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From records here unearthed, the racial evolution of many mammals has in the past few years been made out in greater or less detail. A lemuroid form of mammal, believed to be of the type from which man has descended, has also been found in these beds.
A similarly increasing ratio should be granted for the successive developments of the difference between the Lemuroid and the higher forms of primates; for those between the original primate and other root-forms of placental mammals; for those between primary placental and implacental mammals, and perhaps also for the divergence of the most ancient stock of these and of the monotremes, for in all these cases modifications of structure appear to increase in complexity in at least that ratio.
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