INDEX. 



519 



Photographic pictures, on an optical 

 device for the intensification of, 

 282. 

 Platinum temperatures, on, 445. 



Pressure, on the effect of, upon the 

 series in the spectrum of an ele- 

 ment, 119; on the decomposition 

 of silver salts by, 172 ; on the 

 measurement of small gaseous, 415. 



Price (W. A.) on alternating currents 

 in concentric cables, Gl . 



Pulverized bodies, on heat produced 

 by moistening, 205. 



Quincke (G.) on the viscosity of in- 

 sulatiug liquids in a constant 

 electrical held, 444. 



Radiation in a magnetic field, on, 

 109. 



radiometer motion, on, 52. 



Raisin (Miss C. A.) on the petrology 

 of the Nubian desert, 125. 



Rayleigh (Lord) on the incidence of 

 aerial and electric waves upon 

 small obstacles in the form of 

 ellipsoids or elliptic cylinders, and 

 on the passage of electric waves 

 through a circular aperture in a 

 conducting screen, 28 ; on the pro- 

 pagation of electric waves along 

 cylindrical conductors, 199 ; on an 

 optical device for the intensifica- 

 tion of photographic pictures, 282; 

 on the propagation of waves along 

 connected systems of similar 

 bodies, 350. 



Reflexion at the surface of highly 

 absorbing media, on change of 

 phase on, 349. 



Refraction in liquids, on accidental 

 double, 499. 



Revnolds (S. H.) on the Portraine 

 i'nlier, 132. 



Richards (E. P.) on the gravels of 

 Newbury, 126. 



Rings, on the external field of heli- 

 cally magnetized, 513. 



Rontgen radiation, on the absorption 

 of, 401 ; on the velocity and rate 

 of recombination of the ions of 

 gases exposed to, 422. 



Rose-Innes (J.) on the isothermals 

 of isopentane, 76. 



Rotations, on the optical efficiency 

 of methods for observing small, 83. 



Rowland's mercury thermometers, 

 comparison of, with a Griffiths 

 platiuum thermometer, 165. 



value of the mechanical equi- 

 valent of heat, recalculation of, in 



terms of the Paris hydrogen ther- 

 mometer, 169. 

 Rutherford (E.) on the velocity and 

 rate of recombination of the ioDS 

 of gases exposed to Rontgen 

 radiation, 422. 

 Saunders (F. A.) on the energy spec- 

 trum of a black body, 136. 

 Searle (G. F. C.) on the steady 

 motion of an electrified ellipsoid, 

 329. 

 Silver salts, on the decomposition of, 



by pressure, 172. 

 Solutions, on the surface-tension of 

 dilute aqueous, 134, 369 ; on the 

 laws of dilute, 493. 

 Solvents, on the ionizing power of, 1. 

 Spectrum, on doublets and triplets 

 in the, produced by external mag- 

 netic forces, 55, 109, 255, 503 ; of 

 an element, on the effect of pres- 

 sure upon the series in the, 119; 

 on the energy-, of a black body, 136. 

 Steel, on the secular softening of 



cold hard, 486. 

 Stoney (Dr. G. J.) on proofs of a 

 theorem in wave-motion, 98, 206. 

 Stroud (Prof. W.) on the measure- 

 ment of electrotytic conductivity 

 by continuous currents, 133. 

 Surface-tension of dilute aqueous 



solutions, on the, 134, 369. 

 Sutherland (W.) on thermal tran- 

 spiration and radiometer motion, 

 52 ; on the causes of osmotic 

 pressure and the laws of dilute 

 solutions, 493. 

 Teall (J. J. II.) on a collection of 

 rocks and fossils from Franz Josef 

 Land, 442. 

 Telephone, on a nickel stress, 26, 211. 

 Temperature, on the changes in the 

 magnetic properties and electrical 

 resistance of iron with, 213. 

 Temperatures, on platinum, 445. 

 Thermal transpiration, on, 52. 

 Thermometers, on an instrument for 

 the comparison of, 116 ; compari- 

 son of Rowland's mercury, with a 

 Griffiths platinum thermometer, 

 165. 

 Thomson (Prof. J. J.) on cathode 



rays, 293. 

 Trowbridge (Prof. J.) on the oscil- 

 latory discharge of a large accu- 

 mulator, 259 ; on electrical dis- 

 charges in air, 285. 

 Uranium, on the electrification of 

 air by, 102. 



