32 p. publisher's catalogue at rear of vol. I dated February, 1871. 2 p. publisher's list at rear of vol. II dated February, 1868. One line Erratum to vol. I and no errata to vol. II. Incudes the first appearance of the phrase "survival of the fittest" in any of Darwin's works, on p. 6 of vol. I, where he gives credit for the phrase to Herbert Spencer. A large part of the book contains discussion of artificial selection and pangenesis, the mechanism he suggested to explain heredity.
