The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 من الصفحات |
من داخل الكتاب
النتائج 1-5 من 11
الصفحة 33
... vertebral column , that portion of the internal and persistently bony or cartilaginous skeleton , in which the main portion of the nervous system is contained . It is thus established that the systematic classification of the animal ...
... vertebral column , that portion of the internal and persistently bony or cartilaginous skeleton , in which the main portion of the nervous system is contained . It is thus established that the systematic classification of the animal ...
الصفحة 36
... vertebral column ; yet this , the special badge of nobility of the vertebrate animals , like the auditory appa- ratus , and the notochord , is , even if only transiently , a possession of the Ascidians , a class of animals which in ...
... vertebral column ; yet this , the special badge of nobility of the vertebrate animals , like the auditory appa- ratus , and the notochord , is , even if only transiently , a possession of the Ascidians , a class of animals which in ...
الصفحة 54
... spinal cord , as it is gradually enveloped in a sheath growing from below , is followed by the formation of ... vertebral column , consisting of separate vertebræ , is always originally occupied by a cartilaginous band , the ...
... spinal cord , as it is gradually enveloped in a sheath growing from below , is followed by the formation of ... vertebral column , consisting of separate vertebræ , is always originally occupied by a cartilaginous band , the ...
الصفحة 72
... vertebral column , as in the sharks , enters the upper flap of the tail and renders it strikingly unsymmetrical . The Ganoids are , as comparative anatomy has proved with certainty , a development of the shark - like fishes , if not ...
... vertebral column , as in the sharks , enters the upper flap of the tail and renders it strikingly unsymmetrical . The Ganoids are , as comparative anatomy has proved with certainty , a development of the shark - like fishes , if not ...
الصفحة 110
... vertebra . He followed it in its transformations along the vertebral column . Impossible as it may be , by placing together the first vertebra of the neck with . the last tail bone to infer their identity , it becomes manifest in the ...
... vertebra . He followed it in its transformations along the vertebral column . Impossible as it may be , by placing together the first vertebra of the neck with . the last tail bone to infer their identity , it becomes manifest in the ...
طبعات أخرى - عرض جميع المقتطفات
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.