The present edition of “Life and Habit” is practically a re-issue of that of 1878. I find that about the year 1890, although the original edition was far from being exhausted, Butler began to make corrections of the text of “Life and Habit,” presumably with the intention of publishing a revised edition. The copy of the book so corrected is now in my possession. In the first five chapters there are numerous emendations, very few of which, however, affect the meaning to any appreciable extent, being mainly concerned with the excision of redundancies and the simplification of style. I imagine that by the time he had reached the end of the fifth chapter Butler realised that the corrections he had made were not of sufficient importance to warrant a new edition, and determined to let the book stand as it was. I believe, therefore, that I am carrying out his wishes in reprinting the present edition from the original plates. I have found, however, among his papers three entirely new passages, which he probably wrote during the period of correction and no doubt intended to incorporate into the revised edition. Mr. Henry Festing Jones has also given me a copy of a passage which Butler wrote and gummed into Mr. Jones’s copy of “Life and Habit.” These four passages I have printed as an appendix at the end of the present volume. One more point deserves notice. Butler often refers in “Life and Habit” to Darwin’s “Variations of Animals and Plants under Domestication.” When he does so it is always under the name “Plants and Animals.” More often still he refers to Darwin’s “Origin of Species by means Natural Selection,” terming it at one time “Origin of Species” and at another “Natural Selection,” sometimes, as on p. 278, using both names within a few lines of each other. Butler was as a rule scrupulously careful about quotations, and I can offer no explanation of this curious confusion of titles. R. A. STREATFEILD. _November_, 1910. AUTHOR’S PREFACE. THE Italics in the passages quoted in this book are generally mine, but I found it almost impossible to call the reader’s attention to this upon every occasion. I have done so once or twice, as thinking it necessary in these cases that there should be no mistake; on the whole, however, I thought it better to content myself with calling attention in a preface to the fact that the author quoted is not, as a general rule, responsible for the Italics. S. BUTLER. _November_ 13, 1877. CONTENTS.