Contributions to the Theory of Natural Selection: A Series of Essays
CreateSpace Independent Publishing Platform, 13. jaan 2015 - 220 pages
"[...]species existing which had lived at the commencement of the period. This complete renewal of the forms of life also appears to have occurred several times: -That from the last of the geological epochs to the present or historical epoch, the change of organic life has been gradual: the first appearance of animals now existing can in many cases be traced, their numbers gradually increasing in the more recent formations, while other species continually die out and disappear, so that the present condition of the organic world is clearly derived by a natural process of gradual extinction and creation of species from that of the latest[...]."
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