. The dispersal of shells, an inquiry into the means of dispersal possessed by fresh-water and land Mollusca. NT. By C. N. PHYSIOLOGY of BODILY EXERCISE. By Fernanp Lagrange, Second The COLOURS of ANIMALS: their Meaning and Use,especially considered in the case of Insects. By E. B. Poulton, Chromolithographic Frontispiece and upwards of 60 Figures in INTRODUCTION TO FRESH-WATER ALG.^. Withan Enumeration of all the British Species. By M. C. Cooke, With13 Plates Illustrating all the SOCIALISM: NEW AND OLD.
. The dispersal of shells, an inquiry into the means of dispersal possessed by fresh-water and land Mollusca. NT. By C. N. PHYSIOLOGY of BODILY EXERCISE. By Fernanp Lagrange, Second The COLOURS of ANIMALS: their Meaning and Use,especially considered in the case of Insects. By E. B. Poulton, Chromolithographic Frontispiece and upwards of 60 Figures in INTRODUCTION TO FRESH-WATER ALG.^. Withan Enumeration of all the British Species. By M. C. Cooke, With13 Plates Illustrating all the SOCIALISM: NEW AND OLD. By William Graham, Professor of Political Economy and Jurisprudence, Queens College,Belfast. Second COLOUR-BLINDNESS AND COLOUR-PERCEPTION. By F. W, Edridge-Green, With 3 Coloured MAN AND THE GLACIAL PERIOD. By G. , With 111 Illustrations and HANDBOOK OF GREEK AND LATIN PALEO-GRAPHY. By E. Maunde Thompson. With Tables of Alphabets andFacsimiles. London : KEGAN PAUL, TRENCH, TRUBNER, & CO., Ltd. INTERNATIONAL SCIENTIFIC SERIES VOL. LXXV,. PREFACE. Hardly any branch of natural history has been soneglected as that which treats of the various modes bywhich the different classes of organisms have becomedispersed over the surface of the globe. Scatteredobservations have indeed been made by many writers,but Lyell and Darwin were the first to gather togetherthe existing evidence on the subject, ol* to test byactual experiment the effects of exposure to salt wateron the vitality of seeds and land-shells. Owing to thisneglect the idea has arisen that seas of very moderatewidth serve as complete barriers to the dispersal ofmost living things ; and it has been thought necessaryto postulate great and often repeated geographicalmutations, and even to bridge across the widest anddeepest oceans, in order to account for the actual dis-tribution of mammals or reptiles, of plants, insects, orterrestrial mollusca. It was Darwin who f
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