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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... genera in each country vary more frequently than the species of the smaller genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ...
... genera in each country vary more frequently than the species of the smaller genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and in having restricted ...
Página 6
... genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the de- scendants of that species . Furthermore , I am convinced that Natural Selection ...
... genera are lineal descendants of some other and generally extinct species , in the same manner as the acknowledged varieties of any one species are the de- scendants of that species . Furthermore , I am convinced that Natural Selection ...
Página 19
... genera originate under nature , it will be seen that we have no right to expect often to find a generic amount of difference in our do- mesticated races . In attempting to estimate the amount of structural difference between allied ...
... genera originate under nature , it will be seen that we have no right to expect often to find a generic amount of difference in our do- mesticated races . In attempting to estimate the amount of structural difference between allied ...
Página 23
... genera- tions , hardly two of them are alike , and then the diffi- culty of the task becomes manifest . Breeds of the Domestic Pigeon , their Differences and Origin . Believing that it is always best to study some special group , I have ...
... genera- tions , hardly two of them are alike , and then the diffi- culty of the task becomes manifest . Breeds of the Domestic Pigeon , their Differences and Origin . Believing that it is always best to study some special group , I have ...
Página 49
... genera . Isidore Geoffroy St. Hilaire has proved this in regard to size , and so it is with colour and probably with the length of hair . With respect to fleetness , which depends on many bodily characters , Eclipse was far fleeter ...
... genera . Isidore Geoffroy St. Hilaire has proved this in regard to size , and so it is with colour and probably with the length of hair . With respect to fleetness , which depends on many bodily characters , Eclipse was far fleeter ...
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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