Charles Darwin: The Origin of Species by means of Natural Selection

CHAPTER XI. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS.
7. SUMMARY OF THE PRECEDING AND PRESENT CHAPTERS. (continued)

If, then, the geological record be as imperfect as many believe, and it may at least be asserted that the record cannot be proved to be much more perfect, the main objections to the theory of natural selection are greatly diminished or disappear. On the other hand, all the chief laws of palaeontology plainly proclaim, as it seems to me, that species have been produced by ordinary generation: old forms having been supplanted by new and improved forms of life, the products of variation and the survival of the fittest.

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