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 74
... tend to become converted into new and distinct species . Thus the larger genera tend to become larger ; and throughout nature the forms of life which are now domi- nant tend to become still more dominant by leaving many modified and ...
... tend to become converted into new and distinct species . Thus the larger genera tend to become larger ; and throughout nature the forms of life which are now domi- nant tend to become still more dominant by leaving many modified and ...
Página 134
... tend to spread and supplant many others . Alph . de Can- dolle has shown that those species which spread widely , tend generally to spread very widely ; consequently , they will tend to supplant and exterminate several species in ...
... tend to spread and supplant many others . Alph . de Can- dolle has shown that those species which spread widely , tend generally to spread very widely ; consequently , they will tend to supplant and exterminate several species in ...
Página 415
... tend to pro- duce other new and dominant species . Consequently the groups which are now large , and which generally include many domi- nant species , tend to go on increasing in size . I further at- tempted to show that from the ...
... tend to pro- duce other new and dominant species . Consequently the groups which are now large , and which generally include many domi- nant species , tend to go on increasing in size . I further at- tempted to show that from the ...
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