On the slow and successive appearance of new species. On their different rates of change. Species once lost do not reappear. Groups of species follow the same general rules in their appearance and disappearance as do single species. On Extinction. On simultaneous changes in the forms of life throughout the world. On the affinities of extinct species to each other and to living species. On the state of development of ancient forms. On the succession of the same types within the same areas. Summary of preceding and present chapters.
Let us now see whether the several facts and rules relating to the geological succession of organic beings, better accord with the common view of the immutability of species, or with that of their slow and gradual modification, through descent and natural selection.
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