The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 33
... side , that is , beneath the intestinal canal , nearly encircling the gullet with its anterior loop . The display of segmentation is favoured by a deposit of horny substance , which gives a skeleton - like stiffness to the integuments ...
... side , that is , beneath the intestinal canal , nearly encircling the gullet with its anterior loop . The display of segmentation is favoured by a deposit of horny substance , which gives a skeleton - like stiffness to the integuments ...
Стр. 35
... side branches ; in every branch characteristic phenomena and series are made manifest . Let us attempt it with the Vertebrata , for example . Even with the fishes we fall into great perplexity ; which to place at the end as being the ...
... side branches ; in every branch characteristic phenomena and series are made manifest . Let us attempt it with the Vertebrata , for example . Even with the fishes we fall into great perplexity ; which to place at the end as being the ...
Стр. 36
... sides . Most snails possess well - marked mantle - folds , but we can scarcely speak of the testa of many thoroughly worm - like slugs . Head and skull seem an inalienable mark of the vertebrata , yet the lancelet has no such head , but ...
... sides . Most snails possess well - marked mantle - folds , but we can scarcely speak of the testa of many thoroughly worm - like slugs . Head and skull seem an inalienable mark of the vertebrata , yet the lancelet has no such head , but ...
Стр. 53
... side of the future animal . A groove then divides it into the two germinal laminæ , and transverse striæ next make their appearance , the indications of the so - called primordial segments . The symmetrical disposition of the organs ...
... side of the future animal . A groove then divides it into the two germinal laminæ , and transverse striæ next make their appearance , the indications of the so - called primordial segments . The symmetrical disposition of the organs ...
Стр. 54
... side plates lying outside of these grow towards the ventral side , and finally merge in the navel . The position of the actual vertebral column , consisting of separate vertebræ , is always originally occupied by a cartilaginous band ...
... side plates lying outside of these grow towards the ventral side , and finally merge in the navel . The position of the actual vertebral column , consisting of separate vertebræ , is always originally occupied by a cartilaginous band ...
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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.