The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 9
... reptile or a mammal . But the leg of a bird , as a com- plete organ does not har- monize with the leg of other vertebrata until the develop- ment of the bird in the egg reveals that the disposition of the segments and of the ...
... reptile or a mammal . But the leg of a bird , as a com- plete organ does not har- monize with the leg of other vertebrata until the develop- ment of the bird in the egg reveals that the disposition of the segments and of the ...
Стр. 35
... reptiles . The birds , on their side , offer a sharp contrast to the mammals , and this separa- tion and divergence extend to all the subdivisions . We must figuratively represent family branches , clusters of genera , and tufts of ...
... reptiles . The birds , on their side , offer a sharp contrast to the mammals , and this separa- tion and divergence extend to all the subdivisions . We must figuratively represent family branches , clusters of genera , and tufts of ...
Стр. 57
... reptiles to the birds . Now , if , in the physiological reflections which Von Baer put into their beaks , the birds , as will appear later , were mistaken in boasting of their feathery garb in contrast to mammals and to man , they have ...
... reptiles to the birds . Now , if , in the physiological reflections which Von Baer put into their beaks , the birds , as will appear later , were mistaken in boasting of their feathery garb in contrast to mammals and to man , they have ...
Стр. 73
... reptile life stamps this middle period . The Trias as yet possesses no true Teleostei . The Labyrinthodonta still ... reptiles . One single discovery in the upper member of the Trias - the teeth of a predatory marsupial — has supplied ...
... reptile life stamps this middle period . The Trias as yet possesses no true Teleostei . The Labyrinthodonta still ... reptiles . One single discovery in the upper member of the Trias - the teeth of a predatory marsupial — has supplied ...
Стр. 74
... reptiles and of fish . In addition to these animals , we must distinguish among the marine fauna the Ammonites , which now appear in vast masses , and the Nautili , the second chief form of the ancient Cephalopods , the study of which ...
... reptiles and of fish . In addition to these animals , we must distinguish among the marine fauna the Ammonites , which now appear in vast masses , and the Nautili , the second chief form of the ancient Cephalopods , the study of which ...
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according adaptation already Ammonites Amphibians animal world apes appearance Ascidian become birds brain carboniferous causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryonic Eocene exhibit existence external facts families fauna fish formation fossil Ganoids Gastrula genera genus geological Goethe grade gradually groups Haeckel heredity higher horse human hypothesis idea individual infer Insectivora intermediate forms islands lancelet language larva larvæ likewise linguistic lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological mutability natural selection observation Oolite organisms origin peculiar pedigree perfect period phase phenomena placenta plants polypes possess present primordial progenitors races relations remains reproduction reptiles resemblance Rütimeyer says scarcely scientific separate sexual Silurian skull species strata structure systematic terrestrial animals Tertiary theory of selection tion transformation transition true Ungulata Ungulates varieties vertebral column Vertebrata vertebrate animals whole
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Стр. 162 - There is grandeur in this view of life, with its several powers, having been originally breathed by the Creator into a few forms or into one; and that, whilst this planet has gone cycling on according to the fixed law of gravity, from so simple a beginning endless forms most beautiful and most wonderful have been, and are being evolved.18 Darwin always knew that his views would be controversial. A few days before The Origin of Species appeared, Darwin wrote, in a letter to Wallace, 'God knows what...
Стр. 160 - Na'geli on plants, and the remarks by various authors with respect to animals, more especially those recently made by Professor Broca, that in the earlier editions of my Origin of Species I perhaps attributed too much to the action of natural selection or the survival of the fittest.