500 



INDEX. 



tromagnetic to the electrostatic 

 unit, 315. 



Eowland (Prof. H. A.) on the ratio 

 of the electrostatic to the electro- 

 magnetic units of electricity, 304. 



Riicker (Prof.) on the relation exist- 

 ing between the density and re- 

 fraction of gaseous elements, 268. 



Rutley (F.) on tachylyte from 

 Whiteinch, 143. 



Shunt-transformer, on a, 132. 



Smith (E. W.) on a shunt-trans- 

 former, 132. 



Solar radiation, on the influence of, 

 on the electrical phenomena in the 

 atmosphere of the earth, 75. 



Solutions, on the nature of, 148 ; on 

 the viscosity of, 221 : on the mole- 

 cular constitution of isomeric, 289. 



Spectra, on metallic, 73. 



Steatite as a source of electricity, 

 on, 428. 



Sulphur, on the resistance of im- 

 perfectly purified, 469. 



Sun-spot period, on a relation be- 

 tween the, and the planetary ele- 

 ments, 426. 



Sworn (S. A.) on the constitution of 

 the aromatic nucleus, 402, 443. 



Tanakadate (A.) on the thermoelec- 

 tric position of platinoid, 163 ; on 

 the thermal effect due to reversal 

 of magnetization in soft iron, 207. 



Thermodynamics, on the second law 

 of, 493. 



Thoma (Max) on the dependence of 

 the electromotive position of pal- 

 ladium on the quantity of hydro- 

 gen it contains, 351. 



Thompson (Prof. S. P.) on geometri- 

 cal optics, 232. 



Thomson (J. J.) on the magnetic 



effects produced by motion in the 

 electric field, 1. 



Threlfall (Prof. R.) on the Clark cell 

 as a source of small constant 

 currents, 353 ; on the application 

 of the Clark cell to the construc- 

 tion of a standard galvanometer, 

 416 ; on the measurement of high 

 specific resistance, 452 ; on the 

 resistance of imperfectly purified 

 sulphur, 469. 



Tomlinson (C.) on the theory of hail, 

 169 ; on lightning and gunpowder 

 magazines, 308. 



Tumlirz (O.) on the energy of ther- 

 mal radiation at a white heat, 352 ; 

 on the mechanical equivalent of 

 light, 352. 



Tuning-forks, on a method of driving, 

 electrically, 490. 



Viscosity of solutions, on the, 221. 



Ward (A. W.) on the use of the bi- 

 quartz in determining the plane of 

 polarization, 134. 



Wiedemann (Prof. E.) on the me- 

 chanics of luminosity, 149, 248, 

 376 5 on the second law of thermo- 

 dynamics, 493. 



Wilkes (G.) on a comparison of the 

 mercury unit with the B.A. unit 

 of resistance, 17; on the value of 

 the B.A. unit of resistance in abso- 

 lute measure, 98. 



Wires, on the expansion with rise of 

 temperature of, under pulling 

 stress, 94 ; on the propagation of 

 electric waves through, 117. 



Wolf (M.) on the resistance to dis- 

 ruptive discharge by gases under 

 high pressures, 148. 



Zinc, on the spectrum of, 74. 



END OF THE TWENTY-EIGHTH VOLUME. 



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