My warmest thanks are offered to Sir Francis Darwin for permission to use his father's letters, for his annotations, and for rendering help in checking the typescript of the Darwin letters; to Mr. John Murray, C.V.O., for permission to use letters and notes from the "Life and Letters of Charles Darwin" and from "More Letters"; to Messrs. Chapman and Hall for their great generosity in allowing the free use of letters and material in Wallace's "My Life"; to Prof. E.B. Poulton, Prof. Sir W.F. Barrett, Sir Wm. Thiselton-Dyer, Dr. Henry Forbes, and others for letters and reminiscences; and to Prof. Poulton for reading the proofs and for valuable suggestions. An intimate chapter on Wallace's Home Life has been contributed by his son and daughter, Mr. W.G. Wallace and Miss Violet Wallace. J.M. _March, 1916._ CONTENTS Volume I INTRODUCTION PART I I. WALLACE AND DARWIN--EARLY YEARS II. EARLY LETTERS (1854-62) PART II I. THE DISCOVERY OF NATURAL SELECTION II. THE COMPLETE EXTANT CORRESPONDENCE BETWEEN WALLACE AND DARWIN (1857-81) Volume II PART III I. WALLACE'S WORKS ON BIOLOGY AND GEOGRAPHICAL DISTRIBUTION II. CORRESPONDENCE ON BIOLOGY, GEOGRAPHICAL DISTRIBUTION, ETC. (1864-93) III. CORRESPONDENCE ON BIOLOGY, GEOGRAPHICAL DISTRIBUTION, ETC. (1894-1913) PART IV HOME LIFE PART V SOCIAL AND POLITICAL VIEWS PART VI SOME FURTHER PROBLEMS I. ASTRONOMY II. SPIRITUALISM PART VII CHARACTERISTICS APPENDIX: LISTS OF WALLACE'S WRITINGS INDEX LIST OF PLATES IN VOLUME I A.R. WALLACE (1912) A.R. WALLACE (SINGAPORE, 1862) A.R. WALLACE'S MOTHER A.R. WALLACE SOON AFTER HIS RETURN FROM THE EAST Alfred Russel Wallace Letters and Reminiscences INTRODUCTION In Westminster Abbey there repose, almost side by side, by no conscious design yet with deep significance, the mortal remains of Isaac Newton and of Charles Darwin. "'The Origin of Species,'" said Wallace, "will live as long as the 'Principia' of Newton." Near by are the tombs of Sir John Herschel, Lord Kelvin and Sir Charles Lyell; and the medallions in memory of Joule, Darwin, Stokes and Adams have been rearranged so as to admit similar memorials of Lister, Hooker and Alfred Russel Wallace. Now that the plan is completed, Darwin and Wallace are together in this wonderful galaxy of the great men of science of the nineteenth century. Several illustrious names are missing from this eminent company; foremost amongst them being that of Herbert Spencer, the lofty master of that synthetic philosophy which seemed to his disciples to have the proportions and qualities of an enduring monument, and whose incomparable fertility of creative thought entitled him to share the throne with Darwin. It was Spencer, Darwin, Wallace, Hooker, Lyell and Huxley who led that historic movement which garnered the work of Lamarck and Buffon, and gave new direction to the ceaseless interrogation of nature to discover the "how" and the "why" of the august progression of life.