The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 26
... observation , these and similar beings are the simplest organisms devoid of organs . While ac- centuating the limits of research as restricted by inade- quate means of observation , we maintain the validity of Rollet's retort , that our ...
... observation , these and similar beings are the simplest organisms devoid of organs . While ac- centuating the limits of research as restricted by inade- quate means of observation , we maintain the validity of Rollet's retort , that our ...
Стр. 34
... observation , that of gra- dations within the type . When we previously compared the polype and the bee , and were obliged to assign to each a very different rank , a portion of this difference of grade is certainly due to the ...
... observation , that of gra- dations within the type . When we previously compared the polype and the bee , and were obliged to assign to each a very different rank , a portion of this difference of grade is certainly due to the ...
Стр. 41
... observations on the reproductive process of the Infusoria , make us acquainted with organisms standing far above these simple so - called Monera , of which the subdivisions undergo a series of profound metamorphoses , before separating ...
... observations on the reproductive process of the Infusoria , make us acquainted with organisms standing far above these simple so - called Monera , of which the subdivisions undergo a series of profound metamorphoses , before separating ...
Стр. 46
... observations which must . not be neglected by us , bent as we are on tracing the antecedents of the doctrine of evolution , and demon- strating the transition taking place throughout organic Nature . In the cases of alternate generation ...
... observations which must . not be neglected by us , bent as we are on tracing the antecedents of the doctrine of evolution , and demon- strating the transition taking place throughout organic Nature . In the cases of alternate generation ...
Стр. 48
... observations , had become established , that in the various stages of their development the higher animals passed through the forms of the lower ones . In this , natural philosophy did not confine itself to the limits of the types ; and ...
... observations , had become established , that in the various stages of their development the higher animals passed through the forms of the lower ones . In this , natural philosophy did not confine itself to the limits of the types ; and ...
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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.