Are the Effects of Use and Disuse Inherited?: An Examination of the View Held by Spencer and DarwinMacmillan, 1890 - 156 páginas |
Dentro del libro
Resultados 1-5 de 21
Página ix
... 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 .. • EFFECTS OF NATURAL ADVERSE CASE OF NEUTER INSECTS ...
... 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 .. • EFFECTS OF NATURAL ADVERSE CASE OF NEUTER INSECTS ...
Página 6
... teeth of the latter convey the contrary idea to the imagination . Mr. Spencer's assumption that the ancient Britons had large jaws appears to me erroneous . ( See Professor Rolleston's Scientific Papers and Addresses , i . p . 250 ...
... teeth of the latter convey the contrary idea to the imagination . Mr. Spencer's assumption that the ancient Britons had large jaws appears to me erroneous . ( See Professor Rolleston's Scientific Papers and Addresses , i . p . 250 ...
Página 8
... teeth when these were no longer needed as weapons of war or organs of prehension , & c . We can hardly assume that the lower half of the face is specially exempt from the influence of natural and sexual selection ; and the effects of ...
... teeth when these were no longer needed as weapons of war or organs of prehension , & c . We can hardly assume that the lower half of the face is specially exempt from the influence of natural and sexual selection ; and the effects of ...
Página 9
... teeth , and partial transference of the much more marked 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 ...
... teeth , and partial transference of the much more marked 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 ...
Página 10
... teeth and lips to a more pleasing ' and subdued position of retirement and of humanized beauty . If human preference and natural selection caused some of these differences , why are they incompetent to effect changes in the direction of ...
... teeth and lips to a more pleasing ' and subdued position of retirement and of humanized beauty . If human preference and natural selection caused some of these differences , why are they incompetent to effect changes in the direction of ...
Otras ediciones - Ver todas
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.