Acharius, Dr. on two new genera of
lichens, 455.

Acidity and Alkalinity, on, 187.
Adhesive slate, absorption of gases by,
250.

Africa, voyage of discovery to, 392.
Agaric, mineral, absorption of gases
by, 251.

Ailsa, craig of, structure of, 61.

Air, resistance of, to differently shaped
bodies, 277.

Alcyonia, fossil, some new varieties
of, 59.

Amalgam of mercury and hydrogen,
234.

Animal concretion, 397.

Apothecaries, regulations for the exa-
mination of, 387.
Arragonite, crystals of, 235.

Asbestus, ligniform,

gases by, 250.

absorption of

Assynt, lime-stone formations at, de-
scribed, 60.
Astronomical observations, 51, 293.
circles, improved method

of dividing, 136.
Athens, climate of, 71-school of, 77.
Atkinson, Mr. observations by, on Mr.
Lockhart's imaginary cube roots,
72, 309.

Atlantic, north, temperature of, 396.
Auguste de St. Hilaire, M. botanical
* observations by, 223.

Azotic gas, specific gravity of, 321.

B.

Babbage, C. Esq. on the calculation of
functions, 68.

Bakewell, Mr. account of a coal-field

near Manchester, by, 56.
Beaufoy, Col. astronomical and mag-
netical observations, by, 51, 133,
218, 293, 379-description, by, of an
instrument to measure and register
the rise and fall of the tide through
out the whole flow and ebb, 273.

Beaufoy, Henry, Esq. instrument, by,
to ensure the attention of watchmen,
418.

Beauvois, M. de, observations on
plants, by, 148.

Bended tabular rents, junction of, 43.
Bennett, Hon. Henry Grey, account of
Teneriffe, by, 57.

Benzenburg, Dr. on the recovery of the
Aachen mass of native iron, 53.
Berneaux, M. Thiebaud de, botanical
observations, by, 225.

arrangement of the

human species 151.

Boracic acid, native, 71.

Bossut, Charles, biographical account
of, 401.

Brain, on the functions of, 136.
Brewster, Dr. on the multiplication of
images and colours which accompany
them in some specimens of Iceland
spar, 68-on the new properties of
light exhibited in the optical pheno-
mena of mother-of-pearl, and other
bodies to which the superficial struc-
ture of that substance can be com-
municated, 135-on the effect of
heated and cooled glass on light,
136, 219-on the depolarization of
light, 220-on pressure, 221-on the
polarization of light by reflection
from different transparent bodies,
222.

Brotero, Don Felix, on the genus
passiflora, 455.

Bucholz, Professor, experiments on
tungsten, by, 198.

C.

Cambridge, objects of study at that
University, 294.

Camera lucida, new and important
combinations with, 281,

Canaries, population of, 396.
Carbonate of bismuth, 236, 315.

Carbo-sulphuret of mercury, 237.
Carbureted hydrogen gas in coal-mines,
origin of, 172-why not kindled by
sparks, 236.

Carlisle, Anthony, Esq. on the con-
nexion between the extra-vascular
and vascular parts of animals, 68,
174.

Chalcedony, on vegetable remains in,
65.

Charcoal, absorption of gas by, 242.
Children, J. G. Esq. on the effects of a
very large galvanic battery, 68.
Chloric acid, 128.

Chlorine, observations on, 124-objec-
tions to Davy's theory of, 211.
Chloro-cyanic acid, 470.

Christison, Professor, on fluxions, 178,
420.

Cinchona, specimens of, 455,

Clanny, Dr. Reid, account of the Sun-
derland lime formation, by, 115.
Clift, Mr. William, on the influence of
the spinal marrow on the action of
the heart of fishes, 222.
Cloportæ, respiratory organs of, 227.
Clovelly, North Devon, account of,
64.

Coal-field at Bradford, near Man-
chester, described, 56.

Coal gas, method of illuminating the
streets by, 17.

Coal-mines, on, 108-queries respect-
ing the ventilation of, 416.
Colours used in painting by the an-
cients, 222.

