The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
도서 본문에서
44개의 결과 중 6 - 10개
46 페이지
... admit in words the truth of the universal struggle for life , or more difficult - at least I have found it so - than constantly to bear this conclusion in mind . Yet unless it be thoroughly engrained in the mind , the whole economy of ...
... admit in words the truth of the universal struggle for life , or more difficult - at least I have found it so - than constantly to bear this conclusion in mind . Yet unless it be thoroughly engrained in the mind , the whole economy of ...
78 페이지
... admit . It can act only when there are places in the natural polity of a district which can be better occupied by the modification of some of its existing inhabitants . The occurrence. 78 CIRCUMSTANCES FAVOURABLE TO THE [ CHAP . IV .
... admit . It can act only when there are places in the natural polity of a district which can be better occupied by the modification of some of its existing inhabitants . The occurrence. 78 CIRCUMSTANCES FAVOURABLE TO THE [ CHAP . IV .
79 페이지
... admit that specific forms can go on indefinitely increas- ing in number , many old forms must become extinct . That the number of specific forms has not indefinitely increased , geology plainly tells us ; and we shall presently attempt ...
... admit that specific forms can go on indefinitely increas- ing in number , many old forms must become extinct . That the number of specific forms has not indefinitely increased , geology plainly tells us ; and we shall presently attempt ...
91 페이지
... admit that the specialisation of organs , inasmuch as in this state they perform their functions . better , is an advantage to each being ; and hence the accumulation of variations tending towards specialisation is within the scope of ...
... admit that the specialisation of organs , inasmuch as in this state they perform their functions . better , is an advantage to each being ; and hence the accumulation of variations tending towards specialisation is within the scope of ...
95 페이지
... admit that the mutual relations of organic beings are more important ; and as the number of species in any country goes on increasing , the organic conditions of life must become more and more complex . Consequently there seems at first ...
... admit that the mutual relations of organic beings are more important ; and as the number of species in any country goes on increasing , the organic conditions of life must become more and more complex . Consequently there seems at first ...
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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 facts 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 occur 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