The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 من الصفحات |
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الصفحة 28
... polype and the bee . The little animal , several lines in length , which in our waters usually lives adhering to a plant , is a hollow cylinder , of which the body - wall is formed of two layers of cells , a layer of muscles , and a ...
... polype and the bee . The little animal , several lines in length , which in our waters usually lives adhering to a plant , is a hollow cylinder , of which the body - wall is formed of two layers of cells , a layer of muscles , and a ...
الصفحة 29
... polype in proportion as it is more complex . The superior com- plexity and variety of the parts is anatomically evident , and similarly the higher phase of the life . The superior energy of the existence , the functional capacity and ...
... polype in proportion as it is more complex . The superior com- plexity and variety of the parts is anatomically evident , and similarly the higher phase of the life . The superior energy of the existence , the functional capacity and ...
الصفحة 30
... Polypes and Medusa , and in the closest connection with it stands . the interesting class of the Spongiada , especially in- structive as affording direct evidence of the doctrine of Descent . The organs of these animals are nearly ...
... Polypes and Medusa , and in the closest connection with it stands . the interesting class of the Spongiada , especially in- structive as affording direct evidence of the doctrine of Descent . The organs of these animals are nearly ...
الصفحة 31
... , which , by protrusion and retraction , serve as organs of locomotion . On account of the radiate structure pre- vailing among the Echinoderms , Medusa , and Polypes , Cuvier believed them to be more nearly related , and.
... , which , by protrusion and retraction , serve as organs of locomotion . On account of the radiate structure pre- vailing among the Echinoderms , Medusa , and Polypes , Cuvier believed them to be more nearly related , and.
الصفحة 34
... polype and the bee , and were obliged to assign to each a very different rank , a portion of this difference of grade is certainly due to the difference of the family ; but the forms united by family characteristics likewise diverge ...
... polype and the bee , and were obliged to assign to each a very different rank , a portion of this difference of grade is certainly due to the difference of the family ; but the forms united by family characteristics likewise diverge ...
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عبارات ومصطلحات مألوفة
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
مقاطع مشهورة
الصفحة 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...
الصفحة 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.
الصفحة 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.