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INDEX TO THE FIRST VOLUME. Abra, pleistocene species of, 409 Academy for Miners in Saxony, 486 Accumulations, kind of, at the mouths of rivers in tideless seas, 8 Accumulations, volcanic and ordinary in deep seas, 3 Actinic force, magnetism probably due to, 458 Administration of Mines in France, 496 Adolphe Brongniart, his opinion respecting the origin of coal, 152 Agassiz, Professor, on the glacial epoch, 400 Aikin, Dr., bis notice of peculiar bed beneath coal, 147 Airy, Professor, on terrestrial magnetism, 458 Algae, their distribution, 353; pelagic, species of, 349 ; their range in depth, 374 ; coast-line species of, 373 Altenberg and Zinnwald, 489 America, North, Mollusca of, 367, 378, 380 ; zoology of, 382, 396 Ampere, M., theory of, 434 Analysis of cornstone and red marls asso ciated with it, from the old red sand stone of Milford Haven, 63 Analysis of Wenlock limestone of May Hill, 39 ; of red and gray marls of old red sandstone, 54 Ancient coast, its extent, 320 Ancient land around which the coal mea sures accumulated, 314 Ancient lines of coast and coast cliffs, 331 • Annales des Mines,’ publication of, 497 Annellida, pleistocene species of. 431 Anomia, pleistocene species of, 420 Anthracite of South Wales, 217; passage of, into bituminous coal. 217 ; remarks upon the passage, 219 ; artificial, 220 Anthracitic mines, explosive gas of, 477 Antimony, diamagnetic character, 445 Aporrhais, pleistocene species of. 423 Arbor Diance, arrangement under magnetic influence, 439 Artemis, pleistocene species of, 414 Articulata, British marine, 355 ; fossil, 430 Asaphus Buchii, abundance of, in parts of South Wales, 31 Ashes, volcanic, distribution of, 2 Astarte, pleistocene species of, 412 Asturias, relation of its flora to that of Ireland, 347 Atlantic breakers, their ancient effects on Wales and its neighbourhood, 333 Atmosphere, supposed greater abundance of carbonic acid in, during early geolo gical times, 36 Atmospheric influences and the power of running water, their effects on the sur face, 332 Aust Cliff, Severn, section of new red marls and lias of, 253 Austen, his labours respecting South Devo nian rocks, 87 ; his list of organic re mains found in Newton Quarry, 88; discovered organic remains in volcanic ash of South Devonian rocks, 90 ; re marks on the coral reef character of South Devon limestones, 93 ; on habits of the marine animals of the time, ib. Austrian Miner, condition of, 491 Balanus, pleistocene species of, 430 Bampton, passage of Pilton Group into carbonaceous rocks near, 136 Barry Island, Glamorganshire, dolomitic conglomerate and new red sandstone of, 245 Bars, mode of formation of, 15 Bath-brick laminated by electricity, 453 Beach character of certain conglomerates of Silurian date near Builth, 36 Becquerel, M., on the chemical power of voltaic current, 455 Bensham Seam, Hebburn Pit, analysis of gas from, 472 Bensham Seam, Jarrow, analysis of gas from, 471 Binney, Mr., on a bank thrown up by the sea, 478 Bischoff, researches of, 460 Bismuth, chloride of, diamagnetic character of, 445 Bismuth, nitrate of, diamagnetic character of, 445 Black limestones and associated beds of Muddlebridge, North Devon, 135 ; diffi culty of drawing a boundary line between these beds and the Pilton Group, ib.; 2 M