INDEX. 



551 



Hopkinson (J.) on an unnoticed 

 danger in certain apparatus for 

 distribution of electricity, 292 ; on 

 the seat of the electromotive forces 

 in a voltaic cell, 336. 



Hutton (Capt. F. W.) on the geo- 

 logy of New Zealand, 212. 



Hydrocarbon radicals, on the melt- 

 ing- and boiling-points of the 

 halogen and alkyl compounds of 

 the, 497. 



Hydrogen, on the occlusion of, by 

 zinc -dust, 464. 



Hygrometer, on new forms of, 220, 

 468. 



Hygrometry, observations on, 213. 



Incandescence lamps, on molecular 

 shadows in, 141. 



Iodide of starch, on the bleaching of, 

 by; heat, 168. 



Jamin (M.) on hygrometry, 213. 



Judd (Prof. J. W.) on the deep boring 

 at Richmond, 210. 



Kerr (Dr. J.) on the electro-optic 

 action of a charged Franklin's 

 plate, 363. 



Konig (W.) on the coefficients of in- 

 ternal friction, 387. 



Langley (Prof. S. P.) on the trans- 

 mission of light by wire-gauze 

 screens, 387. 



Larmor (J.) on the molecular theory 

 of galvanic polarization, 422. 



Lepinay (M. de) on an optical me- 

 thod for the measurement of small 

 lengths, 79. 



Light, on the depth of penetration 

 of, in sea- water, 74 ; on the spe- 

 cific retraction and dispersion of, 

 by the alums, 162 ; oa the produc- 

 tion of monochromatic, on the 

 screen, 172 ; on the sensitiveness 

 of selenium to, 178 ; on the trans- 

 mission of, by wire-gauze screens, 

 387. 



Lippmann (G.) on a mercury-galva- 

 nometer, 220. 



Lodge (Prof. 0.) on the stream-lines 

 of moving vortex-rings, 67 ; on the 

 seat of the electromotive forces in 

 a voltaic cell, 372. 



Lommel (E.) on the visible represen- 

 tation of the focus of ultra-red rays 

 by phosphorescence, 547. 



Ludeking (C.) on the disengagement 

 of heat in the swelling and solution 

 of colloids, 220. 



Luminiferous aether, on the, 389. 



Magnetic field, on the deformation of 

 the luminous wave-surface in the, 

 216 ; on measurements of the in- 

 tensity of the horizontal component 

 of the earth's, 484. 



Marr (J. E.) on the lower Palaeozoic 

 rocks of Haverfordwest, 208. 



Mendenhall (T. 0.) on a differential 

 resistance-thermometer, 384. 



Mercury, on the electrical conducti- 

 vity of solid, 77. 



Mercury-galvanometer, on a, 220. 



Metallic oxides, on the polymeriza- 

 tion of the, 81. 



Metals, on the electrical conductivity 

 of, at low temperatures, 77. 



Molecular shadows in incandescence 

 lamps, on, 141. 



New all (H. F.) on colliding water- 

 jets, 31. 



Nicol (Dr. W. W. J.) on supersatu- 

 ration of salt-solutions, 295. 



Ohm, on the determination of the, 41 7 . 



Optical method for the absolute mea- 

 surement of small lengths, 79. . 



Penning (W. H.) on the goldfields 

 of the Transvaal, 206. 



Periodic law, on the, 259, 497. 



Phosphorescence, on the visible re- 

 presentation of the ultra-red rays 

 by, 547. 



Polarization, on the molecular theory 

 of galvanic, 422. 



Polymerization of the metallic oxides, 

 on the, 81. 



Quincke's (Prof.) method of calcu- 

 lating surface-tensions, observa- 

 tions on, 51. 



Ramsay (Dr. W.) on some thermo- 

 dynamical relations, 515. 



Eayleigh (Lord) on the accuracy of 

 focus for perfect definition, 354 ; 

 on an improved apparatus for 

 Christiansen's experiment, 358 ; on 

 the optical comparison of methods 

 for observing small rotations, 360 ; 

 on the thermodynamic efficiency 

 of the thermopile, 361. 



Read (T. M.) on the action of land- 

 ice at Great Crosby, 73. 



Resistance-coils, B.A. standard, 

 comparison of, with mercury 

 standards, 343. 



Reynolds (Prof. 0.) on the dilatancy 

 of media composed of rigid par- 

 ticles in contact, 469. 



