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In speaking of an evolution theory, in distinction from the descent theory, we mean, as is evident from the first part of our work, that way and mode of constructing the doctrine of the descent of species which permit this descent to take place, not by the leaps of a metamorphosis of germs, but by transitions so imperceptably small that the difference of two generations which lie in the same line of descent, is never greater than those differences which always take place between parents and children of the same species transitions so gradual that only the continuation of these individual changes in a single direction produces an increase and, finally and gradually, the new species.
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