Plant-Animals: a Study in Symbiosis. By Prof. F. W. Keeble. Plant-Life on Land. By Prof. F. O. Bower, Sc.D., F.R.S. Links with the Past in the Plant-World. By Prof. A. C. Seward. _PHYSICS_ The Earth. By Prof. J. H. Poynting, F.R.S. The Atmosphere. By A. J. Berry, M.A. The Physical Basis of Music. By A. Wood, M.A. _PSYCHOLOGY_ An Introduction to Experimental Psychology. By Dr C. S. Myers. The Psychology of Insanity. By Bernard Hart, M.D. _INDUSTRIAL AND MECHANICAL SCIENCE_ The Modern Locomotive. By C. Edgar Allen, A.M.I.Mech.E. The Modern Warship. By E. L. Attwood. Aerial Locomotion. By E. H. Harper, M.A., and Allan E. Ferguson, B.Sc. Electricity in Locomotion. By A. G. Whyte, B.Sc. The Story of a Loaf of Bread. By Prof. T. B. Wood, M.A. Brewing. By A. Chaston Chapman, F.I.C. SOME VOLUMES IN PREPARATION _HISTORY AND ARCHAEOLOGY_ The Aryans. By Prof. M. Winternitz. The Peoples of India. By J. D. Anderson. Prehistoric Britain. By L. McL. Mann. The Balkan Peoples. By J. D. Bourchier. The Evolution of Japan. By Prof. J. H. Longford. The West Indies. By Sir Daniel Morris, K.C.M.G. The Royal Navy. By John Leyland. Gypsies. By John Sampson. English Monasteries. By A. H. Thompson, M.A. A Grammar of Heraldry. By W. H. St John Hope, Litt.D. Celtic Art. By Joseph Anderson, LL.D. _LITERARY HISTORY_ The Book. By H. G. Aldis, M.A. Pantomime. By D. L. Murray. Folk Song and Dance. By Miss Neal and F. Kitson. _PHILOSOPHY AND RELIGION_ The Moral and Political Ideas of Plato. By Mrs A. M. Adam. The Beautiful. By Vernon Lee. _ECONOMICS_ The Theory of Money. By D. A. Barker. Women's Work. By Miss Constance Smith. _EDUCATION_ German School Education. By Prof. K. H. Breul, Litt.D. The Old Grammar Schools. By Prof. Foster Watson. _PHYSICS_ Beyond the Atom. By Prof. J. Cox. The Sun. By Prof. R. A. Sampson. Wireless Telegraphy. By C. L. Fortescue, M.A. Röntgen Rays. By Prof. W. H. Bragg, F.R.S. _BIOLOGY_ Bees and Wasps. By O. H. Latter, M.A. The Life-story of Insects. By Prof. G. H. Carpenter. The Wanderings of Animals. By H. F. Gadow, M.A., F.R.S. _GEOLOGY_ Submerged Forests. By Clement Reid, F.R.S. Coast Erosion. By Prof. T. J. Jehu. _INDUSTRIAL AND MECHANICAL SCIENCE_ Coal Mining. By T. C. Cantrill. Leather. By Prof. H. R. Procter. Cambridge University Press C. F. Clay, Manager London: Fetter Lane, E.C. Edinburgh: 100, Princes Street Transcriber's Notes Obvious errors of punctuation and diacritics repaired. Inconsistent hyphenation fixed. P. 67: Murray -> Moray. P. 147: Nordisk Aaandsliv -> Nordisk Aandsliv. P. 148: Cnut, 42-2 -> Cnut, 41-2. End of the Project Gutenberg EBook of The Vikings, by Allen Mawer