Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1890 - Всего страниц: 351 |
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Стр. 6
... offspring did not profit in the least by the cross . The curious cases of plants which can fer- Page 451 . tilize and be fertilized by any other individual of the same species , but are altogether sterile with their own pollen , become ...
... offspring did not profit in the least by the cross . The curious cases of plants which can fer- Page 451 . tilize and be fertilized by any other individual of the same species , but are altogether sterile with their own pollen , become ...
Стр. 7
... offspring , though the confinement may be far from close ; and of plants ren- dered sterile by cultivation . But hardly any cases afford more striking evidence how powerfully a change in the conditions of life acts on the sexual ...
... offspring , though the confinement may be far from close ; and of plants ren- dered sterile by cultivation . But hardly any cases afford more striking evidence how powerfully a change in the conditions of life acts on the sexual ...
Стр. 8
... offspring would have been reduced to the same state as some of the plants in my experiments -such as the intercrossed plants of the ninth generation of Ipomoea , or the self - fertilized plants of the eighth gen- eration of Mimulus , or ...
... offspring would have been reduced to the same state as some of the plants in my experiments -such as the intercrossed plants of the ninth generation of Ipomoea , or the self - fertilized plants of the eighth gen- eration of Mimulus , or ...
Стр. 11
... offspring profited in height , weight , hardiness , and fer- tility , by crosses of this kind . For instance , plants of Ipomoea thus crossed were to the intercrossed plants of the same stock , with which they grew in competition , as ...
... offspring profited in height , weight , hardiness , and fer- tility , by crosses of this kind . For instance , plants of Ipomoea thus crossed were to the intercrossed plants of the same stock , with which they grew in competition , as ...
Стр. 12
... can be propagated asexually . Why then have the two sexes been developed , and why do males exist which can not themselves produce offspring ? The an- swer. 12 DARWINISM STATED BY DARWIN HIMSELF . Development of the Two Sexes in Plants.
... can be propagated asexually . Why then have the two sexes been developed , and why do males exist which can not themselves produce offspring ? The an- swer. 12 DARWINISM STATED BY DARWIN HIMSELF . Development of the Two Sexes in Plants.
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acid acquired action adapted admit allied animals apes appear become believe birds body breeds cause character climate closely compared cotyledons crossed degree descended developed distinct species disuse domestic doubt early effects eggs embryo existence extinct eyes fact female fertilization forms gemmules genera genus geotropism Glacial habits hairs hermaphrodites highly horses increase individuals inhabitants inherited insects instance instincts islands kinds labellum lancelet larvæ leaves less living lower animals Malaxis paludosa males mammals manner mental millimetre modified monkeys movements muscles natural selection naturalists observed occasionally offspring organs Origin of Species ovules papillæ parent peculiar period pigeon plants points pollen pollinium possess present prey probably produced progenitors Quadrumana quadrupeds races radicles remarkable resemble rudimentary savages seedlings seeds seems sexes sexual elements sexual selection slight structure suppose surface tend tendency tion transmitted utricle variability variations varieties various vertebræ whole wild worms young