The International Scientific Series-continued.

LXVII. PHYSIOLOGY of BODILY EXERCISE. BY FERNAND LAGRANGE, M.D. Second Edition.

LXVIII. The COLOURS of ANIMALS: their Meaning and Use, especially considered in the case of Insects. By E. B. POULTON, F.R.S. With Chromolithographic Frontispiece and upwards of 60 Figures in Text, Second Edition.

LXIX. INTRODUCTION to FRESH-WATER ALGA. With
an Enumeration of all the British Species. By M. C. COOKE, LL.D. With
13 Plates Illustrating all the Genera.

LXX. SOCIALISM: NEW and OLD. BY WILLIAM GRAHAM,
M.A., Professor of Political Economy and Jurisprudence, Queen's College,
Belfast. Second Edition.

LXXI. COLOUR-BLINDNESS and COLOUR-PERCEPTION.
By F. W. EDRIDGE-GREEN, M.D. With 3 Coloured Plates.

LXXII. MAN and the GLACIAL PERIOD. By G. F. WRIGHT,
D.D. With 111 Illustrations and Maps. Second Edition.
LXXIII. HANDBOOK of GREEK and LATIN PALEO-
GRAPHY. By Sir E. MAUNDE THOMPSON, K.C.B. With Tables of
Alphabets and Facsimiles. Second Edition.

LXXIV. A HISTORY of CRUSTACEA: Recent Malacostraca.
By THOMAS R. R. STEBBING, M.A. With 19 Plates and 32 Figures in
Text.

LXXV. The DISPERSAL of SHELLS: an Inquiry into the means of Dispersal possessed by Fresh Water and Land Mollusca. By H. WALLIS KEW, F.Z.S. With Preface by A. R. WALLACE, F.R.S., and Illustrations.

LXXVI. RACE and LANGUAGE. BY ANDRÉ LEFÈVRE, Professor in the Anthropological School, Paris.

LXXVII. The ORIGIN of PLANT STRUCTURES by SELFADAPTATION TO THE ENVIRONMENT. By Rev. G. HENSLOW, M.A., F.L.S., F.G.S., &c., author of 'The Origin of Floral Structures,' &c. LXXVIII. ICE-WORK PRESENT and PAST. By Rev. T. G. BONNEY, D.Sc., LL.D., F.R.S., &c., Professor of Geology at University College, London; Fellow of St. John's College, Cambridge.

LXXIX. A CONTRIBUTION to our KNOWLEDGE

SEEDLINGS. By Lord AVEBURY.

of

LXXX. The ART of MUSIC. By Sir C. HUBERT H. PARRY, Mus. Doc. LXXXI. The POLAR AURORA. By ALFRED ANGOT. Illustrated. LXXXII. WHAT is ELECTRICITY? By J. TROWBRIDGE. Illustrated. LXXXIII. MEMORY. By F. W. EDRIDGE-GREEN, M.D. With Frontispiece.

LXXXIV. The ELEMENTS of HYPNOTISM.

By R. HARRY

VINCENT. With Diagrams. Second Edition. LXXXV. SEISMOLOGY. By JOHN MILNE, F.R.S., F.G.S., &c., Author of Earthquakes.' With 53 Figures.

LXXXVI. On BUDS and STIPULES. By Lord AVEBURY, F.R.S., D.C.L., LL.D. With 4 Coloured Plates and 340 Figures in the Text.

LXXXVII. EVOLUTION by ATROPHY, in Biology and Sociology. By JEAN DEMOOR, JEAN MASSART, and EMILE VANDERVELDE. Translated by Mrs. CHALMERS MITCHELL. With 84 Figures.

LXXXVIII. VARIATION in ANIMALS and PLANTS. By H. M. VERNON, M.A., M.D.

London: KEGAN PAUL, TRENCH, TRÜBNER, & CO., LTD.

ICE-WORN ROCKS IN THE GORGE OF THE AAR BELOW THE GRIMSEL HOSPICE. (From a photograph by J. Eccles, Esq., F.G.S.)