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 |
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30 페이지
... 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 ranges . BEFORE applying the principles arrived at in the last chapter to ...
... 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 ranges . BEFORE applying the principles arrived at in the last chapter to ...
32 페이지
... genera of insects and of Brachiopod shells . In most polymorphic genera some of the species have fixed and definite characters . Genera which are polymorphic in one country seem to be , with a few exceptions , polymorphic in other ...
... genera of insects and of Brachiopod shells . In most polymorphic genera some of the species have fixed and definite characters . Genera which are polymorphic in one country seem to be , with a few exceptions , polymorphic in other ...
34 페이지
... genera . Under genera , including the most polymorphic forms , Mr. Babington gives 251 species , whereas Mr. Bentham gives only 112 , -a difference of 139 doubtful forms ! Amongst animals which unite for each birth , and which are ...
... genera . Under genera , including the most polymorphic forms , Mr. Babington gives 251 species , whereas Mr. Bentham gives only 112 , -a difference of 139 doubtful forms ! Amongst animals which unite for each birth , and which are ...
40 페이지
... Genera in each Country vary more frequently than the Species of the Smaller Genera . If the plants inhabiting a country , as described in any Flora , be divided into two equal masses , all those in the larger genera ( ie . , those ...
... Genera in each Country vary more frequently than the Species of the Smaller Genera . If the plants inhabiting a country , as described in any Flora , be divided into two equal masses , all those in the larger genera ( ie . , those ...
41 페이지
... genera , or those including many species , a larger proportional number of dominant species . But so many causes tend to obscure this result , that I am surprised that my tables show even a small majority on the side of the larger genera ...
... genera , or those including many species , a larger proportional number of dominant species . But so many causes tend to obscure this result , that I am surprised that my tables show even a small majority on the side of the larger genera ...
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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