The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 46
... genus Distoma of the Entozoa . In the ventral cavity of one larval genera- tion arise cell - spheres , or germs , which develope into the second generation - the Cercaria . Great excitement was likewise aroused by the dis- covery of the ...
... genus Distoma of the Entozoa . In the ventral cavity of one larval genera- tion arise cell - spheres , or germs , which develope into the second generation - the Cercaria . Great excitement was likewise aroused by the dis- covery of the ...
Стр. 71
... genus of the Cephalopoda , Clymenia , subsequently replaced by the Ammonites . Above all , we must note the increased abundance of fish which still form the sole representatives of the Vertebrata , and held undisputed sway in the seas ...
... genus of the Cephalopoda , Clymenia , subsequently replaced by the Ammonites . Above all , we must note the increased abundance of fish which still form the sole representatives of the Vertebrata , and held undisputed sway in the seas ...
Стр. 80
... genus Comatula ; the most ancient Echinæ are the embryonic representatives of the higher families of the Clypeastra and Spatanga ; the Mastodon , on account of its persistent molar teeth , is the embryonic type of the elephant , which ...
... genus Comatula ; the most ancient Echinæ are the embryonic representatives of the higher families of the Clypeastra and Spatanga ; the Mastodon , on account of its persistent molar teeth , is the embryonic type of the elephant , which ...
Стр. 87
... genus as such , and to be exclusively characteristic of each genus ? We ask every systematizer whether he may not equally well apply this definition to species , varieties , & c . , and whether it is not finally the ulti- mate ...
... genus as such , and to be exclusively characteristic of each genus ? We ask every systematizer whether he may not equally well apply this definition to species , varieties , & c . , and whether it is not finally the ulti- mate ...
Стр. 88
... genus , and species , might be determined . The weak- ness of this and similar statements may best be demon- strated by examining the basis of all dogmatic system , -the " species . " If this idea be mutable , if the species be not ...
... genus , and species , might be determined . The weak- ness of this and similar statements may best be demon- strated by examining the basis of all dogmatic system , -the " species . " If this idea be mutable , if the species be not ...
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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.