The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 49
... embryonic states of the various animal forms ; but he was obliged to go beyond the circle of the types , and he thought it probable that among all embryos of verte- brate , as well as invertebrate animals , developed from a true ovum ...
... embryonic states of the various animal forms ; but he was obliged to go beyond the circle of the types , and he thought it probable that among all embryos of verte- brate , as well as invertebrate animals , developed from a true ovum ...
Стр. 55
... embryonic resemblance , for their cranial bones are separate ; like ourselves during the first four or five days of hatching , they are without a beak ; their extremities are tolerably like each other , as are ours for about the same ...
... embryonic resemblance , for their cranial bones are separate ; like ourselves during the first four or five days of hatching , they are without a beak ; their extremities are tolerably like each other , as are ours for about the same ...
Стр. 57
... embryonic rudiment of the feather . Likewise , the tarso - meta- tarsal joint of the embryonic bird , with which we are already conversant ( p . 9 ) , and which is distinguished from the ankle - joint of mammals and of man , by its ...
... embryonic rudiment of the feather . Likewise , the tarso - meta- tarsal joint of the embryonic bird , with which we are already conversant ( p . 9 ) , and which is distinguished from the ankle - joint of mammals and of man , by its ...
Стр. 58
... embryonic fissures in the thorax correspond with the germinal branchial fissures ; the formation of the brain may be traced to the complete brain of the lampreys and the sharks , & c . In order to refute the doctrine that the embryo ...
... embryonic fissures in the thorax correspond with the germinal branchial fissures ; the formation of the brain may be traced to the complete brain of the lampreys and the sharks , & c . In order to refute the doctrine that the embryo ...
Стр. 80
... embryonic types , " or " embryonic representatives . " Thus the stalked stone - lilies are the embryonic types of the present genus Comatula ; the most ancient Echinæ are the embryonic representatives of the higher families of the ...
... embryonic types , " or " embryonic representatives . " Thus the stalked stone - lilies are the embryonic types of the present genus Comatula ; the most ancient Echinæ are the embryonic representatives of the higher families of the ...
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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.