The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 18
... period of its sojourn in an organism ? Thus , for instance , will the motions of a particle of oxygen be affected and altered by a neighbouring particle of hydrogen , in accordance with the same laws , when one or both form part of an ...
... period of its sojourn in an organism ? Thus , for instance , will the motions of a particle of oxygen be affected and altered by a neighbouring particle of hydrogen , in accordance with the same laws , when one or both form part of an ...
Стр. 50
... period when the type has not yet manifested self . This led him to the question , " Whether , at the beginning of development , all animals are not essen- trally ake , and whether a common primordial form oes not exist for all ? " " It ...
... period when the type has not yet manifested self . This led him to the question , " Whether , at the beginning of development , all animals are not essen- trally ake , and whether a common primordial form oes not exist for all ? " " It ...
Стр. 51
... period is nothing more than a stomach provided with an orifice ( fig . 5 0 ) ; its wall con- FIG . 5 . sists of two strata , or layers of cells . The cells of the external stratum are distinguished from those of the inner one by their ...
... period is nothing more than a stomach provided with an orifice ( fig . 5 0 ) ; its wall con- FIG . 5 . sists of two strata , or layers of cells . The cells of the external stratum are distinguished from those of the inner one by their ...
Стр. 57
... period the animal resembles the permanently sessile genera , which , by all systematic rules , and by their geological position , occupy a lower rank in the series of echino- derms . The crabs , or anourous crustacca , are raised by ...
... period the animal resembles the permanently sessile genera , which , by all systematic rules , and by their geological position , occupy a lower rank in the series of echino- derms . The crabs , or anourous crustacca , are raised by ...
Стр. 63
... period , as it seems , includes , both in Europe and America , a repeated glaci- fication of countries and vast portions of the world , of which the present state of Greenland may now give some idea . The period of the series of strata ...
... period , as it seems , includes , both in Europe and America , a repeated glaci- fication of countries and vast portions of the world , of which the present state of Greenland may now give some idea . The period of the series of strata ...
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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.