The Doctrine of Descent And Darwinism
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The most ancient known remains of the Mammalia are found in the Trias. They occur somewhat more frequently in the central Mesozoic strata, and they all belong to Marsupial animals. Now as Marsupials, in comparison with the inferior classes of vertebrate ani- mals from which they must be derived, are very highly developed, and as in the Monotremata (Duck-mole, Ornithorhyncus, and Porcupine ant-eater, Echidna, ) we possess mammals which are manifestly far beneath the Marsupials, we are referred e...ntirely to conjecture and inference for the origin of the mammals. These point to amphibian-like beings, in which certain pe- culiarities of the mammalian skull, such as the double condyle of the occiput, were prefigured, and which by the formation of the amnios and allantois ap- proached the true reptiles. These progenitors of the Mammalia are not, however, represented in any order of reptiles or amphibians now extant. The pedigree (p. 269) in which we have grouped the more accurately known fossil Mammalia with those now living, contains considerable gaps, and rests in a great measure on hypothesis, but it gives, nevertheless, with approximate probability a correct representation of the consanguinity of the orders, and in comparison with the system as it was constructed in the school-books prior to the revival cf the doctrine of Descent, it must be esteemed a great and suggestive advance.
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To quickly assess the difficulty of the text, read a short excerpt:
The most ancient known remains of the Mammalia are found in the Trias. They occur somewhat more frequently in the central Mesozoic strata, and they all belong to Marsupial animals. Now as Marsupials, in comparison with the inferior classes of vertebrate ani- mals from which they must be derived, are very highly developed, and as in the Monotremata (Duck-mole, Ornithorhyncus, and Porcupine ant-eater, Echidna, ) we possess mammals which are manifestly far beneath the Marsupials, we are referred e...ntirely to conjecture and inference for the origin of the mammals. These point to amphibian-like beings, in which certain pe- culiarities of the mammalian skull, such as the double condyle of the occiput, were prefigured, and which by the formation of the amnios and allantois ap- proached the true reptiles. These progenitors of the Mammalia are not, however, represented in any order of reptiles or amphibians now extant. The pedigree (p. 269) in which we have grouped the more accurately known fossil Mammalia with those now living, contains considerable gaps, and rests in a great measure on hypothesis, but it gives, nevertheless, with approximate probability a correct representation of the consanguinity of the orders, and in comparison with the system as it was constructed in the school-books prior to the revival cf the doctrine of Descent, it must be esteemed a great and suggestive advance.
What to read after The Doctrine of Descent And Darwinism?
You can find similar books in the "Read Also" column, or choose other free books by Dr Eduard Oskar Schmidt to read onlineMoreLess
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