Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1890 - Всего страниц: 351 |
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Стр. 1
... any one direction , commonly moves back to the opposite side , not , however , returning along the same line . Afterward other irregular ellipses or ovals. CONTENTS I PAGE THE MOVEMENTS AND HABITS OF PLANTS PAGE PAGE PAGE.
... any one direction , commonly moves back to the opposite side , not , however , returning along the same line . Afterward other irregular ellipses or ovals. CONTENTS I PAGE THE MOVEMENTS AND HABITS OF PLANTS PAGE PAGE PAGE.
Стр. 2
... side , so as to be out of the way . The young leaves of clematis , on the other hand , prepare for action by tem- porarily curving themselves downward , so as to serve as grapnels . 2. If a twining plant or a tendril gets by any ...
... side , so as to be out of the way . The young leaves of clematis , on the other hand , prepare for action by tem- porarily curving themselves downward , so as to serve as grapnels . 2. If a twining plant or a tendril gets by any ...
Стр. 3
... side . Extremely slight pressure often suffices . If the pressure be not permanent , the part in question straight- ens itself and is again ready to bend on being touched . 6. Tendrils , soon after clasping a support , but not after a ...
... side . Extremely slight pressure often suffices . If the pressure be not permanent , the part in question straight- ens itself and is again ready to bend on being touched . 6. Tendrils , soon after clasping a support , but not after a ...
Стр. 21
... side of the flower , as is actually the case with Malaxis paludosa , and some species of Catasetum , etc. This change , it is obvious , might be simply effected by the continued selection of varieties which had their ovaria less and ...
... side of the flower , as is actually the case with Malaxis paludosa , and some species of Catasetum , etc. This change , it is obvious , might be simply effected by the continued selection of varieties which had their ovaria less and ...
Стр. 24
... sides ( as first proved by Pfeffer ) , yet they differ essentially in being excited chiefly by changes of temperature instead of light ; and in being effected , as far as we can judge , for a differ- ent purpose . Hardly any one ...
... sides ( as first proved by Pfeffer ) , yet they differ essentially in being excited chiefly by changes of temperature instead of light ; and in being effected , as far as we can judge , for a differ- ent purpose . Hardly any one ...
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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