The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Том 2D. Appleton, 1897 |
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Стр. 11
... remarked , that the degree of fertility , both of first crosses and of hybrids , graduates from zero to perfect fertility . It is surprising in how [ CHAP . IX . many curious ways this gradation 27 CHAP . IX . ] 11 DEGREES OF STERILITY .
... remarked , that the degree of fertility , both of first crosses and of hybrids , graduates from zero to perfect fertility . It is surprising in how [ CHAP . IX . many curious ways this gradation 27 CHAP . IX . ] 11 DEGREES OF STERILITY .
Стр. 20
... remarked that species inhabiting distinct regions are often sterile when crossed ; now it could clearly have been cf no advantage to such separated species to have been rendered mutually sterile , and consequently this could not have ...
... remarked that species inhabiting distinct regions are often sterile when crossed ; now it could clearly have been cf no advantage to such separated species to have been rendered mutually sterile , and consequently this could not have ...
Стр. 52
... remarked , the extent and thickness of our sedimentary formations are the result and the measure of the denudation which the earth's crust has elsewhere undergone . Therefore a man should examine for himself the great piles of super ...
... remarked , the extent and thickness of our sedimentary formations are the result and the measure of the denudation which the earth's crust has elsewhere undergone . Therefore a man should examine for himself the great piles of super ...
Стр. 73
... remarked , " Every species is a link " between other allied forms . " If we take a genus having a score of species , recent and extinct , and destroy four - fifths of them , no one doubts that the remainder will stand much more distinct ...
... remarked , " Every species is a link " between other allied forms . " If we take a genus having a score of species , recent and extinct , and destroy four - fifths of them , no one doubts that the remainder will stand much more distinct ...
Стр. 85
... remarked , certainly preyed on other minute organic beings , which must have lived in great numbers . Thus the words , which I wrote in 1859 , about the existence of living beings long before the Cambrian period , and which are almost ...
... remarked , certainly preyed on other minute organic beings , which must have lived in great numbers . Thus the words , which I wrote in 1859 , about the existence of living beings long before the Cambrian period , and which are almost ...
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The Origin of Species by Means of Natural Selection: Or the Preservation of ... Charles Darwin Ограниченный просмотр - 1982 |
The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Просмотр фрагмента - 1982 |
The Origin of Species by Means of Natural Selection: Or, the Preservation of ... Charles Darwin Недоступно для просмотра - 2014 |
Часто встречающиеся слова и выражения
accumulated adapted admit affinity allied species ancient animals appear Archipelago arctic areas become beds believe birds breeds Cambrian changes characters classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammæ mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation paleozoic parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian slight South America species belonging stage stamens sterility structure successive suppose terrestrial tertiary tion variable variations varieties whilst widely different wings