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 ix
... DIMINISHED BITING MUSCLES OF LAP - DOGS 12 • CROWDED TEETH · 14 BLIND CAVE - CRABS 17 No CONCOMITANT VARIATION FROM CON- COMITANT DISUSE • • • 17 THE GIRAFFE , AND NECESSITY FOR CONCOMI- TANT VARIATION . ALLEGED RUINOUS SELECTION ...
... DIMINISHED BITING MUSCLES OF LAP - DOGS 12 • CROWDED TEETH · 14 BLIND CAVE - CRABS 17 No CONCOMITANT VARIATION FROM CON- COMITANT DISUSE • • • 17 THE GIRAFFE , AND NECESSITY FOR CONCOMI- TANT VARIATION . ALLEGED RUINOUS SELECTION ...
Página 7
... diminished . 1 Romanes , Galton , and Weismann have made great use of this principle in explaining the diminution of disused organs . Weis- mann has given it the name of Panmixia , —all individuals being equally free to survive and ...
... diminished . 1 Romanes , Galton , and Weismann have made great use of this principle in explaining the diminution of disused organs . Weis- mann has given it the name of Panmixia , —all individuals being equally free to survive and ...
Página 12
... DIMINISHED BITING MUSCLES OF LAP - DOGS . The next example , the reduced biting muscles , & c . , of lap - dogs is also unsatisfactory as a proof of the inheritance of the effects of disuse ; for the change can readily be accounted for ...
... DIMINISHED BITING MUSCLES OF LAP - DOGS . The next example , the reduced biting muscles , & c . , of lap - dogs is also unsatisfactory as a proof of the inheritance of the effects of disuse ; for the change can readily be accounted for ...
Página 14
... diminished by disuse ? Mr. Spencer acknowledges that the crowding of bull - dogs ' and lap - dogs ' teeth is caused by the artificial selection of shortened jaws . If a similar change is really occurring in man , could it not be ...
... diminished by disuse ? Mr. Spencer acknowledges that the crowding of bull - dogs ' and lap - dogs ' teeth is caused by the artificial selection of shortened jaws . If a similar change is really occurring in man , could it not be ...
Página 16
... diminish- ing jaw . But a note on Tasmanian skulls in the Catalogue of the College of Surgeons ( p . 199 ) shows that this lateness and irregularity have been com- mon among Tasmanians as well as among civilized races , so that the ...
... diminish- ing jaw . But a note on Tasmanian skulls in the Catalogue of the College of Surgeons ( p . 199 ) shows that this lateness and irregularity have been com- mon among Tasmanians as well as among civilized races , so that 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.