The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page x
... considered . The statement with respect to young cuckoos ejecting their foster - brothers confirmed . On the cuckoo - like habits of the Molothrus . On fertile hybrid moths . The discussion on the fertility of hybrids not having been ...
... considered . The statement with respect to young cuckoos ejecting their foster - brothers confirmed . On the cuckoo - like habits of the Molothrus . On fertile hybrid moths . The discussion on the fertility of hybrids not having been ...
Page 5
... considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring ...
... considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring ...
Page 8
... considered as defi- nite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the ...
... considered as defi- nite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the ...
Page 9
... of structure , whether extremely slight or strongly marked , which appear amongst many individuals living together , may be considered as the indefinite effects of the conditions of life on CHAP . I. ] VARIATION UNDER DOMESTICATION .
... of structure , whether extremely slight or strongly marked , which appear amongst many individuals living together , may be considered as the indefinite effects of the conditions of life on CHAP . I. ] VARIATION UNDER DOMESTICATION .
Page 41
... considered as unconscious , in so far that the breeders could never have expected , or even wished , to produce the result which ensued - namely , the production of two distinct strains . The two flocks of Leicester sheep kept by Mr ...
... considered as unconscious , in so far that the breeders could never have expected , or even wished , to produce the result which ensued - namely , the production of two distinct strains . The two flocks of Leicester sheep kept by Mr ...
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Common terms and phrases
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellę larvę less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young