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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... genus the stripes are either plainer or appear more com- monly in the young than in the old . Call the breeds of pigeons , some of which have bred true for centuries , species ; and how exactly parallel is the case with that of the ...
... genus the stripes are either plainer or appear more com- monly in the young than in the old . Call the breeds of pigeons , some of which have bred true for centuries , species ; and how exactly parallel is the case with that of the ...
286 ÆäÀÌÁö
... genus , as Dianthus , in which very many species can most readily be crossed ; and another genus , as Silene , in which the most persevering efforts have failed to produce between extremely close species a single hybrid . Even within ...
... genus , as Dianthus , in which very many species can most readily be crossed ; and another genus , as Silene , in which the most persevering efforts have failed to produce between extremely close species a single hybrid . Even within ...
436 ÆäÀÌÁö
... genus with the parent A , or those from I with parent I. But the existing genus F14 may be supposed to have been but slightly mod- ified , and it will then rank with the parent genus F , just as some few still living organisms belong to ...
... genus with the parent A , or those from I with parent I. But the existing genus F14 may be supposed to have been but slightly mod- ified , and it will then rank with the parent genus F , just as some few still living organisms belong to ...
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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 divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable 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 lamell©¡ larv©¡ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally 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