ADHESION, on apparent, 465.

Æther, on the number and weight
of the molecules of, contained in
electric conductors, 190.

Air, on the condensation of a mixture
of, and steam on cold surfaces, 67;
on the law of gyration of the, 229.
Air-battery, on an, 61.

Alloys, on the electromotive and ther-
moelectric forces of some metallic,
in contact with copper, 28; on the
quantitative analysis of certain, by
means of the spectroscope, 311.
Atmosphere, on the acoustic transpa-
rency and opacity of the, 277, 374.
Barometer, on a variation-, 362.
Barrett (Prof. W. F.) on the molecu-
lar changes that accompany the
magnetization of iron, nickel, and
cobalt, 51.

Books, new:-Wilson's Elementary
Geometry, 56; Pierce's Practical
Solid or Descriptive Geometry, 153;
Yarnall's Catalogue of Stars, 155;
Hawtrey's Elements of Euclid,
215; Tait's Quaternions, 364;
Muir's Expression of a Quadratic
Surd, 366; Proctor's Universe,
367; Reeks's Elementary Astro-
nomy, 374.

Bourbouze (M.) on a process for ve-
rifying the nodes in a sounding
pipe, 80.

Bouty (E.) on the permanent mag-
netism of steel, 315.

Brodie (Sir B. C.) on the electric de-
composition of carbonic-acid gas,
309.

Bromide of silver, on the sensibility
to light of, 273.
Brough (R. S.) on Wheatstone's
bridge, 22.

Broun (J. A.) on the period of hemi-
spherical excess of sun-spots, 311.

Buchanan (J. Y.) on an apparatus for
gas-analysis, 1.

Calendar, on a new form of, 357.
Capillary and electrical phenomena,
on the connexion between, 281.
Carbonic-acid gas, on the electric de-
composition of, 309.

Carpenter (Dr. W. B.) on the phy-
sical cause of ocean-currents,
359.

Cayley (Prof.) on the mathematical
theory of isomers, 444.

Cazin (Ă.) on the calorific effects of
the magnetism in an electromagnet
with several poles, 392.

Challis (Prof.) on the source of ter-
restrial magnetism, 14; on the
analytical principles of hydrodyna-
mics, 25; on the effects produced
by fog and vapour on the intensity
of sound, 277.

Chambers (F.) on the diurnal varia-
tions of the wind and barometric
pressure at Bombay, 228.
Circle-quadrature, on Sylvester's and
other forms of continued fraction
for, 331.

Cobalt, on the molecular changes
that accompany the magnetization
of, 51.
Condensers, on telegraphic signalling
with, 426.

Contact theory of the galvanic cell,
on the new, 401.

Cooke (Prof. J. P.) on the Vermicu-
lites, their crystallographic and
chemical relations to the micas,
and on the variation of the opti-
cal angle in these minerals, 241.
Croll (J.) on the physical cause of
ocean-currents, 94, 168, 434.
De la Rive (A.) on the effects of mag-
netism on the electric discharge
through a rarefied gas, 462.

Desains (P.) on Newton's coloured
rings, 236.
Dewar (J.) on the physical constants
of hydrogenium, 334.
Diffraction-gratings, on the manufac-
ture and theory of, 81, 193.
Disk, on the heating of a, by rapid
rotation in vacuo, 219.

Ebonite, on the expansibility of, by
heat, 156.

Electric conductors, on the number
and weight of the molecules of
æther contained in electric conduc-
tors, 190.

discharge, on the effects of mag-
netism on the, through a rarefied
gas, 462.

Electrical machines, on a simple con-
densing collector for frictional,
49.

and capillary phenomena, on the
connexion between, 281.

resistance, on the absolute value
of the Siemens mercury unit of,
294, 342.

Electricity, on the action of, on gases,
309.

Electrified conductors, on the dis-
charge of, 157.

Electrodes, on the disintegration of
the, in the galvanic arc of light, 6.
Electromagnet, on the calorific effects

of the magnetism in an, with seve-
ral poles, 392.

Electromagnetic unit, on the number

of electrostatic units in the, 218.
Elliptic transcendent identity, on the
verification of an, 437.

Energy, on the measure of work in
the theory of, 291.

Fleming (J. A.) on the new contact
theory of the galvanic cell, 401.
Fluid, on double refraction in a vis-
cous, in motion, 390.

Fog, on the effects produced by, in
the atmosphere, on the intensity of
sound, 277, 374.

