The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 19
... shown to be the effects of forces , which at other times also are inherent in the atoms . But similarly I should regard the vitalistic view as proved , if in any case a particular motion actually observed to take place in an organism ...
... shown to be the effects of forces , which at other times also are inherent in the atoms . But similarly I should regard the vitalistic view as proved , if in any case a particular motion actually observed to take place in an organism ...
Стр. 33
... shown in the integuments of the Mollusca , our mussels , snails , and cuttle - fish . For although so many are supplied with protecting scales and shells , these are mere excretions from the actual skin , which remains soft , and ...
... shown in the integuments of the Mollusca , our mussels , snails , and cuttle - fish . For although so many are supplied with protecting scales and shells , these are mere excretions from the actual skin , which remains soft , and ...
Стр. 42
... shown in Madrepores and Fungiform corals . This brings us to the highly - important phenomenon of Alternate Generation , which we must elucidate by a few examples before entering upon the nature of sexual reproduction . Figure 3 shows ...
... shown in Madrepores and Fungiform corals . This brings us to the highly - important phenomenon of Alternate Generation , which we must elucidate by a few examples before entering upon the nature of sexual reproduction . Figure 3 shows ...
Стр. 47
... shown that these germs proceed from the situation of the sexual glands ( which in many insects are deve- loped at a very early stage ) , and must therefore be regarded as unfertilized ova . The second generation of maggots lives at the ...
... shown that these germs proceed from the situation of the sexual glands ( which in many insects are deve- loped at a very early stage ) , and must therefore be regarded as unfertilized ova . The second generation of maggots lives at the ...
Стр. 57
... shown in the larva ( Fig . 8 ) . It is by the abor- tion of the tail , which is employed by the long - tailed species as a natatory organ , that they become more fitted for running , and some of them for terrestrial life , as they are ...
... shown in the larva ( Fig . 8 ) . It is by the abor- tion of the tail , which is employed by the long - tailed species as a natatory organ , that they become more fitted for running , and some of them for terrestrial life , as they are ...
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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.