The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 26
... exhibit individuality , or the definiteness of a separate existence ; it resembles the shapeless mineral substances , each particle of which bears the character- istics of the whole . The conception of an organism as a being composed of ...
... exhibit individuality , or the definiteness of a separate existence ; it resembles the shapeless mineral substances , each particle of which bears the character- istics of the whole . The conception of an organism as a being composed of ...
Стр. 48
... exhibit an incomplete bifurcation , if not fertilized at a certain stage of maturity . This process , it is true , has been as yet demonstrated only in the ova of the frog and the domestic fowl ; but these cases are sufficient to divest ...
... exhibit an incomplete bifurcation , if not fertilized at a certain stage of maturity . This process , it is true , has been as yet demonstrated only in the ova of the frog and the domestic fowl ; but these cases are sufficient to divest ...
Стр. 73
... exhibit , for example , several important characteristics of the Batrachian skull , whereas their skin - covering recalls . the scale - armour of the Saurians . Thus we find cha- racters combined which are subsequently divided among ...
... exhibit , for example , several important characteristics of the Batrachian skull , whereas their skin - covering recalls . the scale - armour of the Saurians . Thus we find cha- racters combined which are subsequently divided among ...
Стр. 79
... exhibits a considerable number under far more heterogeneous forms . Thus in the types as in the divi- sions of the classes , the system advances from the older to the more recent periods ; while the more ancient groups gradually ...
... exhibits a considerable number under far more heterogeneous forms . Thus in the types as in the divi- sions of the classes , the system advances from the older to the more recent periods ; while the more ancient groups gradually ...
Стр. 86
... of species , bear the closest relations to one another ; they exhibit definite relations also to the surrounding element , and their AGASSIZ . 87 existence is limited within a definite period 85 THE DOCTRINE OF DESCENT .
... of species , bear the closest relations to one another ; they exhibit definite relations also to the surrounding element , and their AGASSIZ . 87 existence is limited within a definite period 85 THE DOCTRINE OF DESCENT .
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according adaptation already Ammonites Amphibians animal world apes appearance Ascidian become birds brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryonic Eocene exhibit 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 intermediate forms islands lancelet language larva larvæ likewise linguistic Linnæus 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 sponges strata structure systematic terrestrial animals Tertiary theory of selection tion transformation transition true Ungulata Ungulates varieties vegetal 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 - I had not formerly sufficiently considered the existence of many structures which appear to be, as far as we can judge, neither beneficial nor injurious ; and this I believe to be one of the greatest oversights as yet detected in my work.
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.