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INDEX TO VOL. XLIX.

ABSORPTION phenomena, on a Bouty's (Prof. E.) studies on mag-

new class of, 323.

Acoustics, researches in, 352, 428.
Allport (S.) on the microscopic struc
ture and composition of British
carboniferous dolerites, 479.

Aniline derivatives, on, 21.
Attfield (Dr.) on the spectrum of car-
bon, 106.

Audition, on new facts in the physio-
logy of, 360.

Aurora, on the spectrum of the, 65,
249, 410, 481.

Belt (T.) on the geology of the
Steppes of Siberia, 479.

Benoit (R.) on the electrical resist-
ance of metals, 78.

Bezold (W. von) on the mixture of
colours in binocular vision, 78.
Blondlot (R.) on the determination
of the quantity of magnetism in a
magnet, 482.

Böttger (R.) on the conservation and
properties of a plate of palladium
saturated with hydrogen by elec-
trolysis, 80.

Books, new :-Spottiswoode's Polari-
zation of Light, 72; Ruchonnet's
Exposition géométrique des Pro-
priétés générales des Courbes, 225;
Ruchonnet's Éléments de Calcul
approximatif, 227; Williamson's
Integral Calculus, 319; Jevons's
Principles of Science, 400; Wein-
hold's Introduction to Experimen-
tal Physics, 404.

Boron, on the specific heat of, 161,
290.

Bosanquet (R. H. M.) on the mathe-
matical theory of Hamilton's string
organ, 98.

netism, 81, 186; on the magneti-
zing-function of tempered steel,
320.

Broun (J. A.) on the sun-spot period
and the rainfall, 474.

Camacho (J.) on a new electromag-
net, 244.

Capron (J. R.) on the comparison of

some tube and other spectra with
the spectrum of the aurora, 240,
481.

Carbon, in the modern spectroscope,
on, 24, 104, 106; on the specific
heat of, 161, 175, 276.

Cockle (Sir J.) on primary forms,
134.

Colour, on combination of, by means
of polarized light, 146.
Coniferine, researches on, 229.
Cryohydrates, on the, 11, 206, 266.
Culley (R. S.) on Camacho's new
electromagnet, 332.

Curtis (Prof. A. H.) on extraordinary
reflection, 366,
Diamagnetism, on the experimental
determination of, by its electrical
inductive action, 246.

Diamond, on the specific heat of,
175.

Diffraction, on the projection of the
Fraunhofer lines of, on a screen,
142.

Dolerites, on the microscopic struc-
ture and composition of British
carboniferous, 479.

Draper (Prof. J. C.) on the projec-
tion of the Fraunhofer lines of dif-
fraction and prismatic spectra on a
screen, 142.

Electric conducting-power of the

chlorides of the alkalies, alkaline
earths, and nitric acid in aqueous
solutions, on the, 417.
Electric discharge, on a new method of
investigating the composite nature
of the, 47.

Electrical problems, on graphical me-
thods of solving certain, 368.

resistance of metals, researches
on the, 78.

Electricity, on the flow of, in a uni-
form plane conducting surface,
385, 453.

Electrolysis of certain metallic chlo-
rides, on the, 425.
Electrolytes, experimental investiga-
tion of the work of the current in
the interior of, 417.
Electromagnet, on a new, 244, 332,

484.

Equilibrium and initial and steady
motions, on general theorems re-
lating to, 218.

Etna, on the eruption of, on the 29th
August, 1874, 126.

Explosive bodies, on the decomposi-
tion of certain, 157.
Flames, on the reflecting-power of,
50; on the reflection of sound
from, 428.

Force, on Helmholtz's memoir on
the conservation of, 377.
Foster (Prof. G. C.) on graphical

methods of solving certain electri-
cal problems, 368; on the flow of
electricity in a uniform plane con-
ducting surface, 385, 453.
Galton (F.) on statistics by intercom-
parison, with remarks on the law
of frequency of error, 33.
Gases, on the liberation of, from su-
persaturated solutions, 157, 302;
on the work that may be gained
during the mixture of, 311; on the
coefficient of friction of, 332; on
the spectra of, 333, 448.
Geological Society, proceedings of
the, 73, 152, 237, 326, 408, 478.
Gernez (D.) on the liberation of gases
from their supersaturated solutions
and the decomposition of certain
explosive bodies, 157.

Gladstone (Prof. J. H.) on the elec-
trolysis of certain metallic chlorides,

425.

Glaisher (J.W. L.) on partitions, 307.

Goldstein (E.) on the spectra of gases,
333, 448.

Graphite, on the specific heat of,
276.

Grotrian (O.) on the electric conduct-
ing-power of the chlorides of the
alkalies, alkaline earths, and nitric
acid in aqueous solutions, 417.
Guthrie (F.) on salt-solutions and
attached water, 1, 206, 266.
Haarmann (W.) on coniferine and its
conversion into the aromatic prin-
ciple of Vanilla, 229.

