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 12
Página x
... SIMILAR EFFECTS OF NATURAL SELECTION AND USE - INHERITANCE INFERIORITY OF SENSES IN EUROPEANS . 83 • • 85 SHORT - SIGHT IN WATCHMAKERS AND ENGRAVERS 85 LARGER HANDS IN LABOURERS ' INFANTS THICKENED SOLE IN INFANTS 87 888 A SOURCE OF ...
... SIMILAR EFFECTS OF NATURAL SELECTION AND USE - INHERITANCE INFERIORITY OF SENSES IN EUROPEANS . 83 • • 85 SHORT - SIGHT IN WATCHMAKERS AND ENGRAVERS 85 LARGER HANDS IN LABOURERS ' INFANTS THICKENED SOLE IN INFANTS 87 888 A SOURCE OF ...
Página 14
... similar change is really occurring in man , could it not be similarly explained by some factor , such as sexual selection , which might affect the outward appearance at the cost of less obvious defects or inconveniences ? Mr. Spencer ...
... similar change is really occurring in man , could it not be similarly explained by some factor , such as sexual selection , which might affect the outward appearance at the cost of less obvious defects or inconveniences ? Mr. Spencer ...
Página 21
... of the characters thus obtained being clearly independent of use and disuse ) , natural selection must be credited with similar powers , and Mr. Wallace concludes that Mr. Spencer's insuperable difficulty is THE GIRAFFE . 21.
... of the characters thus obtained being clearly independent of use and disuse ) , natural selection must be credited with similar powers , and Mr. Wallace concludes that Mr. Spencer's insuperable difficulty is THE GIRAFFE . 21.
Página 22
... similar " class of difficulties , " which Mr. Spencer quotes from his Principles of Biology , is faulty in its reasoning , though legitimate in its conclusion concerning the increasing difficulty of evolution in proportion with the ...
... similar " class of difficulties , " which Mr. Spencer quotes from his Principles of Biology , is faulty in its reasoning , though legitimate in its conclusion concerning the increasing difficulty of evolution in proportion with the ...
Página 35
... similar manner ; but then we also know that such prompt and complete transmission of an artificial modification is widely different from the usual rule . Exceptional cases require exceptional explanations , and are scarcely good ...
... similar manner ; but then we also know that such prompt and complete transmission of an artificial modification is widely different from the usual rule . Exceptional cases require exceptional explanations , and are scarcely good ...
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.