The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 من الصفحات |
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الصفحة
... LANCELET 251 23. LARVA OF ASCIDIAN • • 253 24. FULL - GROWN ASCIDIAN . • • 255 25. IMPRESSION OF TAIL OF ARCHÆOPTERYX 266 • • 26. SKELETONS OF FEET : ANCHITHERIUM , HIPPARION , HORSE 274 THE DOCTRINE OF DESCENT AND DARWINISM . I ...
... LANCELET 251 23. LARVA OF ASCIDIAN • • 253 24. FULL - GROWN ASCIDIAN . • • 255 25. IMPRESSION OF TAIL OF ARCHÆOPTERYX 266 • • 26. SKELETONS OF FEET : ANCHITHERIUM , HIPPARION , HORSE 274 THE DOCTRINE OF DESCENT AND DARWINISM . I ...
الصفحة 35
... The bee in itself is manifestly a far more complex organism than the lowest fish - like animal , the lancelet ; and in these two we compare a low form of a high type , and a high form \ of a low type . By varying and combining comparisons.
... The bee in itself is manifestly a far more complex organism than the lowest fish - like animal , the lancelet ; and in these two we compare a low form of a high type , and a high form \ of a low type . By varying and combining comparisons.
الصفحة 36
... 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- ratus , and 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- ratus , and the ...
الصفحة 52
... Lancelet . From the analogy of all these animals , and especially of the last , we shall be able hereafter to derive important inductions . But if no weight be attached to the presence of these filaments of the external layer , which is ...
... Lancelet . From the analogy of all these animals , and especially of the last , we shall be able hereafter to derive important inductions . But if no weight be attached to the presence of these filaments of the external layer , which is ...
الصفحة 150
... lancelet is completely eyeless , and therefore affords no clue . In other orders of animals , however , we still see in the systematic series of the present era every possible gra- dation , and thus possess a representation of the ...
... lancelet is completely eyeless , and therefore affords no clue . In other orders of animals , however , we still see in the systematic series of the present era every possible gra- dation , and thus possess a representation of the ...
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عبارات ومصطلحات مألوفة
according adaptation already Ammonites Amphibians animal world apes appearance Ascidian become birds body brain 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 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 Tertiary theory of selection tion transformation transition true Ungulata varieties 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.