The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432페이지 |
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7 페이지
... instance , a bulb of Hippeastrum aulicum produced four flowers ; three were fertilised by Herbert with their own pollen , and the fourth was subsequently fertilised by the pollen of a compound hybrid descended from three distinct ...
... instance , a bulb of Hippeastrum aulicum produced four flowers ; three were fertilised by Herbert with their own pollen , and the fourth was subsequently fertilised by the pollen of a compound hybrid descended from three distinct ...
8 페이지
... instance , informs me that he raises stocks for grafting from a hybrid between Rhod . ponticum and catawbiense , and that this hybrid " seeds as freely as it is possible to imagine . " Had hybrids when fairly treated , always gone on ...
... instance , informs me that he raises stocks for grafting from a hybrid between Rhod . ponticum and catawbiense , and that this hybrid " seeds as freely as it is possible to imagine . " Had hybrids when fairly treated , always gone on ...
9 페이지
Charles Darwin. confinement , few experiments have been fairly tried : for instance , the canary - bird has been crossed with ... instance they have bred inter se . This was effected by Mr. Eyton , who 27 CHAP . IX . ] DEGREES OF STERILITY .
Charles Darwin. confinement , few experiments have been fairly tried : for instance , the canary - bird has been crossed with ... instance they have bred inter se . This was effected by Mr. Eyton , who 27 CHAP . IX . ] DEGREES OF STERILITY .
10 페이지
... instance , almost certain that our dogs are descended from several wild stocks ; yet , with perhaps the exception of certain indigenous domestic dogs of South America , all are quite fertile together ; but analogy makes me greatly doubt ...
... instance , almost certain that our dogs are descended from several wild stocks ; yet , with perhaps the exception of certain indigenous domestic dogs of South America , all are quite fertile together ; but analogy makes me greatly doubt ...
13 페이지
... instance in Dianthus , these two opposite cases occur . The fertility , both of first crosses and of hybrids , is more easily affected by unfavourable conditions , than is that of pure species . But the fertility of first crosses is ...
... instance in Dianthus , these two opposite cases occur . The fertility , both of first crosses and of hybrids , is more easily affected by unfavourable conditions , than is that of pure species . But the fertility of first crosses is ...
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admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings