on the calculation of 

 the age of the earth by, 370. 



Radium, on a method of investigating 

 the quantity of, in rocks and 

 minerals, 134 ; on the production 

 of helium by, 586. 



■ B, on the relative number of 



ions produced by the /3 particles 

 from, 604. 



C, on the coefficient of absorp- 

 tion by air of the beta rays from, 

 8 ; on the number of ions produced 

 by the beta rays and by the gamma 

 rays from, 551 ; on the relative 

 number of ions produced by the 

 /3 particles from, 604. 



emanation, on the solubility of, 



840. 



Rastall (R. IT.) on the geology of 

 the districts of Worcester, Robert- 

 son, and Aehton, 466. 



Rayleigh (Lord) on aberration in a 

 dispersive medium, 130; on the 

 calculation of Chladni's figures 

 for a square plate, 225 ; problems 

 in the conduction of heat, 381 ; 

 on the general problem of photo- 

 graphic reproduction, with sugges- 

 tions for enhancing gradation 

 originally iuvisible, 734. 



Reflexion of light, on the, at metal- 

 liquid surfaces, 229 ; on some 

 consequences of Fresnel's theory 

 of the, 005. 



Relativity, on the principle of, 

 222. 



Resistance, on the effect of magnetic 

 fields on metallic, 900. 



Resonance spectra of iodine vapour, 

 on the, 469. 



Richardson (Prof. O. W.) on the 

 positive ionization from hot salts, 

 669 ; on the diffusion of neou 

 through hot quartz, 704. 



Rigidity ot the earth, on the, 481. 



Ring discharge, on the spectra of 

 the electrodeless, in certain gases, 

 720. 



Roberts (D E.) on the induction-coil, 

 706. 



Rocks, on a method of investigating 

 the quantity of radium in, 134. 



Rontgen rad : ation, on the spectra of 

 fluorescent, 3-96 ; on the trans- 

 formation of the energy of homo- 

 geneous, into energy of corpuscular 

 radiation, 447. 



