576 



INDEX. 



Slit, on the admissible width of the, 

 in interference experiments, 472 ; 

 on the orientation of the, 553. 



Simian (Dr. M. S. de) on conduc- 

 tion of heat by rarefied gases, 192. 



Solar magnetization, on possible 

 effects of, on periodic variations of 

 terrestrial magnetism, 395. 



Solutions, on the conductivity method 

 of studying moderately dilute 

 aqueous, of double salts, 599. 



Spectra, on a method of reducing 

 prismatic, 297. 



Spectrometer, on the mimntina; of 

 the large Rowland, in the Royal 

 University of Ireland, 233. 



Spectrum of hydrogen, on the com- 

 pound line-, 338. 



Stansfield (A.) on improvements in 

 the Roberts - Austen recording 

 pyrometer, 59. 



Steel, on the anomalous changes in 

 the length and temperature of, 

 during recalescence, 173. 



Stoney (Dr. G. J.) on microscopic - 

 vision, 156 ; on evidence that 

 Rontgen rays are ordinary light, 

 253. 



Strains, on instruments for measur- 

 ing small, in bars subjected to 

 twist, 520. 



Susceptibility, on the balance method 

 of measuring- magnetic, 572. 



Sutherland (W.) on the latent heat 

 of evaporation of zinc and cad- 

 mium, 345. 



Svedelius (G. E.) on the anomalous 

 changes in the length and tempe- 

 rature of iron and steel during 

 recalescence, 173. 



Swinton (A. A. C.) on the circu- 

 lation of the residual gaseous 

 matter in a Crookes tube, 387, 393. 



Teall (J. J. H.) on a phosphatized 

 trachyte from Clippercon Atoll, 

 166 ; on rocks and fossih from 

 Franz Josef Land, 508. 



Tnermo-couple, theory of the, 74. 



Thermo-electric pvrometry, notes on, 

 59. 



Thermometers, comparison of Row- 

 land's, with the Paris standard, 1. 



Thomson (Prof. J. J.) on the mechan- 

 ical forces acting on a piece of iron 

 carrying an electric current, 154 ; 

 on the charge of electricity carried 



END OF THE FORTY 



by the ions produced by Rontgen 

 rays, 528. 



Tomlinson ( H. J. ) on continuous 

 beams, 306. 



Torsional angle of a rotating shaft, 

 on a method of measuring the, 

 269, 348. 



Trowbridge (Prof. J.) on the beha- 

 viour of air and rarefied gises 

 under powerful electric stress, 243. 



Ultra-violet light, on continuity in 

 undulatory theory of, visible Jiafht, 

 &c, 494. 



Velocitv, on the question of absolute, 

 414/ 



Vincent (Dr. J. H.) on the photo- 

 graphy of ripples, 290 ; on a model 

 to illustrate Helmholtz's theory 

 of dispersion, 557. 



Walker (J.) on the admissible width 

 of the slit in interference experi- 

 ments, 472; on the orientati m of 

 the same, 553. 



Walter (B.) on the function of the 

 condenser in a Ruhmkorlfs coil, 

 172. 



Waves, on the attenuation of electric, 

 along a line of negligible leakage, 

 298; on continuity in undulatory 

 theory of condensational-raref ac- 

 tional, in gase3, liquids, and solids, 

 of distortional, in solids, and of 

 electric, in all substances capable 

 of transmitting them, 494. 



Wedd (C. B.) on the corallian rocks 

 of Upware, 593. 



Wharton (Rear- Admiral Sir W. J.) 

 on Olipperton Atoll, 165. 



Wheel -gearing, on a new combi- 

 nation of, 428, 571. 



White light, on the determination 

 of, 216. 



Wilson (G.) on continuous beams, 

 503. 



Wires, on the virtual resistance of 

 thin, for rapidly alternating cur- 

 rents, 426. 



Wood (R. W.) on equilibrium-figures 

 formed by floating, magnets, 162 ; 

 on the anomalous dispersion of 

 cyanin, 380. 



Zeleny (J) on the ratio of the velo- 

 cities of the two ions produced in 

 gases by Rontgen radiation, 120. 



Zinc, on the latent heat of evapo- 

 ration of, 345. 



-SIXTH VOLUME. 



Printed by Taylor and Francis, Red Lion Court, Fleet Street. 



