Darwinism Stated by Darwin Himself: Characteristic Passages from the Writings of Charles DarwinD. Appleton, 1890 - Всего страниц: 351 |
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Стр. ix
... 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 Comparative Fertility of Male and Female ...
... 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 Comparative Fertility of Male and Female ...
Стр. 6
... crossed one with another , the offspring did not profit in the least by the cross . The curious cases of plants ... crossing is concerned , unless their sexual elements are thus. 6 DARWINISM STATED BY DARWIN HIMSELF . Advantages of Cross ...
... crossed one with another , the offspring did not profit in the least by the cross . The curious cases of plants ... crossing is concerned , unless their sexual elements are thus. 6 DARWINISM STATED BY DARWIN HIMSELF . Advantages of Cross ...
Стр. 7
Characteristic Passages from the Writings of Charles Darwin Charles Darwin. crossing is concerned , unless their sexual elements are thus affected . That every organism is acted on to a cer- tain extent by a change in its environment ...
Characteristic Passages from the Writings of Charles Darwin Charles Darwin. crossing is concerned , unless their sexual elements are thus affected . That every organism is acted on to a cer- tain extent by a change in its environment ...
Стр. 8
... CROSSING . In my experiments with Digitalis pur- Page 447 . purea , some flowers on a wild plant were self- fertilized , and others were crossed with pollen from another plant growing within two or three feet distance . The crossed and ...
... CROSSING . In my experiments with Digitalis pur- Page 447 . purea , some flowers on a wild plant were self- fertilized , and others were crossed with pollen from another plant growing within two or three feet distance . The crossed and ...
Стр. 9
... crossed by a dis- tant plant growing under somewhat different condi- tions . Plants thus crossed often produce an unusually large number of seeds ; a striking instance of this fact is afforded by the Bignonia , which was fertilized by ...
... crossed by a dis- tant plant growing under somewhat different condi- tions . Plants thus crossed often produce an unusually large number of seeds ; a striking instance of this fact is afforded by the Bignonia , which was fertilized by ...
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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