- The Origins of Species: Introduction. By Charles Darwin.www.talkorigins.org/faqs/origin.html
- The Origin of Species by Means of Natural Selection or The Preservation of Favoured Races in the Struggle for Life An Historical Sketch Introduction Chapter I - Varition under Domestication Chapter II - Variation under Nature Chapter III - Struggle for Existence Chapter IV - Natural Selection Chapter V - Laws of Variation Chapter VI - Difficulties on Theory Chapter VII - Miscellaneous Objections ...www.zoo.uib.no/classics/origin.html