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 4
... slight variations . I will then pass on to the 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 ...
... slight variations . I will then pass on to the 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 ...
Página 9
... slight changes , such as size from the amount of food , colour from the nature of the food , thickness of the skin and hair from climate , & c . Each of the endless variations which we see in the plumage of our fowls must have had some ...
... slight changes , such as size from the amount of food , colour from the nature of the food , thickness of the skin and hair from climate , & c . Each of the endless variations which we see in the plumage of our fowls must have had some ...
Página 10
... slight changes in the surrounding conditions . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confine- ment , even when the male and female unite . How many animals there ...
... slight changes in the surrounding conditions . Nothing is more easy than to tame an animal , and few things more difficult than to get it to breed freely under confine- ment , even when the male and female unite . How many animals there ...
Página 14
... slight degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of considerable ...
... slight degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of considerable ...
Página 17
... slight deviations in their structure , in such case , I grant that we could deduce nothing from domestic varieties in regard to species . But there is not a shadow of evidence in favour of this view : to assert that we could not breed ...
... slight deviations in their structure , in such case , I grant that we could deduce nothing from domestic varieties in regard to species . But there is not a shadow of evidence in favour of this view : to assert that we could not breed ...
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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