The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for Life |
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Page xii
... 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 3
... 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 , conse- quently , there is a frequently recurrent ...
... 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 , conse- quently , there is a frequently recurrent ...
Page 6
... considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several genera- tions are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the ...
... considered as definite when all or nearly all the offspring of individuals exposed to certain conditions during several genera- tions are modified in the same manner . It is extremely difficult to come to any conclusion in regard to the ...
Page 24
... 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 ...
Page 34
... considered as varieties , but which have all been ranked by botanists as species ; and in making this list he has omitted many trifling varieties , but which nevertheless have been ranked by some botanists as species , and he has ...
... considered as varieties , but which have all been ranked by botanists as species ; and in making this list he has omitted many trifling varieties , but which nevertheless have been ranked by some botanists as species , and he has ...
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Common terms and phrases
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young