=Elementary Course of Geology, Mineralogy, and Physical Geography.= By DAVID T. ANSTED, M.A., F.R.S., F.G.S., &c., Consulting Mining Engineer, Honorary Fellow of King’s College, London, Lecturer on Mineralogy and Geology at the H.E.I.C. Mil. Sem. at Addiscombe, late Fellow of Jesus College, Cambridge. A Second Edition, post 8vo, with many Illustrations, 12_s._ =The Ancient World.= By Professor ANSTED. Second Edition, post 8vo, 10_s._ 6_d._, with 149 Illustrations. “The work may be described as an outline of the history of vegetable and animal life upon the globe, from the early age when there were only sea-weeds and marine invertebrates as yet in existence, down to the era when the mammals received among them the king of species, Man. By his intimate acquaintance with the subject, and power of arrangement and description, Professor Ansted succeeds in producing a narration, which tells in its entire range like a romance.”--_Manchester Examiner._ =Gold-Seeker’s Manual.= By Professor ANSTED. Foolscap 8vo, 3_s._ 6_d._ =Geologist’s Text-Book.= Chiefly intended as a Book of Reference for the Geological Student. By Professor ANSTED. Foolscap 8vo, 3_s._ 6_d._ =The Ground beneath us;= its Geological Phases and Changes. Three Lectures on the Geology of Clapham and the neighbourhood of London generally. By JOSEPH PRESTWICH, F.R.S., F.G.S., &c. 8vo, 3_s._ 6_d._ sewed. =Geological Inquiry respecting the Water-bearing Strata= of the Country around London, with reference especially to the Water Supply of the Metropolis, and including some Remarks on Springs. By JOSEPH PRESTWICH, F.G.S., &c. 8vo, with a Map and Woodcuts, 8_s._ 6_d._ =Manual of the Mineralogy of Great Britain and Ireland.= By ROBERT PHILIPS GREG, F.G.S., and WILLIAM G. LETTSOM. 8vo, with numerous Woodcuts, 15_s._ =History of British Fossil Mammals and Birds.= By Professor OWEN. This volume is designed as a companion to that by Professor Bell on the (Recent Mammalia) ‘British Quadrupeds and Cetacea.’ 8vo, with 237 Illustrations. £1 11_s._ 6_d._, or large paper (royal 8vo), £3 3_s._ =Description of the Skeleton of an Extinct Gigantic Sloth= (Mylodon robustus). With Observations on the Osteology, Natural Affinities, and probable Habits of the Megatherioid Quadrupeds in general. By RICHARD OWEN, F.R.S., &c. 4to, £1 12_s._ 6_d._ =Memoirs of Hugh E. Strickland, M.A.,= Deputy Reader of Geology in the University of Oxford. By SIR WILLIAM JARDINE, Bart.; with a selection from his Printed and other Scientific Papers. Royal 8vo, Illustrated by Maps, Geological Sections, Plates and Woodcuts, 36_s._ =Omphalos.= An Attempt to Untie the Geological Knot. By P. H. GOSSE, F.R.S. The law of Prochronism in organic creation. Post 8vo, with 56 Illustrations on wood, 10_s._ 6_d._ GENERAL NATURAL HISTORY, &c.