Darwin, Charles. The Thinker's Library, No. 8. THE ORIGIN OF SPECIES by Means of Natural Selection. By Charles Darwin, LL.D. Last (Sixth) Edition. F'cap 8vo, First Edition in the Thinker's Library; pp. viii, 434, (adv.); full-page diagram, glossary, index; original printed papered boards; a nice copy. London; Watts & Co.; (1929).