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 158
... common pro- genitor , or of its early descendants , became variable , variations of this part would , it is highly probable , be taken advantage of by natural and sexual selection , in order to fit the several species to their several ...
... common pro- genitor , or of its early descendants , became variable , variations of this part would , it is highly probable , be taken advantage of by natural and sexual selection , in order to fit the several species to their several ...
Página 222
... common goose . In this latter bird , the lamella of the upper mandible are much coarser than in the common duck , almost confluent , about 27 in number on each side , and terminating upwards in teeth - like knobs . The palate is also ...
... common goose . In this latter bird , the lamella of the upper mandible are much coarser than in the common duck , almost confluent , about 27 in number on each side , and terminating upwards in teeth - like knobs . The palate is also ...
Página 415
... common . But the three genera on the left hand have , on this same principle , much in common , and form a sub - family , distinct from that containing the next two genera on the right hand , which diverged from a common parent at the ...
... common . But the three genera on the left hand have , on this same principle , much in common , and form a sub - family , distinct from that containing the next two genera on the right hand , which diverged from a common parent at the ...
Contenido
An Historical Sketch | 15 |
Introduction | 25 |
Variation Under Nature | 58 |
Derechos de autor | |
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Otras ediciones - Ver todas
The Origin of Species by Means of Natural Selection: Or, The ..., Volumen2 Charles Darwin Vista de fragmentos - 1972 |
The Origin of Species by Means of Natural Selection: Or, The Preservation of ... Charles Darwin Vista de fragmentos - 1962 |
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