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SMYTH (Captain William Henry) A CYCLE OF CELESTIAL OBJECTS, Vol. I., Prolegomena, 516 pp., with about 50 engravings; Vol. II., the Bedford Catalogue, 560 pp., with about 60 engravings of nebulæ, etc., 2 vols., 8vo, cloth, uncut, scarce, 1844, £3 3s.

This is the original and best edition. The reprint (1881) contains the Bedford Catalogue; that is one volume only of the Cycle.

SOWERBY (J.) British Mineralogy, 550 coloured plates, with descriptions of the Minerals of Great Britain, 5 vols., royal 8vo, half-calf, 1804-17, £6.

SUSSEX.—The Geology and Fossils of the Tertiary and Cretaceous Formations of Sussex, by the late FREDERICK DIXON, Esq., F.G.S.; new edition, revised and augmented by T. RUPERT JONES, F.R.S., F.G.S., aided by PROFESSOR OWEN, C.B., Sir P. de M. Grey-Egerton, Bart., M.P., Prof. T. Bell, F.R.S., W. Carruthers, F.R.S., T. Davidson, F.R.S., R. Etheridge, F.R.S., J. Evans, F.R.S., Prof. J. Morris, F.G.S., E. T. Newton, F.G.S., W. J. Sollas, F.G.S., Henry Woodward, F.R.S., T. Wright, F.R.S., and others, pp. 24 and 462, with Geological Map and Section of Borings, also 64 sheets of fine plates of Fossils, including a selection from those published in 'Mantell's Fossils of the South Downs,' new edition, royal 4to, cloth, Brighton, 1878, £2 15s.

WADSWORTH (M. E.) Lithological Studies—A Description and Classification of the Rocks of the Cordilleras, with 8 plates, containing 48 coloured sections, 4to, Cambridge, U.S., 1884, £1 10s.

The plates are beautiful microscopical enlargements of thin sections of the rocks.