The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página v
... Domestic Varieties- Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently followed ...
... Domestic Varieties- Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one or more species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently followed ...
Página vii
... Domestic instincts , their origin - Natural instincts of the cuckoo , molothrus , ostrich , and parasitic bees - Slave - making ants - Hive - bee , its cell - making instinct- Changes of instinct and structure not necessarily ...
... Domestic instincts , their origin - Natural instincts of the cuckoo , molothrus , ostrich , and parasitic bees - Slave - making ants - Hive - bee , its cell - making instinct- Changes of instinct and structure not necessarily ...
Página xiv
... domestic productions . With respect to the means of modification , he attributed something to the direct action of the physical condi- tions of life , something to the crossing of already existing forms , and much to use and disuse ...
... domestic productions . With respect to the means of modification , he attributed something to the direct action of the physical condi- tions of life , something to the crossing of already existing forms , and much to use and disuse ...
Página xix
... domestic productions , from the changes which the embryos of many species undergo , from the difficulty of distinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he ...
... domestic productions , from the changes which the embryos of many species undergo , from the difficulty of distinguishing species and varieties , and from the principle of general gradation , that species have been modified ; and he ...
Página 5
... domestic varieties - Difficulty of distinguishing between varieties and species - Origin of domestic varieties from one or more species - Domestic pigeons , their differences and origin - Principles of selection , anciently followed ...
... domestic varieties - Difficulty of distinguishing between varieties and species - Origin of domestic varieties from one or more species - Domestic pigeons , their differences and origin - Principles of selection , anciently followed ...
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase 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 resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young