Earths, on the spectra of some,
302.

Edlund (Prof. E.) on the path of
electrical induction- and disjunc-
tion-currents through gases of va-
rious densities and between poles
of different shapes, 14.
Electric current, on the use of the, in
calorimetry, 142.

spark, on the duration of the,
78.
Electrical discharge, researches on the,
42.

induction- and disjunction-cur-
rents, on the path of, through
gases, 14.

resistance, on a simple method
of constructing high, 41.
Electricity, on the molecular theory
and laws of, 390.

Electrodynamic spirals, on the mag-
netism of, 264.

Electrolytes, on the extension of
Ohm's law to, 227.
Electromotive force, on the influence
of heat on, 310.

Electroscopic experiments, on a cause
of error in, 128.

Equations, on the solution of linear
partial differential, 35, 149.
Equilibrium, experimental and theo-
retical researches into the figures of,
of a liquid mass without weight, 355.
Erbia, on the spectrum of, 302.
Flexure, on the cause and theoretic

value of the resistance of, in beams,
130.

Gases, on internal work in, 81, 197,

268; on the compressibility of,
under high pressures, 146.
Geodesic lines on an oblate spheroid,
on the, 329.

Geological Society, proceedings of
the, 68, 136, 225, 309, 380.
Gibbs (Dr. W.) on the measurement
of wave-lengths by means of indices
of refraction, 177; on liquids of
high dispersive power, 229;
tests for the perfection and paral-
lelism of plane surfaces of glass,
311.

on

Glaciers, on the cause of the descent
of, 1, 153.

Glass, on tests for the perfection and
parallelism of plane surfaces of,
311.

Gore (G.) on the molecular move-

ments and magnetic changes in iron.

170; on the magnetism of electro-
dynamic spirals, 264.

Granites of Scotland, on the consti-
tuent minerals of the, 59.
Gréhant (N.) on the rapidity of the
absorption of carbonic oxide by the
lungs, 150.

Guthrie (Prof. F.) on approach caused
by vibration, 345.
Hagenbach (E.) on the melting of
leaden projectiles by their impact
upon an iron plate, 462.
Haughton (Rev. S.) on the constitu-
ent minerals of the granites of Scot-
land, 59.

Heat, on the interchangeability of,
and mechanical action, 51, 103,
218, 429; on a mechanical theo-
rem applicable to, 122; on the in-
fluence of, on electromotive force,
310; on the radiation of, from the
moon, 372.

Heath (Rev. J. M.) on the inter-
changeability of heat and mecha-
nical action, 51, 218, 429.
Heights, on contour-lines and mea-
surement of, 421.

Heppel (J. M.) on the theory of con-
tinuous beams, 446.
Hills and dales, on, 421.

Huggins (Dr. W.) on the spectra of

erbia and some other earths, 302.
Huxley (Prof.) on a new genus of Di-
nosauria, 68; on the affinity be-
tween the Dinosaurian reptiles and
birds, 69; on the Dinosauria of the
trias, 70.

Iron, on the molecular movements
and magnetic changes in, 170.
Jamin (J.) on the use of the electric
current in calorimetry, 142.
Koenig (R.) on the fixed notes cha-
racteristic of the various vowels,
145.

Kohlrausch (F.) on the extension of
Ohm's law to electrolytes, and on
the numerical determination of the
resistance of dilute sulphuric acid,
227.

Kundt (A.) on the boiling in conjunc-
tion of two liquids which do not
mix, 463.
Laplace's coefficients, on the equa-
tion of, 434.

Leclanché's manganese elements, ob-
servations on, 460.

Le Sueur (A.) on the great Melbourne
telescope, 377.

Light, on the dispersion of, 105.
Lime, on the spectrum of, 303.
Liquids, on the adhesion between,
and solids, 190; of high dispersive
power, on, 229; on the magnetic
rotatory polarization of, 393; on
the boiling in conjunction of two,
which do not mix, 463.
Loewy (B.) on solar physics, 53.
Lorenz (L.) on the molecular theory
and laws of electricity, 390.

Lucas (M.) on the duration of the
electric spark, 78.

Lungs, on the rapidity of the absorp-
tion of carbonic oxide by the, 150.
Luvini (Prof. G.) on the adhesion
between solids and liquids, 190.
Magnesia, on the spectrum of, 303.
Magnetism of electrodynamic spirals,
on the, 264.

Manganese elements, on Leclanché's,
460.

Maxwell (Dr. J. C.) on hills and dales,
421.

Merz (S.) on an object-glass spectral
apparatus, 294.

