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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.

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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.

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