On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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Página 3
... Gärtner , who almost devoted their lives to this subject , without being deeply impressed with the high generality of some degree of sterility . Kölreuter makes the rule universal ; but then he cuts the knot , for in ten cases in which ...
... Gärtner , who almost devoted their lives to this subject , without being deeply impressed with the high generality of some degree of sterility . Kölreuter makes the rule universal ; but then he cuts the knot , for in ten cases in which ...
Página 4
... Gärtner , arrived at diametrically opposite conclusions in regard to some of the very same forms . It is also most instructive to compare - but I have not space here to enter on details the evidence advanced by our best botanists on the ...
... Gärtner , arrived at diametrically opposite conclusions in regard to some of the very same forms . It is also most instructive to compare - but I have not space here to enter on details the evidence advanced by our best botanists on the ...
Página 5
... Gärtner , namely , that if even the less fertile hybrids be artificially fertilised with hybrid pollen of the same kind , their fertility , notwithstanding the frequent ill effects from manipulation , sometimes decidedly increases , and ...
... Gärtner , namely , that if even the less fertile hybrids be artificially fertilised with hybrid pollen of the same kind , their fertility , notwithstanding the frequent ill effects from manipulation , sometimes decidedly increases , and ...
Página 6
... Gärtner that some degree of sterility between distinct species is a universal law of nature . He experimented on some of the very same species as did Gärtner . The difference in their results may , I think , be in part accounted for by ...
... Gärtner that some degree of sterility between distinct species is a universal law of nature . He experimented on some of the very same species as did Gärtner . The difference in their results may , I think , be in part accounted for by ...
Página 8
... Gärtner believed to be the case , the fact would have been notorious to nursery- Horticulturists raise large beds of the same hy- brid , and such alone are fairly treated , for by insect agency the several individuals are allowed to ...
... Gärtner believed to be the case , the fact would have been notorious to nursery- Horticulturists raise large beds of the same hy- brid , and such alone are fairly treated , for by insect agency the several individuals are allowed to ...
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Términos y frases comunes
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