The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538ÆäÀÌÁö |
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xvii ÆäÀÌÁö
... Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently followed , their Effects - Methodical and Unconscious Selection- Unknown Origin of our ...
... Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently followed , their Effects - Methodical and Unconscious Selection- Unknown Origin of our ...
xix ÆäÀÌÁö
... origin - Instincts graduated - Aphides and ants - Instincts variable - Domestic instincts , their origin - Natural instincts of the cuckoo , molothrus , ostrich and parasitic bees - Slave- making ants - Hive - bee , its cell - making ...
... origin - Instincts graduated - Aphides and ants - Instincts variable - Domestic instincts , their origin - Natural instincts of the cuckoo , molothrus , ostrich and parasitic bees - Slave- making ants - Hive - bee , its cell - making ...
37 ÆäÀÌÁö
... origin of our domestic races of ani- mals and plants . Changed conditions of life are of the highest importance in causing variability , both by acting directly on the organization , and indirectly by affecting the reproductive system ...
... origin of our domestic races of ani- mals and plants . Changed conditions of life are of the highest importance in causing variability , both by acting directly on the organization , and indirectly by affecting the reproductive system ...
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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 lamell©¡ larv©¡ 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