The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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Página 7
... latter is shrouded in a veil which never can be raised , as is even now so frequently asserted , then , indeed , all research directed towards the comprehension of life would be utterly vain and hopeless . But if the possibility of ...
... latter is shrouded in a veil which never can be raised , as is even now so frequently asserted , then , indeed , all research directed towards the comprehension of life would be utterly vain and hopeless . But if the possibility of ...
Página 9
... me- tatarsus , the latter of which affords attachment to the C FIG . I. m n b toes , we find only the long bone c , and at its lower extremity a small bone supporting the four toes . Earlier COMPARATIVE ANATOMY AND EVOLUTION . 9.
... me- tatarsus , the latter of which affords attachment to the C FIG . I. m n b toes , we find only the long bone c , and at its lower extremity a small bone supporting the four toes . Earlier COMPARATIVE ANATOMY AND EVOLUTION . 9.
Página 35
... latter merge , as might be imagined , into the reptiles . The birds , on their side , offer a sharp contrast to the mammals , and this separa- tion and divergence extend to all the subdivisions . We must figuratively represent family ...
... latter merge , as might be imagined , into the reptiles . The birds , on their side , offer a sharp contrast to the mammals , and this separa- tion and divergence extend to all the subdivisions . We must figuratively represent family ...
Página 41
... latter , meanwhile , preserving its individuality wholly or for the greater part , and yet being able to transfer to the progeny its own characteristics in their full integrity . The simplest case of gemmation is where the parent animal ...
... latter , meanwhile , preserving its individuality wholly or for the greater part , and yet being able to transfer to the progeny its own characteristics in their full integrity . The simplest case of gemmation is where the parent animal ...
Página 66
... latter ( that is to say , with the productive carboniferous strata ) , were seized with an opposite movement , and therefore sank , there would be deposited on the surface now again gradually becoming the bed of the sea , precisely ...
... latter ( that is to say , with the productive carboniferous strata ) , were seized with an opposite movement , and therefore sank , there would be deposited on the surface now again gradually becoming the bed of the sea , precisely ...
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Palavras e frases frequentes
according adaptation already Ammonites Amphibians animal world apes appearance Ascidian birds body bone brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryo Eocene exhibit existence external facts families fauna fish formation fossil Gastrula gemmules genera genus geological Goethe grade gradually groups Haeckel heredity higher horse human hypothesis idea individual infer intermediate forms investigation islands lancelet language larva larvæ likewise linguistic lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological mutability natural selection observations Oolite organisms origin ovum peculiar pedigree perfect period phase phenomena placenta plants polypes possess present primordial progenitors races regard relations remains reproduction reptiles Rütimeyer says scarcely scientific separate sexual Silurian skull species strata structure systematic terrestrial animals theory of selection tion transformation true Ungulata Ungulates varieties vertebral column Vertebrata vertebrate animals whole