The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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Página 26
... exhibit individuality , or the definiteness of a separate existence ; it resembles the shapeless mineral substances , each particle of which bears the character- istics of the whole . The conception of an organism as a being composed of ...
... exhibit individuality , or the definiteness of a separate existence ; it resembles the shapeless mineral substances , each particle of which bears the character- istics of the whole . The conception of an organism as a being composed of ...
Página 48
... exhibit an incomplete bifurcation , if not fertilized at a certain stage of maturity . This process , it is true , has been as yet demonstrated only in the ova of the frog and the domestic fowl ; but these cases are sufficient to divest ...
... exhibit an incomplete bifurcation , if not fertilized at a certain stage of maturity . This process , it is true , has been as yet demonstrated only in the ova of the frog and the domestic fowl ; but these cases are sufficient to divest ...
Página 73
... exhibit , for example , several important characteristics of the Batrachian skull , whereas their skin - covering recalls the scale - armour of the Saurians . Thus we find cha- racters combined which are subsequently divided among ...
... exhibit , for example , several important characteristics of the Batrachian skull , whereas their skin - covering recalls the scale - armour of the Saurians . Thus we find cha- racters combined which are subsequently divided among ...
Página 79
... exhibits a considerable number under far more heterogeneous forms . Thus in the types as in the divi- sions of the classes , the system advances from the older to the more recent periods ; while the more ancient groups gradually ...
... exhibits a considerable number under far more heterogeneous forms . Thus in the types as in the divi- sions of the classes , the system advances from the older to the more recent periods ; while the more ancient groups gradually ...
Página 86
... , bear the closest relations to one another ; they exhibit definite relations also to the surrounding element , and their existence is limited within a definite period . Of genera 86 THE DOCTRINE OF DESCENT . 18 PALEONISCUS.
... , bear the closest relations to one another ; they exhibit definite relations also to the surrounding element , and their existence is limited within a definite period . Of genera 86 THE DOCTRINE OF DESCENT . 18 PALEONISCUS.
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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