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 vii
... widely different from those of their allies - Organs of extreme perfection - Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect - The law of ...
... widely different from those of their allies - Organs of extreme perfection - Modes of transition - Cases of difficulty - Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect - The law of ...
Página 6
... widely and is very numerous , and why another allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare and , as I believe , the future success and ...
... widely and is very numerous , and why another allied species has a narrow range and is rare ? Yet these relations are of the highest importance , for they determine the present welfare and , as I believe , the future success and ...
Página 11
... , of plants which have suddenly produced a single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may. CHAP . I. ] VARIATION UNDER DOMESTICATION . 11.
... , of plants which have suddenly produced a single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may. CHAP . I. ] VARIATION UNDER DOMESTICATION . 11.
Página 45
... widely , and will be recognised as something distinct and valuable , and will then probably first receive a provincial name . In semi - civilised countries , with littie free communication , the spreading of a new sub - breed would be a ...
... widely , and will be recognised as something distinct and valuable , and will then probably first receive a provincial name . In semi - civilised countries , with littie free communication , the spreading of a new sub - breed would be a ...
Página 52
... widely different animals . Thus pigs have occasionally been born with a sort of proboscis , and if any wild species of the same genus had naturally possessed a proboscis , it might have been argued that this had appeared as a ...
... widely different animals . Thus pigs have occasionally been born with a sort of proboscis , and if any wild species of the same genus had naturally possessed a proboscis , it might have been argued that this had appeared as a ...
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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