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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Página 8
... same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt. 8 VARIATION UNDER DOMESTICATION . [ CHAP . I.
... same manner . It is extremely difficult to come to any conclusion in regard to the extent of the changes which have been thus definitely induced . There can , however , be little doubt. 8 VARIATION UNDER DOMESTICATION . [ CHAP . I.
Página 9
... , whether extremely slight or strongly marked , which appear amongst many individuals living together , may be considered as the indefinite effects of the conditions of life on. CHAP . I. ] VARIATION UNDER DOMESTICATION . 9.
... , whether extremely slight or strongly marked , which appear amongst many individuals living together , may be considered as the indefinite effects of the conditions of life on. CHAP . I. ] VARIATION UNDER DOMESTICATION . 9.
Página 10
... extremely sensitive to any change in the conditions , and partly from the similarity , as Kölreuter and others have remarked , between the variability which follows from the crossing of distinct species , and that which may be observed ...
... extremely sensitive to any change in the conditions , and partly from the similarity , as Kölreuter and others have remarked , between the variability which follows from the crossing of distinct species , and that which may be observed ...
Página 37
... extremely alike the flowers ; how unlike the flowers of the heartsease are , and how alike the leaves ; how much the fruit of the different kinds of goose- berries differ in size , colour , shape , and. CHAP . I. ] 37 SELECTION BY MAN .
... extremely alike the flowers ; how unlike the flowers of the heartsease are , and how alike the leaves ; how much the fruit of the different kinds of goose- berries differ in size , colour , shape , and. CHAP . I. ] 37 SELECTION BY MAN .
Página 44
... extremely small differences , and it is in human nature to value any novelty , however slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in the individuals of the same ...
... extremely small differences , and it is in human nature to value any novelty , however slight , in one's own possession . Nor must the value which would formerly have been set on any slight differences in the individuals of the same ...
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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