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 vi
... not in all cases absolutely perfect- The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection 133-167 - CHAPTER VII . MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL vi CONTENTS .
... not in all cases absolutely perfect- The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection 133-167 - CHAPTER VII . MISCELLANEOUS OBJECTIONS TO THE THEORY OF NATURAL vi CONTENTS .
Página xiv
... perfect gradation of forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the ...
... perfect gradation of forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the ...
Página 1
... , some brief extracts from my manu- scripts . This Abstract , which I now publish , must necessarily be im perfect . I cannot here give references and authorities for my several statements ; and I must trust to the reader.
... , some brief extracts from my manu- scripts . This Abstract , which I now publish , must necessarily be im perfect . I cannot here give references and authorities for my several statements ; and I must trust to the reader.
Página 11
... perfect reversion had ensued . It would be necessary in order to prevent the effects of intercrossing , that only a single variety should have been turned loose in its new home . Neverthe- less , as our varieties certainly do ...
... perfect reversion had ensued . It would be necessary in order to prevent the effects of intercrossing , that only a single variety should have been turned loose in its new home . Neverthe- less , as our varieties certainly do ...
Página 12
... perfect fertility of varieties when crossed , —a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely - allied species of the same genus in a state of ...
... perfect fertility of varieties when crossed , —a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as do the closely - allied species of the same genus in a state of ...
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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