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Antarctic scientific Expedition, pro- posed by tlie British Association and the Royal Society to Her Ma- jesty's Government, 169, 252, 401.

, hints and instructions drawn up

for the guidance of the, 169, 253.

seas, a vessel sent out by Mr. Enderby for the purposes of disco- very in the, 253.

Arachnida, on the circulation of the blood in the, 458.

Archil, chemical history of, 233, 337.

Ardwick, description of the observa- tory at, 371.

Arseniates, on the, 162.

Assafcetida, resin of, 219, 241.

Astacus marinus, on the organ of hear- ing of, 472.

Astronomical refractions, on, 60.

clock, description of an, 221.

Atkinson (J.) on a rain table and map, 221.

Atmosphere, on the transparency of the, and the law of extinction of the solar rays in passing through it, 389.

Atmospheric pressure, influence of the moon on the, 395.

Attractions, on calculations of, 289.

Aurora Australis, notices of the, in March 1841, 395.

Aurora borealis, geometrical measure- ment of the height of, 162.

— -, on the phenomena of the, 230.

, on a remarkable appearance of

the, 382.

Azoerythrine, chemical examination

of, 233, Azolitmine, 234.

Azote, the equivalent numbers of, 123.

Baily (F.), description of a new baro- meter fixed up in the apartment of the Royal Society, with an account of the mode now adopted for cor- recting the observed height of the mercury, 1.

Bakerian Lecture : Mr. Ivory on the theory ofastronomicalrefractions,60.

— —, Mr. W. Snow Harris on the elementary laws of electricity, 156.

Mr. Airy on the theoretical ex- planation of an apparently new po- larity of light, 239.

— —, Mr. G. Newport on the organs of reproduction, and on the develop- ment of the Myriapoda, 326.

Prof. J. D. Forbes on the transparency of the atmosphere, and the law of extinction of the solar rays in passing through it, 389. Barometer, description of a new one, fixed up in the apartments of the Royal Society, 1.

, on the mode in which observa- tions have been recorded in the Meteorological Journal of the So- ciety, 2.

, the Society's, its height above the

mean level of the sea, 2.

, compensating, description of a, 133.

, hourly observations at sea of

the, 239.

, on variations of the mean height

of, 21 1, 226. on a cycle of eighteen years in the mean annual height of the, 292. , on a remarkable depression of

the, 292.

, on an irregularity in the height

of the, 295.

■ ' ■ and thermometer, Coggan's, 72.

Barometrical observations taken at Naples, 303.

observations at Yarmouth, 369.

observations, showing the effect

of the direction of the wind on the difference between distant barome- ters, 386.

Baroscope, hydropneumatic, descrip- tion of a, 126.

Barrow (Sir J.), magnetic observa- tions, 220.

Barry (Dr. M.), researches in embry- ology, 73^ 136, 222, 279.

, a Royal medal awarded to, 172.

on the corpuscles of the blood,

234, 283, 323, 462.

, a contribution to the physiology

of cells, 222, 279.

on the discovery of the germinal

spot in the mammiferous ovum, 279.

on the chorda dorsalis, 282.

on fibre, 362, 384, 431.

, spermatozoa observed within the

mammiferous ovum, 432.

on fossiparous generation, 441.

, note on the observations of T.

W. Jones, Esq., 462.

Batten (Rev. Dr. J. H.), notice of the late, 15.

Bauer (F.), biographical notice of, 342.

Bdellium, resin of, 241.

Becquerel (M.), the Copley medal