522 
Dielectric polarization, on the elec- 
tromagnetic action of, 385. 
Drops, on a point in the theory of 
pendent, 46. 
Dynamo, on the self-regulation of the 
compound, 462, 
Dynamo-electric machine, on the pro- 
duction of alternating currents by 
means of a, 516. 
Earth, on the determination of the 
mean density of the, 219. 
Edlund (Prof. E.) cn the behaviour 
of electricity in rarefied air, 125, 
218. 
Electric current, on the influence of 
an, in modifying the rate of thin- 
ning of a liquid film, 94; on the 
measurement of strong, 396; on 
the rotation of the equipotential 
lines of an, by magnetic action, 419. 
Electrical measurements, on the ap- 
plication of photography to, 513. 
Electricity, on the behaviour of, in 
rarefied air, 125; on Edlund’s 
theory that a vacuum is a con- 
ductor of, 218. 
Electromagnetic action of dielectric 
polarization, on the, 385. 
experiments, on some, 13], 215. 
wave-surface, on the, 397. 
Electromagnets, on, 73, 333. 
Electrometer, on the quadrant, 291. 
Electromotive action of illuminated 
selenium, on the, 315. 
force, on the determination of 
chemical affinity in terms of, 1, 
102, 197; on the seat of the, in the 
voltaic cell, 153, 254, 340. 
Elliptic integral of the second kind, 
on the complete, 504. 
Elsass (Dr. A.) on a new form of 
monochord, 48. 
Energy, on the identity of, 482; on 
the paths of electric, in voltaic cir- 
cuits, 487. 
Fitzgerald (Prof. G. F.) on the rota- 
tion of the plane of polarization of 
light by reflection from the pole of 
a magnet, 100; on the structure 
of mechanical models illustrating 
some properties of the ther, 488. 
Fleming (Dr. J. A.) on the charac- 
teristic curves and surfaces of in- 
candescence-lamps, 368. 
Fog, on the theory of illumination in 
a, 443. 
Fol (M.) on the penetration of day- 
INDEX. 
light in the water of the Lake of 
Geneva, 70. : 
Fritts (Mr.) on the electromotive 
action ofilluminated selenium, 315. 
Fee rere indicator-diagrams, on, 
52. 
Gases, on the passage of electricity 
through rarefied, 125; on the limit 
of the density and on the atomic 
volume of, 313; on the determi- 
nation of the dielectric constant of 
some, 393. 
Gardner (J. S.) on the Tertiary ba- 
saltic formation in Iceland, 64. 
Geological Society, proceedings of 
the, 63, 143, 225, 389, 512. 
Glaisher (J. W. L.) on the expression 
for the complete elliptic integral 
of the second kind, 504. 
Gravitation, on a new method of 
determining the constant of, 148. 
Green (Prof. A. H.) on a section 
near Llanberis, 63. 
Hall (EK. H.) on the rotation of the 
equipctential lines of an electric 
current by magnetic action, 419. 
Harmonic motion, on some principles 
and results of, 190. 
Hartley (Prof. W. N.) on the influ- 
ence of atomic arrangement on the 
Pol properties of compounds, 
5) 
Hayes (H. V.) on the application of 
photography to electrical measure- 
ments, 513; on the production of 
alternating currents, 516. 
Heaviside (QO) on the electromagnetic 
wave-surface, 397. 
Hopkinson (Dr. J.) on the quadrant- 
electrometer, 291. 
Horizon, on an instrument for mea- 
suring angles with the, 515. 
Hughes (G.) on some West-Indian 
phosphate deposits, 144. 
Hutton (Capt. F'. W.) on the geology 
of New Zealand, 146. 
Hydrogen, on the occlusion of, by 
zine dust, 232; on the limit of the 
density of, 313. 
Illumination in a fog, on the theory 
of, 443. 
Incandescence lamps, on the most 
economical potential-difference to 
employ with, 304; on the charac- 
teristic curves and surfaces of, 368. 
Tron, on the magnetic permeability 
of, 73, 333. 
