The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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Página 35
... varieties . With this representation of the tree - like distribution of the system , we shall gladly revert to the comparison of the members of different types , with reference to their functional value . The bee in itself is manifestly ...
... varieties . With this representation of the tree - like distribution of the system , we shall gladly revert to the comparison of the members of different types , with reference to their functional value . The bee in itself is manifestly ...
Página 87
... varieties , & c . , and whether it is not finally the ulti- mate structural peculiarities of some of their parts which produce the characteristic forms of the species , the variety , & c . In vain do we search in the " Essay on ...
... varieties , & c . , and whether it is not finally the ulti- mate structural peculiarities of some of their parts which produce the characteristic forms of the species , the variety , & c . In vain do we search in the " Essay on ...
Página 91
... varieties characterized by " less essential " peculiari- ties acquired by means of climate and inheritance . There was , however , always a reservation that their crosses with one another and with the main species should produce fertile ...
... varieties characterized by " less essential " peculiari- ties acquired by means of climate and inheritance . There was , however , always a reservation that their crosses with one another and with the main species should produce fertile ...
Página 93
... varieties , and only prove that the true " species " have not yet been found . We may now turn with advantage to the class of the Spongiada , the importance of which in the question of species I was the first to point out . " With them ...
... varieties , and only prove that the true " species " have not yet been found . We may now turn with advantage to the class of the Spongiada , the importance of which in the question of species I was the first to point out . " With them ...
Página 95
... varieties cannot be sharply sepa- rated . " Whoever after these demonstrations cleaves to the phantom of species , without either proving that the facts have been falsely observed , or that they may be interpreted otherwise than in ...
... varieties cannot be sharply sepa- rated . " Whoever after these demonstrations cleaves to the phantom of species , without either proving that the facts have been falsely observed , or that they may be interpreted otherwise than 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