576 



I X D E X. 



films of indiarubber, 220 ; on the 

 law of reciprocity in diffuse re- 

 flexion, 324 j on the law of com- 

 plete radiation, 539. 



Reflexion of light on mitt surfaces, 

 photometry of the diffuse, 199 : 

 on the, at the boundary of crystals, 

 237 ; on the law of reciprocity in 

 diffuse, 324. 



Refraction in crystalline media, on, 

 237, 2152. 



Resistance, on the influence of proxi- 

 mity of mass upon electrical con- 

 duction-, 558. 



Reversibility of certain processes, on 

 the, 475 ; of voltaic cells, on the, 

 491. 



Richardson (Dr. S. W.) on the mag- 

 netic properties of the alloys of 

 iron and aluminium, 121. 



Rontgen rays, on the chemical action 

 of the, 244; on the conductivity 

 of helium under, 302. 



Rutherford (Prof. E.) on a radio- 

 active substance emitted from 

 thorium compounds, 1 ; on radio- 

 activity produced in substances by 

 the action of thorium compounds, 

 161. 



Searle (G. F. 0.) on the elasticity of 

 wires, 193. 



Solomon (M.) on the damping of 

 galvanometer-needles, 559. 



Sulution-pressure. on the theory of, 

 417. 



Solutions, on the viscosity of, 274. 



Spectroscope, on the echelon, 384, 

 503, 



Spiers (F. S.) on contact electricity, 

 70. 



Stars, on an interference method of 

 measuring the diameters of, 503. 



Steel ovoids, on the change of volume 

 and length in, bv magnetization, 

 329. 



Stephens (T.) on an intrusion of dia- 

 base into permc-carbonifen us 

 rocks at Frederick Henry Bay, 328. 



Str ated electrical discharge, on the, 

 245. 



Strutt (Hon. R. J.) on the discharge 

 of electricity through argon and 

 helium, 293." 



Swan's prism photometer, on, 118, 

 541. 



Thermal conductivity of vulcanite, 

 on the, 15 ; of mixtures, on the, 

 286 ; expansion of porcelain, on 

 the, 90. 



radiation in absolute measure, 



on, 543. 



Thermo-electric phenomena, on some 

 novel, 309. 



Thompson (Prof. S. P.) on obliquely 

 crossed cylindrical lenses, 316. 



Thomson (Prof. J. J.) on electrolytic 

 conduction in gases, 404. 



Thorium compounds, on a radio- 

 active substance emitted from, 1 ; 

 on radio-activity produced in sub- 

 stances by the action of, 161. 



Vibrations, on the frequency of 

 transverse, of a stretched india- 

 rubber cord, 347. 



Yillard (P.) on the chemical action 

 of the .r-rays, 244. 



Viscosity of solutions, on the, 274. 



Volta's contact force, on, 70, 351,454. 



Voltaic cells, on the osmoiic pressure 

 or diffusion views of, 454 : on the 

 reversibility of, 491 . 



Vulcanite, on the thermal conduc- 

 tivity of, 15. 



Walker (G. W.) on the distribution 

 of a gas in an electrical field, 529. 



Walter (Dr. B.) on the function of a 

 condenser in an induction-coil, 

 416. 



Watkins (A. 0.) on the formation 

 of dendrites, 415. 



Wave -surface, on the geometrical 

 properties of the 228. 



Wilson (H. A.) on the variation of 

 the electric intensity and conduc- 

 tivity along the electric discharge 

 in rarefied gases, 505. 



Wires, on the elasticity of, 193. 



Wright (Dr. H. R.) on the photo- 

 metry of the diffuse reflexion of 

 light on matt surfaces, 199. 



.r-rays. on the chemical action of 

 the, 214. 



Zeeman effect on the chief lines in 

 the mercury spectrum, on the, 394. 



Zonal spherical harmonics, correc- 

 tions to Prof. Perry's table of, 572. 



END OF THE FORTY-NINTH VOLUME. 



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