The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 من الصفحات |
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الصفحة 9
... vertebrata until the develop- ment of the bird in the egg reveals that the disposition of the segments and of the articulations is precisely the same in both cases , and that the apparent anomaly is produced merely by the subsequent ...
... vertebrata until the develop- ment of the bird in the egg reveals that the disposition of the segments and of the articulations is precisely the same in both cases , and that the apparent anomaly is produced merely by the subsequent ...
الصفحة 10
... same group of animals , -how , for instance , the mammal passes through stages at which the lower vertebrata remain fixed , -a connection , at first sight POSITION OF PALEONTOLOGY . I I mysterious , is indicated ΙΟ THE DOCTRINE OF DESCENT .
... same group of animals , -how , for instance , the mammal passes through stages at which the lower vertebrata remain fixed , -a connection , at first sight POSITION OF PALEONTOLOGY . I I mysterious , is indicated ΙΟ THE DOCTRINE OF DESCENT .
الصفحة 33
... Vertebrata , the family with which man is insepa- rably united . The essential part is the vertebral column , that portion of the internal and persistently bony or cartilaginous skeleton , in which the main portion of the nervous system ...
... Vertebrata , the family with which man is insepa- rably united . The essential part is the vertebral column , that portion of the internal and persistently bony or cartilaginous skeleton , in which the main portion of the nervous system ...
الصفحة 35
... Vertebrata , for example . Even with the fishes we fall into great perplexity ; which to place at the end as being the highest . But take which we will , the sharks or our teleostei , the am- phibians cannot be annexed in a direct line ...
... Vertebrata , for example . Even with the fishes we fall into great perplexity ; which to place at the end as being the highest . But take which we will , the sharks or our teleostei , the am- phibians cannot be annexed in a direct line ...
الصفحة 36
... vertebrata , yet the lancelet has no such head , but merely an anterior end . Nevertheless , it may be objected , it has a vertebral column ; yet this , the special badge of nobility of the vertebrate animals , like the auditory appa ...
... vertebrata , yet the lancelet has no such head , but merely an anterior end . Nevertheless , it may be objected , it has a vertebral column ; yet this , the special badge of nobility of the vertebrate animals , like the auditory appa ...
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عبارات ومصطلحات مألوفة
according adaptation already Ammonites Amphibians animal world apes appearance Ascidian become birds brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryonic Eocene exhibit 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 intermediate forms islands lancelet language larva larvæ likewise linguistic Linnæus 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 sponges strata structure systematic terrestrial animals Tertiary theory of selection tion transformation transition true Ungulata Ungulates varieties vegetal vertebral column Vertebrata vertebrate animals whole
مقاطع مشهورة
الصفحة 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...
الصفحة 160 - I had not formerly sufficiently considered the existence of many structures which appear to be, as far as we can judge, neither beneficial nor injurious ; and this I believe to be one of the greatest oversights as yet detected in my work.
الصفحة 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.