in the present volume.
Mr. Darwin generally wrote his letters when he was tired or hurried, and this often led to the omission of words. We have usually inserted the articles, and this without any indication of their absence in the originals. Where there seemed any possibility of producing an alteration of meaning (and in many cases where there is no such possibility) we have placed the introduced words in square brackets. We may say once for all that throughout the book square brackets indicate words not found in the originals. (Preface/2. Except in a few places where brackets are used to indicate passages previously published. In all such cases the meaning of the symbol is explained.) Dots indicate omissions, but many omissions are made without being so indicated.
The selection and arrangement of the letters have not been easy. Our plan has been to classify the letters according to subject--into such as deal with Evolution, Geographical Distribution, Botany, etc., and in each group to place the letters chronologically. But in several of the chapters we have adopted sectional headings, which we believe will be a help to the reader. The great difficulty lay in deciding in which of the chief groups a given letter should be placed. If the MS. had been cut up into paragraphs, there would have been no such difficulty; but we feel strongly that a letter should as far as possible be treated as a whole. We have in fact allowed this principle to interfere with an accurate classification, so that the reader will find, for instance, in the chapters on Evolution, questions considered which might equally well have come under Geographical Distribution or Geology, or questions in the chapter on Man which might have been placed under the heading Evolution. In the same way, to avoid mutilation, we have allowed references to one branch of science to remain in letters mainly concerned with another subject. For these irregularities we must ask the reader's patience, and beg him to believe that some pains have been devoted to arrangement.
Mr. Darwin, who was careful in other things, generally omitted the date in familiar correspondence, and it is often only by treating a letter as a detective studies a crime that we can make sure of its date. Fortunately, however, Sir Joseph Hooker and others of Darwin's correspondents were accustomed to add the date on which the letters were received. This sometimes leads to an inaccuracy which needs a word of explanation. Thus a letter which Mr. Darwin dated "Wednesday" might be headed by us "Wednesday [January 3rd, 1867]," the latter half being the date on which the letter was received; if it had been dated by the writer it would have been "Wednesday, January 2nd, 1867."
In thanking those friends--especially Sir Joseph Hooker and Mr. Wallace-- who have looked through some of our proof-sheets, we wish to make it clear that they are not in the smallest degree responsible for our errors or omissions; the weight of our shortcomings rests on us alone.
We desire to express our gratitude to those who have so readily supplied us with information, especially to Sir Joseph Hooker, Professor Judd, Professor Newton, Dr. Sharp, Mr. Herbert Spencer, and Mr. Wallace. And we have pleasure in mentioning Mr. H.W. Rutherford, of the University Library, to whose conscientious work as a copyist we are much indebted.
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.
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