[SCIENCE]. DARWIN, Charles (1809?1882). On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. New York: D. Appleton and Company, 1861. 8vo. Half?title, folding diagram; 1pp. publisher?s ad at end. Original green pebbled cloth, gilt?lettered spine, yellow endpapers (few light spots of surface rubbing on upper cover, else fine). FIRST AMERICAN EDITION, fourth printing ?considerably altered,? including seven pages placed at the end of author?s additions and alterations, and it contains the historical sketch in its earlier and shorter form as a Preface. Freeman 380.