Are the Effects of Use and Disuse Inherited?: An Examination of the View Held by Spencer and DarwinMacmillan, 1890 - 156 páginas |
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Página viii
... means of preventing the moral and physical degeneracy which , like an in- ternal dry rot , has hitherto been the besetting danger of all civilizations , I desire that the thinkers who mould the opinions of mankind shall not be led ...
... means of preventing the moral and physical degeneracy which , like an in- ternal dry rot , has hitherto been the besetting danger of all civilizations , I desire that the thinkers who mould the opinions of mankind shall not be led ...
Página 30
... means of enjoyment , and discovers unsuspected sources of interest and pleasure . The sense of harmony , modern as it seems to be , must have been a latent and indirect consequence of the development of the sense of hearing and of ...
... means of enjoyment , and discovers unsuspected sources of interest and pleasure . The sense of harmony , modern as it seems to be , must have been a latent and indirect consequence of the development of the sense of hearing and of ...
Página 41
... mean its extinc- tion or at least the extinction of those most susceptible of culture . The reproductive elements are also disturbed and modified in innumerable minor ways . Changed conditions or habits tend to produce a general ...
... mean its extinc- tion or at least the extinction of those most susceptible of culture . The reproductive elements are also disturbed and modified in innumerable minor ways . Changed conditions or habits tend to produce a general ...
Página 42
... means acted on in the same way as the individual plant . Seeing that such plants have 1 See Origin of Species , pp . 5-8 . " Changed conditions induce an almost indefinite amount of fluctuating variability , by which the whole ...
... means acted on in the same way as the individual plant . Seeing that such plants have 1 See Origin of Species , pp . 5-8 . " Changed conditions induce an almost indefinite amount of fluctuating variability , by which the whole ...
Página 44
... means follows that an Englishman must inherit his father's sunburnt complexion or smooth - shaven face . Of course atavism ultimately adopts many instances of revolt against its sway . But to assume that these changes of type follow the ...
... means follows that an Englishman must inherit his father's sunburnt complexion or smooth - shaven face . Of course atavism ultimately adopts many instances of revolt against its sway . But to assume that these changes of type follow the ...
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Términos y frases comunes
acquired characters acquired modifications alleged Animals and Plants appears artificial selection atavism attributed Aylesbury duck become birds bones breeds cause cent civilization concomitant variation Contemporary Review Crown 8vo cumulative Darwin Descent deterioration diminished diminution diseases domestic animals domestic rabbit duck effects of ancestral effects of disuse enlarged epilepsy evidence evil explanation eyes fact factor of evolution fancy pigeons father favoured Francis Darwin Francis Galton Galton gemmules guinea-pigs heredity Illustrations improvement incisors increased individual inherited effects inherited injuries inherited mutilations insects instances instincts jaws Lamarckian leg-bones legs lengthened muscles natural or artificial natural selection nervous neuter offspring organs Origin of Species pangenesis panmixia parents pigeons Plants under Domestication quasi-inheritance race Ray Lankester reduced wings relative reproductive elements sexual selection shortened Spencer spite of disuse spontaneous variations sternum structure suppose tameness teeth tend tendency theory thickened sole tion toes transmit true inheritance use-inheritance Variation of Animals weight Weismann wing-bones
Pasajes populares
Página 26 - For peculiar habits confined to the workers or sterile females, however long they might be followed, could not possibly affect the males and fertile females, which alone leave descendants. I am surprised that no one has hitherto advanced this demonstrative case of neuter insects, against the well-known doctrine of inherited habit, as advanced by Lamarck.