Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1890 - Всего страниц: 351 |
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Стр. viii
... results , in the animate and inanimate world , which now offer to the student of nature boundless scope for observation and inquiry . " -The Christian World . " Let us see , in the funeral honors paid within these holy pre- cincts to ...
... results , in the animate and inanimate world , which now offer to the student of nature boundless scope for observation and inquiry . " -The Christian World . " Let us see , in the funeral honors paid within these holy pre- cincts to ...
Стр. x
... .. . 85 Climate as a Check to Increase Influence of Insects in the Struggle for Existence No such Thing as Change in the Result of the Struggle . 86 . 88 90 V. NATURAL SELECTION ; OR , THE SURVIVAL OF THE. X CONTENTS .
... .. . 85 Climate as a Check to Increase Influence of Insects in the Struggle for Existence No such Thing as Change in the Result of the Struggle . 86 . 88 90 V. NATURAL SELECTION ; OR , THE SURVIVAL OF THE. X CONTENTS .
Стр. 6
... can lead to no beneficial results , as far as crossing is concerned , unless their sexual elements are thus. 6 DARWINISM STATED BY DARWIN HIMSELF . Advantages of Cross-Fertilization Potency of the Sexual Elements in Plants.
... can lead to no beneficial results , as far as crossing is concerned , unless their sexual elements are thus. 6 DARWINISM STATED BY DARWIN HIMSELF . Advantages of Cross-Fertilization Potency of the Sexual Elements in Plants.
Стр. 10
... result . It is a common practice with horticulturists to obtain seeds from another place having a very different soil , so as to avoid raising plants for a long succession of genera- tions under the same conditions ; but , with all the ...
... result . It is a common practice with horticulturists to obtain seeds from another place having a very different soil , so as to avoid raising plants for a long succession of genera- tions under the same conditions ; but , with all the ...
Стр. 11
... results than a mere exchange of seeds . We have seen in my experiments how wonderfully the offspring profited in height , weight , hardiness , and fer- tility , by crosses of this kind . For instance , plants of Ipomoea thus crossed ...
... results than a mere exchange of seeds . We have seen in my experiments how wonderfully the offspring profited in height , weight , hardiness , and fer- tility , by crosses of this kind . For instance , plants of Ipomoea thus crossed ...
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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