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
... DIMINUTION OF THE JAWS 6 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 ...
... DIMINUTION OF THE JAWS 6 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 ...
Página 5
... To perfect his work by the correction of really extraneous errors is as much a sacred duty as to study and apply the great truths he has taught . SPENCER'S EXAMPLES AND ARGUMENTS . DIMINUTION OF THE JAWS IN IMPORTANCE OF THE INQUIRY . 5.
... To perfect his work by the correction of really extraneous errors is as much a sacred duty as to study and apply the great truths he has taught . SPENCER'S EXAMPLES AND ARGUMENTS . DIMINUTION OF THE JAWS IN IMPORTANCE OF THE INQUIRY . 5.
Página 6
... DIMINUTION OF THE JAWS IN CIVILIZED RACES . MR . SPENCER verified this by comparing English jaws with Australian and Negro jaws at the College of Surgeons . He maintains that the diminution of the jaw in civilized races can only have ...
... DIMINUTION OF THE JAWS IN CIVILIZED RACES . MR . SPENCER verified this by comparing English jaws with Australian and Negro jaws at the College of Surgeons . He maintains that the diminution of the jaw in civilized races can only have ...
Página 7
... diminution in the weight and thickness of the walls of the cranium cannot well be ascribed to disuse , it must be attributed to some other cause ; and this cause may have affected the jaw also . Cessation of the process by which natural ...
... diminution in the weight and thickness of the walls of the cranium cannot well be ascribed to disuse , it must be attributed to some other cause ; and this cause may have affected the jaw also . Cessation of the process by which natural ...
Página 9
... diminution seen in female jaws . There is apparently no room for accumulated inherited effects of ancestral disuse . The number of jaws is small , indeed ; but weigh- ing them is at least more decisive than Mr. Spencer's mere inspection ...
... diminution seen in female jaws . There is apparently no room for accumulated inherited effects of ancestral disuse . The number of jaws is small , indeed ; but weigh- ing them is at least more decisive than Mr. Spencer's mere inspection ...
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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.