The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 240
... Gärtner , also , makes the rule equally universal ; and he disputes the entire fer- tility of Kölreuter's ten cases . But in these and in many other cases , Gärtner is obliged carefully to count the seeds , in order to show that there ...
... Gärtner , also , makes the rule equally universal ; and he disputes the entire fer- tility of Kölreuter's ten cases . But in these and in many other cases , Gärtner is obliged carefully to count the seeds , in order to show that there ...
Стр. 242
... Gärtner , namely , that if even the less fertile hybrids be artificially fertilized with hybrid pollen of the same kind , their fertility , not- withstanding the frequent ill effects from manipulation , some- times decidedly increases ...
... Gärtner , namely , that if even the less fertile hybrids be artificially fertilized with hybrid pollen of the same kind , their fertility , not- withstanding the frequent ill effects from manipulation , some- times decidedly increases ...
Стр. 265
... Gärtner states that mongrels are more liable than hybrids to re- vert to either parent form ; but this , if it be true , is certainly only a difference in degree . Moreover , Gärtner expressly states that the hybrids from long ...
... Gärtner states that mongrels are more liable than hybrids to re- vert to either parent form ; but this , if it be true , is certainly only a difference in degree . Moreover , Gärtner expressly states that the hybrids from long ...
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Часто встречающиеся слова и выражения
adapted admit affinity ancient animals appear Archipelago areas become believe belonging birds Cambrian characters classification climate closely allied species common continent creation crustaceans degree deposits descent with modification developed difficulty distant distinct species domestic doubt embryo Europe existing extinct facts faunas 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 INDIANENSIS individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammæ mammals manner marine Marsupials MDCCCXX migration modified descendants mongrels mountains natural selection naturalists nearly oceanic islands offspring parent peculiar perfect pistil plants pollen present probably produced progenitor quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds SIGILLUM Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory of natural tion variations varieties VERITAS whole widely different