Hamilton's string-organ, on the ma-
thematical theory of, 98.

Hautefeuille (P.) on the solution of
hydrogen in metals, and on the de-
composition of water by iron, 413.
Heat, on the theory of, 154; on the
mechanical equivalent of, 416.
Herschel (Prof. A. S.) on the spec-
trum of the aurora, 65.

Holtz machine, experiments with the,
411.

Hydrogen, on the solution of, in
metals, 413.

Ice, on permanent, in a mine in the
Rocky Mountains, 77.

Iron, on the decomposition of water
by, 413.

Kohlrausch (Prof. F.) on the electric
conducting-power of the chlorides
of the alkalies, alkaline earths, and
nitric acid in aqueous solutions,
417.

Light, on polarization by diffusion of,
50.

Liquids, on some phenomena con-

nected with the boiling of, 432.
Lockyer (J. N.), spectroscopic notes
by, 233, 320.

Lodge (O. J.) on the flow of electri-
city in a uniform plane conducting
surface, 385, 453.

Lyman (Prof. C. S.) on Venus as a
luminous ring, 159.
Magnet, on the determination of the

quantity of magnetism in a, 482.
Magnetism, studies on, 81, 186; on,
243.

Mallet (R.) on volcanic energy, 144;

on expansion by refrigeration, 231.
Mayer (Prof. A. M.) on the compo-
site nature of the electric discharge,
47; researches in acoustics by, 352,
428.

Metallic chlorides, on the electrolysis

of certain, 425.

Metals, on the electrical resistance of,
78; on the solution of hydrogen
in, 413.

Mills (Dr. E. J.) on aniline deriva-
tives, 21.

Molecular structure, on the evidence
of variation in, 235.
Moon (R.) on Helmholtz's memoir

on the conservation of force, 377.
Moutier (J.) on the expression of the
work relative to an elementary
transformation, 154.

Nitric acid, on the electric conduct-
ing-power of, in
aqueous solutions,
421.

Obermayer (Capt. A. von) on the de-
pendence of the coefficient of fric-
tion of atmospheric air on tempe-
rature, 332.

Palladium, on the conservation and
properties of a plate of, saturated
with hydrogen by electrolysis, 80.
Partitions, on, 307.

Polariscope, on a new revolving,
472.

Polarization by diffusion of light, on,
50.

Primary forms, on, 134.

Puluj (H. J.) on a lecture-room ap-
paratus for the determination of
the mechanical equivalent of heat,
416.

Rainfall, on the sun-spot period and
the, 474.

Rayleigh (Lord) on a statical theo-
rem, 183; on general theorems
relating to equilibrium and initial
and steady motion, 218; on the
work that may be gained during
the mixing of gases, 311.
Reflection, on extraordinary, 366.
Refrigeration, on expansion by, 231.
Rossetti (F.) on experiments with the
Holtz machine, 411.

Royal Society, proceedings of the,
144, 229, 320, 474.

Salt solutions and attached water, on,
1, 206, 266.

Schwendler (L.) on the general theory
of duplex telegraphy, 108.
Sea-water, on the freezing of, 17.
Silicon, on the specific heat of, 161,

294.

Silvestri (Prof. O.) on the eruption of
Etna on the 29th August, 1874,
126.

Soret (J.-L.) on polarization by dif
fusion of light, 50.

Sound, on the transmission of, 151;

on the law connecting the pitch of
a, with the duration of its residual
sensation, 352; on the reflection
of, from flames and heated gases,
428.

Spectra, on the projection of pris-
matic, on a screen, 142; of gases,
on, 333, 448.

Spectroscopic notes, 233, 320.
Spectrum-analysis, researches in, 326.
Spectrum of carbon, on the, 24, 104,
106.
Spottiswoode (W.) on combination of
colour by means of polarized light,
146; on a new revolving polari-
scope, 472.

Statical theorem, on a, 183.
Statistics by intercomparison, on, 33,
Steel, on the magnetization of, 90,
329.

Steel magnets, on the theory of,
199.

String organ, on the mathematical
theory of Hamilton's, 98.
Sun, on the spectrum of the, 326.
Sun-spot period and the rainfall, on
the, 474.

Telegraphy, on the general theory of
duplex, 108.

Tiemann (F.) on coniferine and its
conversion into the aromatic prin-
ciple of vanilla, 229.

Toepler (Prof. A.) on the experimen-
tal determination of diamagnetism,
246.

Tomlinson (C.) on the action of solids
in liberating gas from solutions,
302; on some phenomena connected
with the boiling of liquids, 432.
Trève (A.) on magnetism, 243.
Tribe (A.) on the electrolysis of cer-
tain metallic chlorides, 425.
Troost (L.) on the solution of hydro-
gen in metals, and on the decom-
position of water by iron, 413.
Trowbridge (J.) on Camacho's new
electromagnet, 484.

Tyndall (Prof. J.) on the transmis-
sion of sound, 151.

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