XXVIII. THE GROWTH OF THE BRAIN: A STUDY OF THE NERVOUS SYSTEM IN RELATION TO EDUCATION. By HENRY HERBERT DONALDSON, Professor of Neurology in the University of Chicago. 3s. 6d. "We can say with confidence that Professor Donaldson has executed his work with much care, judgment, and discrimination."--_The Lancet._ XXIX. EVOLUTION IN ART: AS ILLUSTRATED BY THE LIFE-HISTORIES OF DESIGNS. By Professor ALFRED C. HADDON. With 130 Illustrations. 6s. "It is impossible to speak too highly of this most unassuming and invaluable book."--_Journal Anthropological Institute._ XXX. THE PSYCHOLOGY OF THE EMOTIONS. By TH. RIBOT, Professor at the College of France, Editor of the _Revue Philosophique_. 6s. "Charmingly written, and full of lucid explanation and brilliant comparison. A masterly exposition."--_British Medical Journal._ XXXI. HALLUCINATIONS AND ILLUSIONS: A STUDY OF THE FALLACIES OF PERCEPTION. By EDMUND PARISH. 6s. "The most comprehensive and most scientific work on false perception that has up till now been written in any language."--_Journal of Mental Science._ XXXII. THE NEW PSYCHOLOGY By E. W. SCRIPTURE, Ph.D. (Leipzig). With 124 Illustrations. 6s. "We have at present no work in English which gives in so compact a form so comprehensive a view of the subject."--_Liverpool Post._ XXXIII. SLEEP: ITS PHYSIOLOGY, PATHOLOGY, HYGIENE, AND PSYCHOLOGY. By MARIE DE MANACÉÏNE (St. Petersburg). Illustrated. 3s. 6d. "The book is a complete and wonderfully interesting exposition, and as such ought to receive a hearty welcome."--_Scotsman._ XXXIV. THE NATURAL HISTORY OF DIGESTION. By A. LOCKHART GILLESPIE, M.D., F.R.C.P. ED., F.R.S. ED. With a large number of Illustrations and Diagrams. 6s. XXXV. DEGENERACY: ITS CAUSES, SIGNS, AND RESULTS. By Professor EUGENE S. TALBOT, M.D., Chicago. With Illustrations. 6s. _THE CONTEMPORARY SCIENCE SERIES_ EDITED BY HAVELOCK ELLIS DEGENERACY [Illustration: DWARFISM AND GIANTISM.] DEGENERACY _ITS CAUSES, SIGNS, AND RESULTS_ BY EUGENE S. TALBOT, M.D., D.D.S., FELLOW OF THE CHICAGO ACADEMY OF MEDICINE; MEMBER OF THE CHICAGO ACADEMY OF SCIENCES; HONORARY MEMBER OF THE BERLIN ODONTOLOGISCHEN GESELLSCHAFT, AND THE ASSOCIATION GÉNÉRALE DES DENTISTES DE FRANCE; PROFESSOR OF DENTAL AND ORAL SURGERY, WOMAN'S MEDICAL SCHOOL, NORTH-WESTERN UNIVERSITY, U.S.A. WITH 120 ILLUSTRATIONS LONDON WALTER SCOTT, LTD., PATERNOSTER SQUARE 1898 PREFACE