The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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14 페이지
... DOMESTIC VARIETIES ; DIFFICULTY OF DIS- TINGUISHING BETWEEN VARIETIES AND SPECIES ; ORIGIN OF DOMESTIC VARIETIES FROM ONE OR MORE SPECIES . When we look to the hereditary varieties or races of our domestic animals and plants , and ...
... DOMESTIC VARIETIES ; DIFFICULTY OF DIS- TINGUISHING BETWEEN VARIETIES AND SPECIES ; ORIGIN OF DOMESTIC VARIETIES FROM ONE OR MORE SPECIES . When we look to the hereditary varieties or races of our domestic animals and plants , and ...
16 페이지
... domestic animals will prob- ably forever remain vague . But I may here state that , looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild ...
... domestic animals will prob- ably forever remain vague . But I may here state that , looking to the domestic dogs of the whole world , I have , after a laborious collection of all known facts , come to the conclusion that several wild ...
134 페이지
... domestic animals were origin- ally chosen by uncivilized man because they were useful , and because they bred readily under confinement , and not because they were subsequently found capable of far- extended transportation , the common ...
... domestic animals were origin- ally chosen by uncivilized man because they were useful , and because they bred readily under confinement , and not because they were subsequently found capable of far- extended transportation , the common ...
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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 gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important 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 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 variability variations varieties vary whole widely different wings young