The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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Página 29
... division of labour . In one animal , as in the other , life is spent in the function of self - preservation and the maintenance of the species , or reproduction ; in both , the cycle of phenomena is limited , unbroken ; but the means of ...
... division of labour . In one animal , as in the other , life is spent in the function of self - preservation and the maintenance of the species , or reproduction ; in both , the cycle of phenomena is limited , unbroken ; but the means of ...
Página 32
... division . In this , that of the Vermes , the systematizer of the old school finds his real difficulty ; in so many ways do they deviate from each other , so great is the distance between the lower and the higher forms ; and after ...
... division . In this , that of the Vermes , the systematizer of the old school finds his real difficulty ; in so many ways do they deviate from each other , so great is the distance between the lower and the higher forms ; and after ...
Página 40
... division . Frequently , however , it does not stop at bisection ; the motion of the minute constituents , which causes the fission , proceeds in such a manner that the halves are again divided , and the quarters yet again , the whole ...
... division . Frequently , however , it does not stop at bisection ; the motion of the minute constituents , which causes the fission , proceeds in such a manner that the halves are again divided , and the quarters yet again , the whole ...
Página 41
... division of the mass pre- supposes that the organism thus reproducing itself pos- sesses no high complexity . The bisection of a beetle or a bird is inconceivable as a means of propagation . Yet Stein's valuable observations on the ...
... division of the mass pre- supposes that the organism thus reproducing itself pos- sesses no high complexity . The bisection of a beetle or a bird is inconceivable as a means of propagation . Yet Stein's valuable observations on the ...
Página 66
... division which is displayed in profound palæon- tological and petrographical diversities , the formation thus developed and composed is designated as the Dyas . The separate phases of this cycle of occur- rences , by which the ...
... division which is displayed in profound palæon- tological and petrographical diversities , the formation thus developed and composed is designated as the Dyas . The separate phases of this cycle of occur- rences , by which the ...
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according adaptation already Ammonites Amphibians animal world apes appearance Ascidian birds body bone brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryo 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 theory of selection tion transformation true Ungulata Ungulates varieties vertebral column Vertebrata vertebrate animals whole