The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Том 1AMS Press, 1972 - Всего страниц: 479 This is a reproduction of the original artefact. Generally these books are created from careful scans of the original. This allows us to preserve the book accurately and present it in the way the author intended. Since the original versions are generally quite old, there may occasionally be certain imperfections within these reproductions. We're happy to make these classics available again for future generations to enjoy! |
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Стр. 115
... trees bear only female flowers ; these have a full - sized pistil , and four stamens with shrivelled anthers , in which not a grain of pollen can be detected . Having found a female tree exactly sixty yards from a male tree , I put the ...
... trees bear only female flowers ; these have a full - sized pistil , and four stamens with shrivelled anthers , in which not a grain of pollen can be detected . Having found a female tree exactly sixty yards from a male tree , I put the ...
Стр. 122
... tree covered with innumerable flowers , it may be objected that pollen could seldom be carried from tree to tree , and at most only from flower to flower on the same tree ; and flowers on the same tree can be considered as distinct ...
... tree covered with innumerable flowers , it may be objected that pollen could seldom be carried from tree to tree , and at most only from flower to flower on the same tree ; and flowers on the same tree can be considered as distinct ...
Стр. 123
... tree , pollen must be regularly carried from flower to flower ; and this will give a better chance of pollen being occasionally carried from tree to tree . That trees belonging to all Orders have their sexes more often separated than ...
... tree , pollen must be regularly carried from flower to flower ; and this will give a better chance of pollen being occasionally carried from tree to tree . That trees belonging to all Orders have their sexes more often separated than ...
Содержание
CHAPTER I | 5 |
VARIATION UNDER NATURE | 51 |
Its bearing on natural selectionThe term used in a wide sense | 75 |
Авторские права | |
Не показаны другие разделы: 5
Часто встречающиеся слова и выражения
acquired adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree developed difficulty distinct species disuse domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important improved increase in number individual differences inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less likewise males manner Melipona Mivart natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species perfect period pigeons pollen pollen-grains present preserved principle probably produced progenitor quadrupeds rank Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion transitional tree variability variations varieties vary widely wings young