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 13
Página 14
... of modern teeth as a sign or result of their being overcrowded 1 References of course are to Factors of Organic Evolution . through the diminution of the jaw by disuse.1 But the 14 ARE THE EFFECTS OF USE INHERITED ? CROWDED TEETH.
... of modern teeth as a sign or result of their being overcrowded 1 References of course are to Factors of Organic Evolution . through the diminution of the jaw by disuse.1 But the 14 ARE THE EFFECTS OF USE INHERITED ? CROWDED TEETH.
Página 22
... course the more complicated the evolution the slower it will be ; but time is plentiful , and the amount of elimination is correspondingly vast . increases we find neglect and decay of the less- needed 22 ARE THE EFFECTS OF USE INHERITED ?
... course the more complicated the evolution the slower it will be ; but time is plentiful , and the amount of elimination is correspondingly vast . increases we find neglect and decay of the less- needed 22 ARE THE EFFECTS OF USE INHERITED ?
Página 39
... 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 led NERVOUS DISORDERS . 39.
... 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 led NERVOUS DISORDERS . 39.
Página 44
... course atavism ultimately adopts many 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 ...
... course atavism ultimately adopts many 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 ...
Página 66
... course a considerable diminution . Part of this reduction must be due to the direct effect of disuse during the lifetime of the indi- vidual . Another and perhaps very consider- able part of the relative change must be attri- buted to ...
... course a considerable diminution . Part of this reduction must be due to the direct effect of disuse during the lifetime of the indi- vidual . Another and perhaps very consider- able part of the relative change must be attri- buted to ...
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.