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In the place of a mere assertion of our ignorance as to the way these phenomena have been produced, he brings forward, as their explanation, a cause which it is contended in this work is demonstrably insufficient. Chances against concordant variations. Examples of discordant ones. Concordant variations not unlikely on a non-Darwinian evolutionary hypothesis. Placental and implacental mammals.
Again, we have considered, in the third chapter, the great improbability that from minute variations in all directions alone and unaided, save by the survival of the fittest, closely similar structures should independently arise; though, on a non-Darwinian evolutionary hypothesis, their development might be expected a priori.
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