The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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xv 페이지
... produced , chiefly by intercrossing , but likewise by variation , all our existing species . In 1826 Professor Grant , in the concluding paragraph in his well known paper ( Edinburgh Philosophical Journal , ' vol . xiv . p . 283 ) on ...
... produced , chiefly by intercrossing , but likewise by variation , all our existing species . In 1826 Professor Grant , in the concluding paragraph in his well known paper ( Edinburgh Philosophical Journal , ' vol . xiv . p . 283 ) on ...
xvii 페이지
... produced by the conditions of life are gradual . He argues with much force on general grounds that species are not immutable productions . But I cannot see how the two supposed " impulses " account in a scientific sense for the numerous ...
... produced by the conditions of life are gradual . He argues with much force on general grounds that species are not immutable productions . But I cannot see how the two supposed " impulses " account in a scientific sense for the numerous ...
xx 페이지
... produced . I may add , that of the thirty - four authors named in this Historical Sketch , who believe in the modification of species , or at least disbelieve in separate acts of creation , twenty - seven have written on special ...
... produced . I may add , that of the thirty - four authors named in this Historical Sketch , who believe in the modification of species , or at least disbelieve in separate acts of creation , twenty - seven have written on special ...
7 페이지
... produce seeds . I cannot here give the details which I have collected and elsewhere published on this curious subject ; but to show how singular the laws are which determine the repro- duction of animals under confinement , I may ...
... produce seeds . I cannot here give the details which I have collected and elsewhere published on this curious subject ; but to show how singular the laws are which determine the repro- duction of animals under confinement , I may ...
8 페이지
... produced a single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may be named , can be pro- pagated by grafts , offsets , & c . , and sometimes by ...
... produced a single bud with a new and sometimes widely different character from that of the other buds on the same plant . These bud variations , as they may be named , can be pro- pagated by grafts , offsets , & c . , and sometimes by ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids 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 occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young