Fraunhofer's lines, on the determina-
tion of the prime angle of incidence
and prime azimuth for the different,
321.

Galvanic polarization in liquids free
from gas, observations on, 145.

cell, on the new contact theory
of the, 401.
Gas-analysis, on an apparatus for, 1.

Gases, on the action of electricity on,
309.

Geological Society, proceedings of
the, 74, 229, 313, 457.
Geometrical problem, on a direct so-
lution of a, 354.

Gladstone (Dr. J. H.) on an air-bat-
tery, 61.

Glaisher (J. W. L.) on the verifica-
tion of an elliptic transcendent
identity, 437.

Gun-cotton, on the spectrum of the
light of exploding, 319.

Hallite, on the crystallographic struc-
ture and chemical composition of,
264.
Hautefeuille (P.) on hydrogenized pal-
ladium, 397.

Heat, on the mechanical equivalent
of, 155; on the expansibility of
ebonite by, 151.
Heaviside (O.) on Wheatstone's
bridge, 93; on telegraphic signal-
ling with condensers, 426.
Helmholtz (Dr.) on galvanic polariza-
tion in liquids free from gas, 145;
on the limits of the effective power
of microscopes, 236.
Herschel (Capt. J.) on a new form of
calendar, 357.

Herwig (H.) on the disintegration of
the electrodes in the galvanic arc
of light, 6; on the number and
weight of the molecules of æther
contained in electric conductors,
190.

Hesse (Mr.) on the direct solution of
a geometrical problem, 354.
Holtz machine, on a spark-adjuster
for the, 467.

Hübener (J.) on a peculiar oecurrence
of crystallized silicic acid, 319.
Hydrodynamics, on the analytical
principles of, 25, 143.

Hydrogenium, on the physical con-
stants of, 334.

Ice, on some crystalline forms of,

122.
Illumination, on some phenomena of,
77.

Insulated wires, on a method of find-
ing faults in, 416.

Iron, on the molecular changes that
accompany the magnetization of, 51.
Isomers, on the mathematical theory
of, 444.

Jefferisite, on the crystallographic
structure and chemical composition
of, 252.

Karstenite, on some crystalline forms
of, 122.

Ketteler (Prof.) on the boundary-con-
ditions of reflection and refraction
for the principal section of media
in motion, 411.
Kohlrausch (F.) on the expansibility

of ebonite by heat, 156; on the
absolute value of the Siemens mer-
cury unit of electrical resistance,
294, 342; on a variation-barome-
ter, 362.

Lallemand (A.) on some phenomena
of illumination, 77.
Light, measurements of the polariza-
tion of the, reflected by the sky and
by one or more plates of glass, 127;
on some phenomena of polarization
by diffusion of, 205; on the action
of, on the electrical resistance of
selenium, 216; on extraordinary
developments of, in grinding hard
stones, 237; on the sensibility of
bromide of silver to, 273; on the
intensity of reflected and refracted,
411.

Lippmann (G.) on the connexion be-

tween capillary and electrical phe-
nomena, 281.

Liquids, on galvanic polarization in,
145.

Lockyer (J. N.) on the quantitative

analysis of certain alloys by means
of the spectroscope, 311; on spec-
trum-analysis, 384.

Lohse (O). on the spectrum of the

light of exploding gun-cotton, 319.
M'Kichan (D.) on the number of
electrostatic units in the electro-
magnetic unit, 218.

Mädler (Dr. J. H. von), notice of the
late, 320.

Magnetic forces, on the theory of the,
318.

Magnetism, on the source of terres-

trial, 14; on the 26-day period of
terrestrial, 311; on the calorific
effects of the, in an electromagnet
with several poles, 392; on the
effects of, on the electric discharge
through a rarefied gas, 462.

315.

of steel, on the permanent,

Maxwell (J. C.) on double refraction
in a viscous fluid in motion, 390.
Metallic alloys, on the electromotive
and thermoelectric forces of some,
in contact with copper, 28.

Micas, on the crystallographic and
chemical relations of the vermicu-
lites to the, 241.

Microscopes, on the limits of the
effective power of, 236.

Milky Way, on the constitution of the,
370.

Miller (Prof. W. H.) on quartz, ice,
and Karstenite, 122.

Mines, on the composition of the
waters from some, 164.

Minot (J. J.) on a spark-adjuster for
the Holtz machine, 467.

Moon (R.) on the analytical princi-
ples of hydrodynamics, 143; on
the measure of work in the theory
of energy, 291.

