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 vi
... Species , but already stoutly questioned and firmly rejected by such followers of his as Weismann , Wallace , Poulton , Ray Lankester , and others , to say nothing of its practical rejection by so great an authority on heredity as ...
... Species , but already stoutly questioned and firmly rejected by such followers of his as Weismann , Wallace , Poulton , Ray Lankester , and others , to say nothing of its practical rejection by so great an authority on heredity as ...
Página 17
... Species , p . 110 ) . NO CONCOMITANT VARIATION FROM CONCOMITANT DISUSE . It is but fair to add that these instances of the cave - crab's eye - stalk and the closely - packed teeth are put forward by Mr. Spencer with the more C ...
... Species , p . 110 ) . NO CONCOMITANT VARIATION FROM CONCOMITANT DISUSE . It is but fair to add that these instances of the cave - crab's eye - stalk and the closely - packed teeth are put forward by Mr. Spencer with the more C ...
Página 19
... their 1 1 Origin of Species , pp . 198–9 ; Variation of Animals and Plants under Domestication , vol . ii . p . 328 footnote , also p . 206 . being able to reach otherwise inaccessible stores of foliage . C 2 THE GIRAFFE . 19.
... their 1 1 Origin of Species , pp . 198–9 ; Variation of Animals and Plants under Domestication , vol . ii . p . 328 footnote , also p . 206 . being able to reach otherwise inaccessible stores of foliage . C 2 THE GIRAFFE . 19.
Página 20
... species has ever acquired any important modification . Mr. Wallace , in his Darwinism , answers Mr. Spencer by a collection of facts showing that " variation is the rule , " that the range of varia- tion in wild animals and plants is ...
... species has ever acquired any important modification . Mr. Wallace , in his Darwinism , answers Mr. Spencer by a collection of facts showing that " variation is the rule , " that the range of varia- tion in wild animals and plants is ...
Página 22
... species - not by all . And as the difficulty 1 Mr. Spencer weakly argues that an advantageous attribute ( such as swiftness , keen sight , courage , sagacity , strength , & c . ) cannot be increased by natural selection unless it is ...
... species - not by all . And as the difficulty 1 Mr. Spencer weakly argues that an advantageous attribute ( such as swiftness , keen sight , courage , sagacity , strength , & c . ) cannot be increased by natural selection unless it is ...
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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.