The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página xv
... become the most pre- valent , if not the only race , in the particular country in which it had originated . " He then extends these same views to the white inhabitants of colder climates . I am indebted to Mr. Rowley , of the United ...
... become the most pre- valent , if not the only race , in the particular country in which it had originated . " He then extends these same views to the white inhabitants of colder climates . I am indebted to Mr. Rowley , of the United ...
Página xvi
... become improved in the course of modification . This same view was given in his 55th Lecture , published in the ' Lancet ' in 1834 . In 1831 Mr. Patrick Matthew published his work on ' Naval Timber and Arboriculture , ' in which he ...
... become improved in the course of modification . This same view was given in his 55th Lecture , published in the ' Lancet ' in 1834 . In 1831 Mr. Patrick Matthew published his work on ' Naval Timber and Arboriculture , ' in which he ...
Página xvii
... become adapted to its peculiar habits of life . The work , from its powerful and brilliant style , though displaying ... becoming of living things . " Farther on ( p . xc . ) , after referring to geographical dis- tribution , he adds ...
... become adapted to its peculiar habits of life . The work , from its powerful and brilliant style , though displaying ... becoming of living things . " Farther on ( p . xc . ) , after referring to geographical dis- tribution , he adds ...
Página 17
... become wild or feral , though the dovecot - pigeon , which is the rock- pigeon in a very slightly altered state , has become feral in several places . Again , all recent experience shows that it is difficult to get wild animals to breed ...
... become wild or feral , though the dovecot - pigeon , which is the rock- pigeon in a very slightly altered state , has become feral in several places . Again , all recent experience shows that it is difficult to get wild animals to breed ...
Página 18
... become less and less , as in each succeeding generation there will be less of the foreign blood ; but when there has been no cross , and there is a tendency in the breed to revert to a character which was lost during some former ...
... become less and less , as in each succeeding generation there will be less of the foreign blood ; but when there has been no cross , and there is a tendency in the breed to revert to a character which was lost during some former ...
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Términos y frases comunes
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