The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCollier Books, 1962 - 512 páginas |
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Página 42
... breeds several truly - inherited sub- breeds , or species , as he would call them , could be shown him . Great as are the differences between the breeds of the pigeon , I am fully convinced that the common opinion of naturalists is ...
... breeds several truly - inherited sub- breeds , or species , as he would call them , could be shown him . Great as are the differences between the breeds of the pigeon , I am fully convinced that the common opinion of naturalists is ...
Página 43
... breeds , and some truly wild breeds , have , besides the two black bars , the wings chequered with black . These several marks do not occur together in any other species of the whole family . Now , in every one of the domestic breeds ...
... breeds , and some truly wild breeds , have , besides the two black bars , the wings chequered with black . These several marks do not occur together in any other species of the whole family . Now , in every one of the domestic breeds ...
Página 45
... breeds . Secondly , that , although an English carrier or a short - faced tumbler differs immensely in certain characters from the rock - pigeon , yet that , by comparing the several sub - breeds of these two races , more especially ...
... breeds . Secondly , that , although an English carrier or a short - faced tumbler differs immensely in certain characters from the rock - pigeon , yet that , by comparing the several sub - breeds of these two races , more especially ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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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 common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation 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 offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil pollen present principle probably produced progenitor 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