Darwiniana: Essays And Reviews Pertaining to Darwinism
Darwiniana: Essays And Reviews Pertaining to Darwinism
Asa Gray
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This raises the question, Why does Darwin press his theory to these extremeconclusions? Why do all hypotheses of derivation converge so inevitably toone ultimate point? Having already considered some of the reasons whichsuggest or support the theory at its outset--which may carry it as far assuch sound and experienced naturalists as Pictet allow that it may betrue--perhaps as far as Darwin himself unfolds it in the introductoryproposition cited at the beginning of this article--we may now inqui...re afterthe motives which impel the theorist so much farther. Here proofs, in theproper sense of the word, are not to be had. We are beyond the region ofdemonstration, and have only probabilities to consider. What are theseprobabilities? What work will this hypothesis do to establish a claim to beadopted in its completeness? Why should a theory which may plausibly enoughaccount for the diversification of the species of each special type orgenus be expanded into a general system for the origination or successivediversification of all species, and all special types or forms, from fouror five remote primordial forms, or perhaps from one?
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