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Purposes in nature.  The impartial investigator who pursues the history of the eye and the forms it has assumed among the lowest creatures, who demonstrates the whole step-by-step evolution of the eye, must arrive at the great conclusion that vision was not the intention behind the creation of the eye, but that vision appeared, rather, after chance had put the apparatus together. A single instance of this kind  and 'purposes' fall away like scales from the eyes!