Darwinism: An Exposition of the Theory of Natural Selection, with Some of Its ApplicationsMacmillan, 1912 - 494 pages |
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Page xv
... hybrids and of the infertility of mongrels -The effects of close interbreeding - Mr . Huth's objections - Fertile hybrids among animals - Fertility of hybrids among plants - Cases of sterility of mongrels — Parallelism between crossing ...
... hybrids and of the infertility of mongrels -The effects of close interbreeding - Mr . Huth's objections - Fertile hybrids among animals - Fertility of hybrids among plants - Cases of sterility of mongrels — Parallelism between crossing ...
Page 152
... hybrids and of the infertility of mongrels -The effects of close inter - breeding -- Mr . Huth's objections -- Fertile hybrids among animals - Fertility of hybrids among plants - Cases of sterility of mongrels - Parallelism between ...
... hybrids and of the infertility of mongrels -The effects of close inter - breeding -- Mr . Huth's objections -- Fertile hybrids among animals - Fertility of hybrids among plants - Cases of sterility of mongrels - Parallelism between ...
Page 153
... hybrid offspring to be also fertile , this fact would have been held to prove them to be not species but varieties . On ... hybrids , as in the well - known case of the mule ; while almost all domestic varieties , when crossed , produce ...
... hybrid offspring to be also fertile , this fact would have been held to prove them to be not species but varieties . On ... hybrids , as in the well - known case of the mule ; while almost all domestic varieties , when crossed , produce ...
Page 155
... hybrids when the pollen of the latter is applied to the stigma of the former plant . But the same experimenter , Kölreuter , tried in vain , more than two hundred times during eight years , to cross them by applying the pollen of M ...
... hybrids when the pollen of the latter is applied to the stigma of the former plant . But the same experimenter , Kölreuter , tried in vain , more than two hundred times during eight years , to cross them by applying the pollen of M ...
Page 156
... hybrids ; but those raised from one variety were less sterile , in all the experiments , than the hybrids from the four other varieties . Again , most of the species of the genus Nicotiana have been crossed , and freely produce hybrids ...
... hybrids ; but those raised from one variety were less sterile , in all the experiments , than the hybrids from the four other varieties . Again , most of the species of the genus Nicotiana have been crossed , and freely produce hybrids ...
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abundant adapted adduced allied species America amount animals and plants appears birds breed brilliant butterflies carnivora cause characters climate closely allied colours of animals common conspicuous continued cross-fertilisation crossed curious Darwin dicotyledons distinct species domestic animals effects eggs Eocene evidence explained extinct facts faculty favourable female fertile fertilisation flowers genera genus geological groups habits hybrids important increase individuals infertility inhabit insects intercrossing kind large number larvæ less living male mammalia mammals markings marsupials mimicry Miocene mode modified moths natural selection naturalists nests occur offspring organs Origin of Species peculiar pigeons Pliocene pollen portion possess probably produced Professor proportion protectively coloured pupa regions remarkable resemblance seeds self-fertilisation Silurian specimens spots sterility structure struggle for existence supposed surface tail theory tints tion toes trees tropical usually variability variation varied varieties vegetation warning colours whole wild wings Zealand