This year marks the 150th anniversary of the publication of Charles Darwin’s On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life. In his landmark study, Darwin theorized that populations evolve over the course of generations through a process of natural selection. These ideas flew in the face of long-held beliefs, and the book immediately became one of the most controversial scientific works in history—and it still remains so today. Now, for the first time, Darwin’s classic is fully and handsomely illustrated with more than 350 illustrations and photos, many of them in brilliant color. Reproductions from Darwin’s The Voyage of the Beagle, his journal of the travels that led to his remarkable breakthrough, appear throughout, inviting readers to experience Darwin’s journey and to understand how he developed his theory of evolution. In addition, brief excerpts from his letters, diaries, and correspondence bring both Darwin the man and his revolutionary discovery to life.  A Main Selection of Scientific America.