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ON THE ORIGIN OF SPECIES

began developing his theory of evolution by natural selection during the late 1830s, two decades before publishing his most famous book, On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life (1859). Darwin published when he did because Alfred Russel Wallace had recently formulated a similar theory, and Darwin understandably wanted to assert his claim to priority. Poor health prevented Darwin from making additional excursions after his storied voyages on the Beagle (1831-36), but he continued to elaborate his theory for the remainder of his life. The notion that biological species evolved over time was not an idea original to Darwinnatural philosophers had long pondered this possibility. Nevertheless, at the time that Origin was published, the predominant assumption across the western world was that the species owed their origin to divine acts of "special creation." Darwin's scientific thinking gradually led him towards agnosticism or skepticism (as distinct from positive atheism), however, and he came to believe that the species could be explained without recourse to divine intervention. Darwin attempted to shatter the doctrine of special creation by identifying a mechanism of biological evolution that he believed could explain the apparently designed qualities of the species.