498 



INDEX. 



D'Arcy (R. F.) on the viscosity of 

 solutions, 221. 



Davidson (C.) on a relation between 

 the sun-spot period and the pla- 

 netary elements, 426. 



De Heen (P.) on the change which 

 the internal friction of air expe- 

 riences at different temperatures 

 and under various pressures, 220. 



Diffraction-colours, on, 272. 



Duncan (Dr. L.) on the value of the 

 B. A. unit of resistance in absolute 

 measure, 98. 



Earth, on the origin of movements 

 in the crust of the, 141. 



Electric field, on the magnetic effects 

 produced by motion in the, 1. 



radiation and its concentration 



by lenses, 48. 



sparks, black, on some photo- 

 graphs of, 92. 



waves, on the propagation of, 



through wires, 117. 



Electrical phenomena in the atmo- 

 sphere of the earth, on the influ- 

 ence of solar radiation on, 75. 



resistance of insulators at high 



temperature, on the, 147. 



of bismuth, on the, 332. 



E]ectricity, on the passage of, through 

 gases and vapours, 147 ; on the 

 leakage of negative, caused by sun- 

 and daylight, 427 ; on steatite as 

 a source of, 428. 



Electrolytic dissociation versus hy- 

 dration, 30. 



Electromagnetic units of electricity, 

 on the ratio of the electrostatic to 

 the, 304, 315. 



Electromotive position of palladium, 

 on the, 351. 



Elster (T.) on the leakage of negative 

 electricity caused by sun- and day- 

 light, 427. 



Errors, on a physical basis for the 

 theory of, 480. 



Fletcher (L. B.) on the ratio of the 

 electrostatic to the electromag- 

 netic units of electricity, 304. 



Fluorescence, on the relation between, 

 and arrangement of molecules, 473. 



Fromme (C.) on the maximum gal- 

 vanic polarization of platinum 

 electrodes in sulphuric acid, 495. 



Fuller (G.) on a water-spray influ- 

 ence-machine, 42. 



Galvanometer, on the application of 



the Clark cell to the construction 

 of a standard, 416. 



Gaseous elements and some of their 

 compounds, on a relation existing 

 between the density and refraction 

 of, 268. 



Gases, on the passage of electricity 

 through, 147 ; on the resistance to 

 disruptive discharge by, under high 

 pressures, 148. 



Geitel (H.) on the leakage of nega- 

 tive electricity caused by sun- and 

 daylight, 427'. 



Geological Society, proceedings of 



- the, 71, 139, 492. 



Gladstone (Dr. J. H.) on the mole- 

 cular weight of caoutchouc and 

 other colloid bodies, 38. 



Glazebrook (R. T.) on the reflexion 

 and refraction of light at the sur- 

 face of a crystal, 110. 



Gore (Dr. G.) on the molecular con- 

 stitution of isomeric solutions, 289. 



Gregory (W. G.) on a method of 

 driving tuning-forks electrically, 

 490. 



Hail, on the theory of, 169. 



Hall (E. H.) on the ratio of the elec- 

 trostatic to the electromagnetic 

 units of electricity, 304. 



Heat, on the analvtical theory of, 

 429. 



Hertz (Prof. H.) on the propagation 

 of electric waves through wires, 

 117. 



Hibbert (W.) en the molecular 

 weight of caoutchouc and other 

 colloid bodies, 38. 



Hill (Rev. E.) on the rocks of Al- 

 derney and the Casquets, 70. 



Hoffert (Dr. H. H.) on intermittent 

 lightning-flashes, 106. 



Howard (Dr. J. L.) on electric ra- 

 diation and its concentration by 

 lenses, 48. 



Hull (Prof. E.) on a possible geolo- 

 gical origin of terrestrial mag- 

 netism, 71. 



Hutchins (O. C.) on metallic spectra, 

 73. 



Hutchinson (C. T. ) on the mercury 

 unit compared with the B.A. unit 

 of resistance, 17 ; on the value of 

 the B.A. unit of resistance in abso- 

 lute measure, 98. 



Hydration, on electrolytic dissocia- 

 tion versus, 30. 



