The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 51
... strata , or layers of cells . The cells of the external stratum are distinguished from those of the inner one by their elongated form , and the possession of filaments serving as organs of locomotion . All subse- quent development and ...
... strata , or layers of cells . The cells of the external stratum are distinguished from those of the inner one by their elongated form , and the possession of filaments serving as organs of locomotion . All subse- quent development and ...
Стр. 52
... strata , its primitive ventral cavity and mouth , recurs in the Coelenterata , with slight varia- tions in the Echinoderms , in some of the Annulosa , in the Sagitta , the Ascidians , and the Lancelet . From the analogy of all these ...
... strata , its primitive ventral cavity and mouth , recurs in the Coelenterata , with slight varia- tions in the Echinoderms , in some of the Annulosa , in the Sagitta , the Ascidians , and the Lancelet . From the analogy of all these ...
Стр. 61
... strata . They are the shelves in which the vegetable and animal remains lie stored . To arrange them was certainly possible only by taking the organisms which they contained as guides or clues . We , however , shall take this ...
... strata . They are the shelves in which the vegetable and animal remains lie stored . To arrange them was certainly possible only by taking the organisms which they contained as guides or clues . We , however , shall take this ...
Стр. 62
... strata will be requisite , as their mutual relations also throw light on the nature and distribution of the contemporaneous organisms . All displacements of earth which we now see occurring by means of rain , rivers , sea and other ...
... strata will be requisite , as their mutual relations also throw light on the nature and distribution of the contemporaneous organisms . All displacements of earth which we now see occurring by means of rain , rivers , sea and other ...
Стр. 63
... strata , comprised under the name of the tertiary formation , may be regarded as that during which , at least , the skeleton of the pre- sent continents finally attained its integral configuration . Within its limits fall the erection ...
... strata , comprised under the name of the tertiary formation , may be regarded as that during which , at least , the skeleton of the pre- sent continents finally attained its integral configuration . Within its limits fall the erection ...
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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.