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 11
... direct and dominant control of so uniform a cause as ancestral use and disuse . Mr. Spencer regards a variation of 1 oz . as a large one , but I found that the English jaws in the College of Surgeons varied from 19 oz . to 4'3 oz . ( or ...
... direct and dominant control of so uniform a cause as ancestral use and disuse . Mr. Spencer regards a variation of 1 oz . as a large one , but I found that the English jaws in the College of Surgeons varied from 19 oz . to 4'3 oz . ( or ...
Página 23
... direct inherit- ance of the effects of use and disuse in kind . Having a name for a thing is highly convenient ; it facilitates clearness and accuracy in reasoning , and in this particular inquiry it may save some confusion of thought ...
... direct inherit- ance of the effects of use and disuse in kind . Having a name for a thing is highly convenient ; it facilitates clearness and accuracy in reasoning , and in this particular inquiry it may save some confusion of thought ...
Página 27
... structures and the exceedingly complicated instincts of ants and bees and wasps and termites in direct defiance of the alleged tendency to use - inheritance , surely we may believe that natural selection , unop- posed by NEUTER INSECTS .
... structures and the exceedingly complicated instincts of ants and bees and wasps and termites in direct defiance of the alleged tendency to use - inheritance , surely we may believe that natural selection , unop- posed by NEUTER INSECTS .
Página 33
... this early age ? If use - inheritance was not necessary in the case of Handel , whose father was a surgeon , why is it needed to account for Bach ? D LACK OF EVIDENCE . The " direct proofs " of ESTHETIC FACULTIES . 33.
... this early age ? If use - inheritance was not necessary in the case of Handel , whose father was a surgeon , why is it needed to account for Bach ? D LACK OF EVIDENCE . The " direct proofs " of ESTHETIC FACULTIES . 33.
Página 34
... direct proofs " of use - inheritance are not as plentiful as might be desired , it appears ( pp . 24-28 ) . This acknowledged " lack of recognized evidence " is indeed the weakest feature in the case , though Mr. Spencer would fain ...
... direct proofs " of use - inheritance are not as plentiful as might be desired , it appears ( pp . 24-28 ) . This acknowledged " lack of recognized evidence " is indeed the weakest feature in the case , though Mr. Spencer would fain ...
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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.