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 12
... wild - duck ; and this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild parents . The great and inherited development of the udders in cows and goats in countries where they are ...
... wild - duck ; and this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild parents . The great and inherited development of the udders in cows and goats in countries where they are ...
Página 16
... wild , gradually but invariably revert in character to their aboriginal stocks . Hence it has been argued that no deductions can be drawn from domestic races to species in a state of nature . I have in vain endeavoured to discover on ...
... wild , gradually but invariably revert in character to their aboriginal stocks . Hence it has been argued that no deductions can be drawn from domestic races to species in a state of nature . I have in vain endeavoured to discover on ...
Página 17
... wild aboriginal stock . Whether or not the experiment would succeed , is not of great importance for our line of argu- ment ; for by the experiment itself the conditions of life are changed . If it could be shown that our domestic ...
... wild aboriginal stock . Whether or not the experiment would succeed , is not of great importance for our line of argu- ment ; for by the experiment itself the conditions of life are changed . If it could be shown that our domestic ...
Página 19
... wild stock . It has often been assumed that man has chosen for domestication animals and plants having an extraordi- nary inherent tendency to vary , and likewise to withstand diverse climates . I do not dispute that these capacities ...
... wild stock . It has often been assumed that man has chosen for domestication animals and plants having an extraordi- nary inherent tendency to vary , and likewise to withstand diverse climates . I do not dispute that these capacities ...
Página 20
... wild species . The argument mainly relied on by those who believe in the multiple origin of our domestic animals is , that we find in the most ancient times , on the monuments of Egypt , and in the lake - habitations of Switzerland ...
... wild species . The argument mainly relied on by those who believe in the multiple origin of our domestic animals is , that we find in the most ancient times , on the monuments of Egypt , and in the lake - habitations of Switzerland ...
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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