The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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xv 페이지
... become the most prevalent , 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 prevalent , 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 ...
xvi 페이지
... become changed into permanent species , which are no longer capable of inter- crossing . Rafinesque , in his ' New Flora of North America , ' published in 1836 , wrote ( p . 6 ) as follows : - " All species might have been varieties ...
... become changed into permanent species , which are no longer capable of inter- crossing . Rafinesque , in his ' New Flora of North America , ' published in 1836 , wrote ( p . 6 ) as follows : - " All species might have been varieties ...
xvii 페이지
... 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 distri- bution , 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 distri- bution , he adds ...
18 페이지
Charles Darwin. again into their native country ; but not one has 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 ...
Charles Darwin. again into their native country ; but not one has 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 ...
19 페이지
... become less and less , as in each succeed- ing 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 succeed- ing 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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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important 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 reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young