“But in one particular sense the more recent forms must, on my theory, be higher than the more ancient.”
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“Agassiz insists that ancient animals resemble to a certain extent the embryos of recent animals of the same classes; or that the geological succession of extinct forms is in some degree parallel to the embryological development of recent forms. . . . This doctrine of Agassiz accords well with the theory of natural selection” (p. 338).
“The theory of natural selection” became “our theory” in 1869. The opinion of Agassiz accords excellently with the theory of descent with modification, but it is not easy to see how it bears upon the fact that lucky races are preserved in the struggle for life—which, according to Mr. Darwin’s title-page, is what is meant by natural selection.
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“On the theory of descent with modification, the great law of the long-enduring but not immutable succession of the same types within the same areas, is at once explained” (p. 340).
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“It must not be forgotten that, on my theory, all the species of the same genus have descended from some one species” (p. 341).
“My theory” became “our theory” in 1869.
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