The Origin of the Species by Natural Selection

The sixth London edition, with all editions and corrections. Considered the definitive edition. the Introduction begins: "When on board H.M.S. Beagle, as naturalist, I was much struck with certain facts in the distribution of the organic beings inhabiting South
America, and in the geological relations of the present to the past inhabitants of
that continent. These facts, as will be seen in the latter chapters of this volume, seemed to throw some light on the origin of species--that mystery o...