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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vi 페이지
... period -Alternate Glacial periods in the North and South • 129 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the inhabitants of oceanic islands — Absence of Batrachians and of ...
... period -Alternate Glacial periods in the North and South • 129 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh - water productions - On the inhabitants of oceanic islands — Absence of Batrachians and of ...
23 페이지
... period . This latter alternative has not been sufficiently attended to ; but I believe , from observations communi- cated to me by Mr. Hewitt , who has had great experience in hybridising pheasants and fowls , that the early death . of ...
... period . This latter alternative has not been sufficiently attended to ; but I believe , from observations communi- cated to me by Mr. Hewitt , who has had great experience in hybridising pheasants and fowls , that the early death . of ...
50 페이지
... one form had re- mained for a very long period unaltered , whilst its de- scendants had undergone a vast amount of change ; and the principle of competition between organism and organism , 50 [ CHAP . X. IMPERFECTION OF THE.
... one form had re- mained for a very long period unaltered , whilst its de- scendants had undergone a vast amount of change ; and the principle of competition between organism and organism , 50 [ CHAP . X. IMPERFECTION OF THE.
57 페이지
... according to the standard of years , how long a period it takes to modify a species ; but to the subject of time we must return . On the Poorness of Palæontological Collections . Now let us 30 CHAP . X. ] 57 THE LAPSE OF TIME .
... according to the standard of years , how long a period it takes to modify a species ; but to the subject of time we must return . On the Poorness of Palæontological Collections . Now let us 30 CHAP . X. ] 57 THE LAPSE OF TIME .
59 페이지
... period . Lastly , many great deposits requiring a vast length of time for their accumulation , are entirely ... periods , it is superfluous to state that our evidence is fragmentary in an extreme degree . For instance , until recently ...
... period . Lastly , many great deposits requiring a vast length of time for their accumulation , are entirely ... periods , it is superfluous to state that our evidence is fragmentary in an extreme degree . For instance , until recently ...
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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