Moutier (J.) on the discharge of elec-
trified conductors, 157.

Muir (J.) on Sylvester's and other
forms of continued fraction for
circle-quadrature, 331.

Newton's coloured rings, experimen-
tal researches on, 236.
Nickel, on the molecular changes that
accompany the magnetization of,
51.

Nöggerath (Prof. J.) on extraordinary
developments of light in grinding
hard stones, 237.

Ocean, on the chemistry of the, 1.
Ocean-currents, on the physical cause
of, 94, 168, 359, 434.

Oolites of Northamptonshire, on the,
74.

Ozone, on the composition of the
unit of, 310.

Palladium, on hydrogenized, 397.
Phillips (J. A.) on the composition
of certain mine waters, 164.
Photography, improvements in, 273.
Pickering (Prof. E. C.) on the polar-
ization of the light reflected by the
sky, and by one or more plates of
glass, 127.

Polarization, on some phenomena of,
by diffusion of light, 205.
Quartz, on some crystalline forms of,
122.

Quincke (G.) on the determination of
the prime angle of incidence and

prime azimuth for the different
Fraunhofer's lines, 321.
Rayleigh (Lord) on the manufacture
and theory of diffraction-gratings,
81, 193; on the theory of resona-
tors, 419.

Reflection and refraction, on the
boundary-conditions of, for the
principal section of media in mo-
tion, 411.

Refraction, on double, in a viscous
fluid in motion, 390.
Resonators, on the theory of, 419.
Reynolds (Prof. O.) on the conden-
sation of a mixture of air and steam
on cold surfaces, 67.
Roberts (S.) on a simple condensing
collector for frictional electrical ma-
chines, 49.

Roberts (W. C.) on the quantitative
analysis of certain alloys by means
of the spectroscope, 311.
Rosse (the Earl of) on the electric
resistance of selenium, 161.
Royal Institution, proceedings of the,
374.

Royal Society, proceedings of the, 61,
216, 309, 384, 447.

Sale (Lieut.) on the action of light on
the electrical resistance of selenium,
216.

Sarasin (E.) on the effects of mag-
netism on the electric discharge
through a rarefied gas, 462.
Secchi (Father A.) on the tempera-
ture of the sun, 394.
Selenium, on the electric resistance

of, 161; on the action of light on
the electrical resistance of, 216.
Serrano y Fatigati (H.) on the me-
chanical equivalent of heat, 155.
Sharp (S.) on the oolites of North-
amptonshire, 74.

Siemens mercury unit of electrical
resistance, on the absolute value
of, 294, 342.

Silicic acid, on a peculiar occurrence
of crystallized, 319.

Sky, measurements of the polarization

of the light reflected by the, 127.
Soret (J. L.) on some phenomena of
polarization by diffusion of light,
205.

Sound, on the effects produced by
fog and vapour in the atmosphere
on the intensity of, 277, 374.

Steam, on the condensation of a mix-
ture of, and air on cold surfaces,
67.

Steel, on the permanent magnetism
of, 315.

Stefan (J.) on the theory of the mag-
netic forces, 381; on apparent ad-
hesion, 465.

Sterlingite, on the crystallographic
structure and chemical composition
of, 247.

Stewart (Prof. B.) on the heating of
a disk by rapid rotation in vacuo,
219.

Sun, on the spectrum of the, 384; on
the temperature of the, 391.
Sundell (Dr. A. F.) on the electro-

motive and thermoelectric forces of
some metallic alloys in contact
with copper, 28.
Sun-spots, on the period of hemi-
spherical excess of, 311.

Tait (Prof. P. G.) on the heating of
a disk by rapid rotation in vacuo,
219.
Telegraph-lines, on the testing of, 22,
93, 416, 426.

Terquem (A.) on the vibroscope tono-
meter, 212.

Thomson (Prof. J.) on certain rela-
tions between the gaseous, the
liquid, and the solid states of
water-substance, 447.
Tonometer, on the transformation of
the vibroscope into a, 212.
Tribe (A.) on an air-battery, 61.
Troost (L.) on hydrogenized palla-
dium, 397.

Tyndall (Prof.) on the acoustic trans-

parency and opacity of the atmo-
sphere, 374.

Vapour, on the effects produced by,
on the intensity of sound, 277,
374.
Vermiculites, on the, their crystallo-
graphic and chemical relations to
the micas, 241.

Vibrations, on the determination of
the absolute number of, 212.