The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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Página 17
... possible , we must think of substance or matter as consisting of particles ultimately indivisible . Of these atoms , according to the present standpoint of science , we are obliged to admit as many different species as are not ...
... possible , we must think of substance or matter as consisting of particles ultimately indivisible . Of these atoms , according to the present standpoint of science , we are obliged to admit as many different species as are not ...
Página 21
... possible to observe the molecular motions in a crystal mechanically injured in any part , it could not be unconditionally denied that the motions , hereby excited , take place absolutely without any simul- taneous excitement of ...
... possible to observe the molecular motions in a crystal mechanically injured in any part , it could not be unconditionally denied that the motions , hereby excited , take place absolutely without any simul- taneous excitement of ...
Página 29
... possible by a highly developed nervous system , and the marvellously complex sensory organs combined with it , of which the eyes are especially remarkable . Independently of the generative organs , consisting of manifold parts of ...
... possible by a highly developed nervous system , and the marvellously complex sensory organs combined with it , of which the eyes are especially remarkable . Independently of the generative organs , consisting of manifold parts of ...
Página 50
... possible for Von Baer . It is not merely a question of those general analogies in the segregation of tissues from an indiffer- ent rudimentary mass , but of homologies in the distri- bution , form , and composition of the embryos and ...
... possible for Von Baer . It is not merely a question of those general analogies in the segregation of tissues from an indiffer- ent rudimentary mass , but of homologies in the distri- bution , form , and composition of the embryos and ...
Página 61
... possible only by taking the organisms which they contained as guides or clues . We , however , shall take this arrangement as our data , and , with the object we have in view , we shall naturally consider only those strata and rocks in ...
... possible only by taking the organisms which they contained as guides or clues . We , however , shall take this arrangement as our data , and , with the object we have in view , we shall naturally consider only those strata and rocks in ...
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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