Darwin, Charles. THE ORIGIN OF SPECIES. By Means of Natural Selection. Or the Preservation of Favoured Races in the Struggle for Life. By Charles Darwin. A reprint of the Sixth Edition with a Preface by Sir Gavin de Beer. Pott 8vo, Fourth Edition of this version; pp. xxxii, 592; full-page diagram, glossary, index; original cloth; a very good copy in worn dustwrapper. London; Oxford University Press; (1963).