On the origin of species by means of natural selection, or the preservation of favoured races in the struggle por life. By Charles Darwin, M. A., Fellow of the Royal, Geological, Linnaean, etc. Societies; author of Journal of Researches during H. M. S. Beagle's voyage round the world. A new edition, revised and augmented by the author - Darwin Charles (D. Appleton and Company, 443 & 445 Broadway, 1864)