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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... sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may be named , can be propagated by grafts , offsets , etc. , and sometimes by seed . They occur rarely under nature ...
... sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may be named , can be propagated by grafts , offsets , etc. , and sometimes by seed . They occur rarely under nature ...
152 페이지
... sometimes has very distinct tranverse bars on its legs , like those on the legs of the zebra . It has been asserted that these are plainest in the foal , and , from inquiries which I have made , I believe this to be true . The stripe on ...
... sometimes has very distinct tranverse bars on its legs , like those on the legs of the zebra . It has been asserted that these are plainest in the foal , and , from inquiries which I have made , I believe this to be true . The stripe on ...
468 페이지
... sometimes be- come well developed and yield milk . In regard to plants , the petals are sometimes rudimentary , and sometimes well developed in the individuals of the same species . In cer- tain plants having separated sexes Kölreuter ...
... sometimes be- come well developed and yield milk . In regard to plants , the petals are sometimes rudimentary , and sometimes well developed in the individuals of the same species . In cer- tain plants having separated sexes Kölreuter ...
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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 lamellæ larvæ 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