The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, Volumen1D. Appleton, 1898 |
Dentro del libro
Resultados 6-10 de 25
Página 98
... successive generations ? If such do occur , can we doubt ( remembering that many more individuals are borne than can possibly survive ) that individuals having any advantage , however slight , over others , would have the best chance of ...
... successive generations ? If such do occur , can we doubt ( remembering that many more individuals are borne than can possibly survive ) that individuals having any advantage , however slight , over others , would have the best chance of ...
Página 109
... successive males display with the most elaborate care , and show off in the best manner , their gorgeous plumage ; they likewise perform strange antics before the females , which , standing by as spec- tators , at last choose the most ...
... successive males display with the most elaborate care , and show off in the best manner , their gorgeous plumage ; they likewise perform strange antics before the females , which , standing by as spec- tators , at last choose the most ...
Página 135
... successive generations . In practice , a fan- cier is , for instance , struck by a pigeon having a slightly shorter beak ; another fancier is struck by a pigeon hav- ing a rather longer beak ; and on the acknowledged principle that ...
... successive generations . In practice , a fan- cier is , for instance , struck by a pigeon having a slightly shorter beak ; another fancier is struck by a pigeon hav- ing a rather longer beak ; and on the acknowledged principle that ...
Página 143
... successive forms which have become suffi- ciently distinct to be recorded as varieties . But these breaks are imaginary , and might have been inserted any- where , after intervals long enough to allow the accumu- lation of a ...
... successive forms which have become suffi- ciently distinct to be recorded as varieties . But these breaks are imaginary , and might have been inserted any- where , after intervals long enough to allow the accumu- lation of a ...
Página 149
... successive strata of the earth's crust including extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities ...
... successive strata of the earth's crust including extinct remains . We shall , when we come to our chapter on Geology , have to refer again to this subject , and I think we shall then see that the diagram throws light on the affinities ...
Otras ediciones - Ver todas
Términos y frases comunes
adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young