Conybeare, Rev. William, on the

origin of a remarkable class of
organic impressions occurring in
nodules in flint, 58-account of Clo-
velly, by, 64.

Cornwall, Royal Geological Society of,
466.

Coxe, Dr. John Redman, observations
on crystallization, by, 101.
Crystallization, observations on, 101.
Crystals, antiquity of the theory of,
463.

Cube roots of binomials, extraction of,
152-further observations on Mr.
Lockhart's extraction of, 309.
Cuvier on the mouths of fishes, 228,
Cyanogen gas, properties of, 470.

D.

Dalton's theory of chemical composi-
tion, observations on, 371.
Daniel, Mr. on solution, 454.
Davy, Sir Humphry, on iodine, 136-
on the combustion of the diamond,
139-on the colours used by the an-
cients, 222-his method of prevent-
ing explosions in coal-mines, 453. -

Fatty bodies, nature of, 156.
Fig, varieties of, 224.

Flax, new mode of manufacturing,
230.

Fleming, Rev. Dr. on the mineralogy

of the Red Head, 142.

Floetz strata of England, older, re-
marks on, 20.

Fluo-arseniate of lime, 151.
Fluxions, observations ou, 178, 420-
queries respecting, 394-answers to,
464.

Fœtus, on the envelopes of, 226.
Fossil remains of an animal most
nearly allied to fishes, 139.

Fox, James, jun. Esq. register of the
weather in Plymouth for six months,
by, 366.

Fucus vesiculosus, 396.

Galvanic battery, very large, effects'
of, 68-elementary, described, 209.
experiment, new, 234.
Gases, absorption of, by different
bodies, 241-by liquids,, 33S.
Gay-Lussac, observations, by, on chlo-
rine, 124.

Gehlen, A. F. death of, 392.

Geological Society, Transactions of,
56-meetings of, 140.

Glass, heated, effects of, on light, 136.
Gough, Mr. John, on the collision of
hard bodies, 414.

Great

Britain, rapid

through, 312.

intercourse

Groombridge, Stephen, Esq. on atmos-
pherical refraction, 135.

Guglielmini seems to have had some no-
tion of the structure of crystals, 463.
Gum-arabie, analysis of, 431.

H.

Hard bodies, on the collision of, 414.
Heart, action of, experiments to de-
termine on what it depends, 221.
Heat, animal, some experiments on,
140.

Hemp, new mode of manufacturing,
230.

Henry, Dr. confirms Mr. Rose's disco-
very that urea is wanting in urine in
hepatitis, 392-on bleaching by oxy-
muriatic acid, 421.

Mr. Thomas, his experiments
on bleaching with oxymuriatic acid,
422.
Herschell, Dr. on the satellites of the
Georgium Sidus, 68.

Hey, Dr. Richard, on some properties
of tangents to circles, &c. 135.
Home, Sir Everard, on the respiration

of certain vermes that live in water,
69 on the mode of generation of the
lamprée and mixine, 68-on the
functions of the brain, 136-on the
fossil remains of an animal allied to
fishes, 139-on the influence of the
nerves on the action of the arteries,
139.

Horner, W. G. Esq. on new and im-
portant combinations with the ca-
mera lucida, 281.

Huel Peever, account of, 141.
Hydro-cyanic acid, 469.

Hydrogen gas, specific gravity of, 322.
Hydrophane, absorption of gases by
251.

Jameson, Professor, on the old red
1 sand-stone formation, 13-on the
places where fossil elephants have

Labradore, notices relative to the
geology of, 63,

Lamouroux, M. on the algae, 149.
Latreille, M. on the respiratory organs
of the cloportæ, 227.

Linnæan Society, meetings of, 70, 455.
Lockart, Mr. imaginary cube roots of,

observations on, 72-on the extrac-
tion of the cube roots of binomials,
152.
London bridge, numbers that pass over
it in a day, 71.

Longmire, Mr. John B. on rents, 43,
213, 411-on the origin of carbu
reted hydrogen gas in coal-mines,

172.

Mammoth, tooth of, discovered in
Hudson's Bay, 142.

ma, analysis of, 431.