The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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3 페이지
... slight variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately , be com- pelled to treat this subject far too briefly , as it can be treated properly only by giving long ...
... slight variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately , be com- pelled to treat this subject far too briefly , as it can be treated properly only by giving long ...
6 페이지
... 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 , etc. 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 , etc. Each of the endless variations which we see in the plumage of our fowls must have had some ...
7 페이지
... 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 ...
9 페이지
... 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 ...
11 페이지
... 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 our ...
... 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 our ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely fact favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young