Tabla de Contenidos: “…Pt. 1: Beginnings of a theory -- Part 2: On the origin of species: Variation under domestication ; Variation under nature ; Struggle for existence ; Natural selection; or the survival of the fittest ; Laws of variation ; Difficulties of the theory and miscellaneous objections ; Instinct ; Hybridism ; On the imperfection of the geological record ; On the geological succession of organic beings ; Geographical distribution ; Mutual affinities of organic beings : morphology : embryology : rudimentary organs ; Recapitulation and conclusion -- Pt. 3: Afterword.…”