Meteor of Nov. 19, 1870, observations
on the, 440.

Mills (Dr. E. J.) on the chemical
activity of nitrates, 134; on che-
mical substance and chemical func-
tions, 259.

Moon, on the radiation of heat from
the, 372.

Moon (R.) on the solution of linear
partial differential equations, 35,
149; on the equation of Laplace's
coefficients, 434.

Moseley (Canon) on the cause of the
descent of glaciers, 1.

Müller (J.) on Leclanché's manga-
nese elements, 460.
Nebulæ, on a theory of, 300; note on
spiral, 389.

Nippoldt (A.) on the extension of
Ohm's law to electrolytes, and on
the numerical determination of the
resistance of dilute sulphuric acid,
227.

Nitrates, on the chemical activity of,
134.

Ocean-currents, on the physical cause
of, 233.

Optometer, remarks on a new, 340.
Phillips (S. E.) on a simple method

of constructing high electrical re-
sistance, 41.

Plateau (Prof.) on the figures of equi-
librium of a liquid mass without
weight, 355.

Polarization, on the magnetic rotatory,
of liquids, 393.

Pratt (Archdeacon) on the method of
determining the thickness of the
earth's crust by the precession and
nutation of the earth's axis, 10.
Projectiles, on the melting of leaden,
by their impact upon an iron plate,
462.

Rankine (Dr. W. J. M.) on thermody-
namics, 103,291; on the thermody-
namic acceleration and retardation
of streams, 288; on the meteor of
November 19, 1870, 440; on Mr.
Heppel's theory of continuous
beams, 457.

Refractive indices and dispersion of
opaque bodies, on the, 105.
Resistances, on a new method of de-
termining, 441.

Roscoe (Prof. H. E.) on the relation
between the sun's altitude and che-
mical intensity, 56; on vanadium,
62.

Rosse (Earl of) on the construction
of thermopiles, 569; on the radia-

tion of heat from the moon, 372.
Royal Society, proceedings of the, 53,
128, 221, 302, 369, 446.
Saline solutions, on supersaturated,

221; on the action of low tempera-
tures on supersaturated, 295.
Seabroke (G. M.) on the nature of the
corona, 117.

Seebeck (A.) on the propagation of
sound in tubes, 231.

Smyth (Prof. C. P.) on supra-annual
cycles of temperature in the earth's
surface-crust, 58.

Solar physics, researches on, 53.
protuberances, on, 427.
Solids and liquids, on the adhesion
between, 190.

Sondhauss (Dr.) on the tones of

heated tubes and aërial vibrations
in pipes of various forms, 211.
Sound, on the velocity of the propa-
gation of, in water, 76; on the pro-
pagation of, in tubes, 231.
Spectral apparatus, on an object-glass,

294.

Stewart (Dr. B.) on solar physics, 53.

Streams, on the thermodynamic acce-
leration and retardation of, 288.
Strutt (the Hon. J. W.) on the tones
of heated tubes and aërial vibra-
tions in pipes of various forms, 211.
Sulphuric acid, on the determination
of the resistance of dilute, by means
of alternate currents, 227.
Sun, on the relation between the alti-
tude and chemical intensity of the,
56; on the temperature and phy-
sical constitution of the, 313.
Temperature, on supra-annual cycles
of, in the earth's surface-crust, 58.
Thermodynamics, on, 51, 103, 218,
429.

Thermometers, on deep-sea, 132.
Thermopiles, on the construction of,
369.

Thorpe (Prof. T. E.) on the relation
between the sun's altitude and che-
mical intensity, 56.
Tomlinson (C.) on supersaturated sa-
line solutions, 221; on the action
of low temperatures on supersatu-
rated saline solutions, 295; on a

salt that is invisible in its mother-
liquor, 328.

Tones of heated tubes, on the, 211.
Vanadium, researches on, 62.
Vibration, on approach caused by,345.
Vowels, on the fixed notes charac-
teristic of the various, 145.
Warren (T. T. P. B.) on a new me-
thod of determining resistances,
441.
Watersheds and watercourses, on,425.
Watts (Dr. W. M.) on the spectra of
carbon, 100.

Wave-lengths, on the measurement of,
by means of indices of refraction,
177.

Wernicke (W.) on the refractive in-
dices and the dispersion of opaque
bodies, 105.
Wheatstone (Sir C.) on a cause of
error in electroscopic experiments,

128.

Zöllner (Prof. F.) on the temperature
and physical constitution of the
sun, 313; on solar protuberances,
427.