If Man be separated by no greater structural barrier from the brutes than they are from one another-then it seems to follow that if any process of physical causation can be discovered by which the genera and families of ordinary animals have been produced, that process of causation is amply sufficient to account for the origin of Man. (Thomas Henry Huxley)

If Man be separated by no greater structural barrier from the brutes than they are from one another-then it seems to follow that if any process of physical causation can be discovered by which the genera and families of ordinary animals have been produced, that process of causation is amply sufficient to account for the origin of Man.

Thomas Henry Huxley

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account barrier causation follow genus man ordinary origin physical process structural

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