On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página ii
... VARIOUS CONTRIVANCES BY WHICH ORCHIDS ARE FERTILIZED BY INSECTS . Revised edition , with Illustrations . 12mo . Cloth , $ 1.75 . THE EFFECTS OF CROSS AND SELF FERTILIZATION IN THE VEGETABLE KINGDOM . 12mo . Cloth , $ 2.00 . DIFFERENT ...
... VARIOUS CONTRIVANCES BY WHICH ORCHIDS ARE FERTILIZED BY INSECTS . Revised edition , with Illustrations . 12mo . Cloth , $ 1.75 . THE EFFECTS OF CROSS AND SELF FERTILIZATION IN THE VEGETABLE KINGDOM . 12mo . Cloth , $ 2.00 . DIFFERENT ...
Página vii
... various in degree , not universal , affected by close interbreeding , re- moved by domestication - Laws governing the sterility of hybrids — Sterility not a special endowment , but incidental on other differences , not accumulated by ...
... various in degree , not universal , affected by close interbreeding , re- moved by domestication - Laws governing the sterility of hybrids — Sterility not a special endowment , but incidental on other differences , not accumulated by ...
Página xi
... various subjects , according as the evidence has become somewhat stronger or weaker . The more important corrections and some additions in the pre- sent volume are tabulated on the following page , for the convenience of those ...
... various subjects , according as the evidence has become somewhat stronger or weaker . The more important corrections and some additions in the pre- sent volume are tabulated on the following page , for the convenience of those ...
Página xiv
... various degenerations of the same type . It was not until 1828 that he published his conviction that the same forms have not been perpetuated since the origin of all things . Geoffroy seems to have relied chiefly on the conditions of ...
... various degenerations of the same type . It was not until 1828 that he published his conviction that the same forms have not been perpetuated since the origin of all things . Geoffroy seems to have relied chiefly on the conditions of ...
Página 7
... various organs . With respect to what I have called the indirect action of changed conditions , namely , through the reproductive system being affected , we may infer that variability is thus induced , partly from the fact of this ...
... various organs . With respect to what I have called the indirect action of changed conditions , namely , through the reproductive system being affected , we may infer that variability is thus induced , partly from the fact of this ...
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Términos y frases comunes
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 formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number 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 tend theory tion variability variations varieties vary whilst whole wings young