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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... forms , Mr. Babington gives 251 species , whereas Mr. Bentham gives only 112 - a difference of 139 doubtful forms ! Among animals which unite for each birth , and which are highly locomotive , doubtful forms , ranked by one zoologist as ...
... forms , Mr. Babington gives 251 species , whereas Mr. Bentham gives only 112 - a difference of 139 doubtful forms ! Among animals which unite for each birth , and which are highly locomotive , doubtful forms , ranked by one zoologist as ...
162 페이지
... forms occur , they are much rarer numerically than the forms which they con- nect . Now , if we may trust these facts and inferences , and conclude that varieties linking two other varieties to- gether generally have existed in lesser ...
... forms occur , they are much rarer numerically than the forms which they con- nect . Now , if we may trust these facts and inferences , and conclude that varieties linking two other varieties to- gether generally have existed in lesser ...
400 페이지
... forms . So again in the mountainous island of Fernando Po , in the Gulf of Guinea , Mr. Mann found temperate . European forms begining to appear at the height of about five thousand feet . On the mountains of Panama , at the height of ...
... forms . So again in the mountainous island of Fernando Po , in the Gulf of Guinea , Mr. Mann found temperate . European forms begining to appear at the height of about five thousand feet . On the mountains of Panama , at the height of ...
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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