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
... least , is the feeling or motive which has prompted me to devote much time and thought to a difficult but important inquiry in a debatable region of inference and conjecture , where ( I am afraid ) evidence on either side can never be ...
... least , is the feeling or motive which has prompted me to devote much time and thought to a difficult but important inquiry in a debatable region of inference and conjecture , where ( I am afraid ) evidence on either side can never be ...
Página 9
... least more decisive than Mr. Spencer's mere inspection . The differences between Anglo - Saxon male jaws and Australian and Tasmanian jaws are most easily explained as effects of human pre- ference and natural selection . We can hardly ...
... least more decisive than Mr. Spencer's mere inspection . The differences between Anglo - Saxon male jaws and Australian and Tasmanian jaws are most easily explained as effects of human pre- ference and natural selection . We can hardly ...
Página 12
... muscles is reversed . The conscious or unconscious selection of lap - dogs with the least tendency to bite would easily bring about a general enfeeble- ment of 12 ARE THE EFFECTS OF USE INHERITED ? DIMINISHED BITING MUSCLES OF LAP-DOGS.
... muscles is reversed . The conscious or unconscious selection of lap - dogs with the least tendency to bite would easily bring about a general enfeeble- ment of 12 ARE THE EFFECTS OF USE INHERITED ? DIMINISHED BITING MUSCLES OF LAP-DOGS.
Página 15
... least are extracted- about twenty times as frequently as the closely packed lower incisors . Surely this must indicate 2 that the cause of decay is not overcrowding . 1 P. 13 ; and Nineteenth Century , February , 1888 , p . 211 . 2 ...
... least are extracted- about twenty times as frequently as the closely packed lower incisors . Surely this must indicate 2 that the cause of decay is not overcrowding . 1 P. 13 ; and Nineteenth Century , February , 1888 , p . 211 . 2 ...
Página 25
... least in all their later social complications and developments ) without the aid of use- inheritance - nay , in spite of its utmost opposition . Working bees , being infertile " neuters , " cannot as a rule transmit their own ...
... least in all their later social complications and developments ) without the aid of use- inheritance - nay , in spite of its utmost opposition . Working bees , being infertile " neuters , " cannot as a rule transmit their own ...
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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.