Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1890 - Всего страниц: 351 |
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Стр. ix
... Sexual Elements in Plants Experiments in Crossing The Struggle for Existence among Seeds . Practical Application of these Views . Marriages of First Cousins Development of the Two Sexes in Plants Why the Sexes have been reseparated ...
... Sexual Elements in Plants Experiments in Crossing The Struggle for Existence among Seeds . Practical Application of these Views . Marriages of First Cousins Development of the Two Sexes in Plants Why the Sexes have been reseparated ...
Стр. 6
... sexual elements have been in some de- gree differentiated ; and , 2. That the injury from self- fertilization follows from the want of such differentiation in the sexual elements . These two propositions are fully established by my ...
... sexual elements have been in some de- gree differentiated ; and , 2. That the injury from self- fertilization follows from the want of such differentiation in the sexual elements . These two propositions are fully established by my ...
Стр. 7
... sexual elements are thus affected . That every organism is acted on to a cer- tain extent by a change in its environment will not , I pre- sume , be disputed . It is hardly necessary to advance evidence on this head ; we can perceive ...
... sexual elements are thus affected . That every organism is acted on to a cer- tain extent by a change in its environment will not , I pre- sume , be disputed . It is hardly necessary to advance evidence on this head ; we can perceive ...
Стр. 8
... sexual elements , How can two or more plants growing close together , either in their native country or in a garden , be differently acted on , inasmuch as they appear to be exposed to exactly the same conditions ? EXPERIMENTS IN ...
... sexual elements , How can two or more plants growing close together , either in their native country or in a garden , be differently acted on , inasmuch as they appear to be exposed to exactly the same conditions ? EXPERIMENTS IN ...
Стр. 10
... sexual nature . And , secondly , that the advantages of cross- fertilization depend on the sexual elements of the parents having become in some degree differentiated by the ex- posure of their progenitors to different conditions , or ...
... sexual nature . And , secondly , that the advantages of cross- fertilization depend on the sexual elements of the parents having become in some degree differentiated by the ex- posure of their progenitors to different conditions , or ...
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Часто встречающиеся слова и выражения
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