Finally, it is a pleasure to express our obligation to those who have helped us in the matter of illustrations. The portraits of Dr. Asa Gray, Mr. Huxley, Sir Charles Lyell, Mr. Romanes, are from their respective Biographies, and for permission to make use of them we have to thank Mrs. Gray, Mr. L. Huxley, Mrs. Lyell, and Mrs. Romanes, as well as the publishers of the books in question. For the reproduction of the early portrait of Mr. Darwin we are indebted to Miss Wedgwood; for the interesting portraits of Hugh Falconer and Edward Forbes we have to thank Mr. Irvine Smith, who obtained for us the negatives; these being of paper, and nearly sixty years old, rendered their reproduction a work of some difficulty. We also thank Messrs. Elliott & Fry for very kindly placing at our disposal a negative of the fine portrait, which forms the frontispiece to Volume II. For the opportunity of making facsimiles of diagrams in certain of the letters, we are once more indebted to Sir Joseph Hooker, who has most generously given the original letters to Mr. Darwin's family. Cambridge, October, 1902. TABLE OF CONTENTS. CONTENTS OF VOLUME I. Outline of Charles Darwin's Life, etc. CHAPTER 1.I.--An Autobiographical Fragment, and Early Letters, 1809-1842. CHAPTER 1.II.--Evolution, 1844-1858. CHAPTER 1.III.--Evolution, 1859-1863. CHAPTER 1.IV.--Evolution, 1864-1869. CHAPTER 1.V.--Evolution, 1870-1882. CHAPTER 1.VI.--Geographical Distribution, 1843-1867. ILLUSTRATIONS IN VOLUME I. CHARLES AND CATHERINE DARWIN, 1816. From a coloured chalk drawing by Sharples, in possession of Miss Wedgwood, of Leith Hill Place. MRS. DARWIN, 1881. From a photograph by Barraud. EDWARD FORBES, 1844 (?). From a photograph by Hill & Adamson. THOMAS HENRY HUXLEY, 1857. From a photograph by Maull & Fox. (Huxley's "Life," Volume I.) PROFESSOR HENSLOW. From a photograph. HUGH FALCONER, 1844. From a photograph by Hill & Adamson. JOSEPH DALTON HOOKER, 1870 (?). From a photograph by Wallich. ASA GRAY, 1867. From a photograph. ("Letters of Asa Gray," Volume I.) VOLUME II CHAPTER 2.VII.--Geographical Distribution, 1867-1882. CHAPTER 2.VIII.--Man, 1860-1882. 2.VIII.I. Descent of Man, 1860-1882. 2.VIII.II. Sexual Selection, 1866-1872. 2.VIII.III. Expression, 1868-1874. CHAPTER 2.IX.--Geology, 1840-1882. 2.IX.I. Vulcanicity and Earth-movements, 1840-1881. 2.IX.II. Ice-action, 1841-1882. 2.IX.III. The Parallel Roads of Glen Roy, 1841-1880. 2.IX.IV. Coral Reefs, Fossil and Recent, 1841-1881. 2.IX.V. Cleavage and Foliation, 1846-1856. 2.IX.VI. Age of the World, 1868-1877. 2.IX.VII. Geological Action of Earth-worms, 1880-1882. 2.IX.VIII. Miscellaneous, 1846-1878. CHAPTER 2.X.--Botany, 1843-1871. 2.X.I. Miscellaneous, 1843-1862. 2.X.II. Melastomaceae, 1862-1881. 2.X.III. Correspondence with John Scott, 1862-1871. CHAPTER 2.XI.--Botany, 1863-1881. 2.XI.I. Miscellaneous, 1863-1866. 2.XI.II. Correspondence with Fritz Muller, 1865-1881. 2.XI.III. Miscellaneous, 1868-1881.