The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
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... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of . Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from ...
... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of . Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from ...
Página 4
... variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , however , be enabled to ...
... variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , however , be enabled to ...
Página 6
... species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of Variability -. 6 INTRODUCTION .
... species . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of Variability -. 6 INTRODUCTION .
Página 7
... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one ...
... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one ...
Página 8
... variability may be partly connected with excess of food . It seems clear that organic beings must be ex- posed during several generations to new conditions to cause any great amount of variation ; and that , when the organisation has ...
... variability may be partly connected with excess of food . It seems clear that organic beings must be ex- posed during several generations to new conditions to cause any great amount of variation ; and that , when the organisation has ...
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Términos y frases comunes
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 descendants developed difficulty distinct species disuse divergence 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 increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young