The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 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 ...
Стр. 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 ...
Стр. 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 ...
Стр. 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.22 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.22 With them ...
Стр. 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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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.