The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 11
... phases of the development of the individual . There are here vast chasms yet to be filled up by future observa- tion , though in many points we must not altogether despair of success . But that the process of palæon- tological ...
... phases of the development of the individual . There are here vast chasms yet to be filled up by future observa- tion , though in many points we must not altogether despair of success . But that the process of palæon- tological ...
Стр. 29
... phase of the life . The superior energy of the existence , the functional capacity and per- fection of the bee as contrasted with the feebleness of the polype , is obviously a result , or more correctly an expression , of the greater ...
... phase of the life . The superior energy of the existence , the functional capacity and per- fection of the bee as contrasted with the feebleness of the polype , is obviously a result , or more correctly an expression , of the greater ...
Стр. 51
... phase . The diagram gives the section of a larva of this description , which at this period is nothing more than a stomach provided with an orifice ( fig . 5 0 ) ; its wall con- 0 D 22 / 0 / o / b / o / doc / dopp 000000 FIG . 5 . sists ...
... phase . The diagram gives the section of a larva of this description , which at this period is nothing more than a stomach provided with an orifice ( fig . 5 0 ) ; its wall con- 0 D 22 / 0 / o / b / o / doc / dopp 000000 FIG . 5 . sists ...
Стр. 52
... phase of the ciliated larva , with its twofold strata , its primitive ventral cavity and mouth , recurs in the Cœlenterata , with slight varia- tions in the Echinoderms , in some of the Annulosa , in the Sagitta , the Ascidians , and ...
... phase of the ciliated larva , with its twofold strata , its primitive ventral cavity and mouth , recurs in the Cœlenterata , with slight varia- tions in the Echinoderms , in some of the Annulosa , in the Sagitta , the Ascidians , and ...
Стр. 53
... phase portrayed in the diagram ( fig . 6 ) . It represents the embryo of the great black - beetle ( Hydro- philus piceus ) on its ventral side . The antennæ ( ƒ ) , the three pair of oral appendages ( m ) , and the three pair of legs ...
... phase portrayed in the diagram ( fig . 6 ) . It represents the embryo of the great black - beetle ( Hydro- philus piceus ) on its ventral side . The antennæ ( ƒ ) , the three pair of oral appendages ( m ) , and the three pair of legs ...
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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
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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 - 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.
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.