The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London EditionBurt, 1890 - 538페이지 |
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152 페이지
... sometimes has very distinct tranverse bars on its legs , like those on the legs of the zebra . It has been asserted that these are plainest in the foal , and , from inquiries which I have made , I believe this to be true . The stripe on ...
... sometimes has very distinct tranverse bars on its legs , like those on the legs of the zebra . It has been asserted that these are plainest in the foal , and , from inquiries which I have made , I believe this to be true . The stripe on ...
439 페이지
... sometimes extremely different ; and as it has been used in classing varieties which have undergone a certain , and sometimes a consid- erable amount of modification , may not this same element of descent have been unconsciously used in ...
... sometimes extremely different ; and as it has been used in classing varieties which have undergone a certain , and sometimes a consid- erable amount of modification , may not this same element of descent have been unconsciously used in ...
468 페이지
... sometimes be- come well developed and yield milk . In regard to plants , the petals are sometimes rudimentary , and sometimes well developed in the individuals of the same species . In cer- tain plants having separated sexes Kölreuter ...
... sometimes be- come well developed and yield milk . In regard to plants , the petals are sometimes rudimentary , and sometimes well developed in the individuals of the same species . In cer- tain plants having separated sexes Kölreuter ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young