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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289 페이지
... mean by sterility being inci- dental on other differences , and not a specially endowed quality . As the capacity of ... means absolutely governed by systematic affinity . Although many distinct genera within the same OF FIRST CROSSES ...
... mean by sterility being inci- dental on other differences , and not a specially endowed quality . As the capacity of ... means absolutely governed by systematic affinity . Although many distinct genera within the same OF FIRST CROSSES ...
318 페이지
... means : Mr. Croll gives the following illus- tration : Take a narrow strip of paper , eighty - three feet four inches in length , and stretch it along the wall of a large hall ; then mark off at one end the tenth of an inch . This tenth ...
... means : Mr. Croll gives the following illus- tration : Take a narrow strip of paper , eighty - three feet four inches in length , and stretch it along the wall of a large hall ; then mark off at one end the tenth of an inch . This tenth ...
373 페이지
... Means of dispersal by changes of climate and of the level of the land , and by occasional means - Dispersal during the Glacial period— Alternate Glacial periods in the North and South . IN considering the distribution of organic beings ...
... Means of dispersal by changes of climate and of the level of the land , and by occasional means - Dispersal during the Glacial period— Alternate Glacial periods in the North and South . IN considering the distribution of organic beings ...
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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