My Publishers inform me that the thousand copies of this work, printed a few months ago, have been sold, and that a second edition is called for.
In preparing it for the press, I have carefully revised every sentence, and have made such alterations and additions as seemed desirable, in order to bring out more clearly my meaning, and to meet suggestions for which I am indebted to various reviewers. That appeared to me the best way of manifesting my appreciation of the favour shown to a volume, which, as I am fully conscious, little accords with the dominant tone of what is called "public opinion."