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 17
... instances of the cave - crab's eye - stalk and the closely - packed teeth are put forward by Mr. Spencer with the more C << immediate object of proving that there is no concomitant VARIATION NOT CONCOMITANT . 17 BLIND CAVE-CRABS No ...
... instances of the cave - crab's eye - stalk and the closely - packed teeth are put forward by Mr. Spencer with the more C << immediate object of proving that there is no concomitant VARIATION NOT CONCOMITANT . 17 BLIND CAVE-CRABS No ...
Página 19
... instance , that natural selection is inadequate to effect the numerous concomitant changes necessitated by such developments as that of the long neck of the giraffe . Darwin , however , on the contrary , holds that natural selection ...
... instance , that natural selection is inadequate to effect the numerous concomitant changes necessitated by such developments as that of the long neck of the giraffe . Darwin , however , on the contrary , holds that natural selection ...
Página 39
... instance of simultaneous action , " and not of true inheritance . " The alcohol pervades his tissues , and , of course , affects the germinal matter in the sexual elements as much as it does that in his own structural cells , which have ...
... instance of simultaneous action , " and not of true inheritance . " The alcohol pervades his tissues , and , of course , affects the germinal matter in the sexual elements as much as it does that in his own structural cells , which have ...
Página 44
... instances of revolt against its sway . But to assume that these changes of type follow the personal change rather than cause it , is to assume the whole question at issue . That like begets like is true as a broad principle , but it has ...
... instances of revolt against its sway . But to assume that these changes of type follow the personal change rather than cause it , is to assume the whole question at issue . That like begets like is true as a broad principle , but it has ...
Página 60
... instance , and in this instance only , has Darwin given the weights of the skeletons , thus furnishing the means for a closer examination of his details than is usually possible . If we ignore such factors as selection , pan- mixia ...
... instance , and in this instance only , has Darwin given the weights of the skeletons , thus furnishing the means for a closer examination of his details than is usually possible . If we ignore such factors as selection , pan- mixia ...
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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.