Author's Preface
first edition, a second became necessary; during the following year, a third, and the year afterwards a fourth. When issuing the last, my publisher proposed that I should prepare a cheap popular edition, at a much lower price, in order to give it as wide a circulation as possible. This end could be attained only by giving the work a much plainer dress and by making the edition unusually large. As even the previous editions had exceeded the ordinary size, and as the foreign market for the work grew smaller and smaller, by reason of the numerous translations made of it, I did not venture to believe that a fifth edition would become necessary. But the fact that a fifth edition is called for, is proof to me that this little book owed its success, on its first appearance, not to the charm of novelty, but to the conviction of a very large circle of people, that the fundamental view here advocated is correct; and in this belief I am strengthened by the many translations of it which have been made.
The following translations appeared in 1874:
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