On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
Dentro del libro
Página 3
... flowers with separate sexes absolutely requiring the agency of certain insects to bring pollen from one flower to the other , it is equally preposterous to account for the structure of this parasite , with its relations to several ...
... flowers with separate sexes absolutely requiring the agency of certain insects to bring pollen from one flower to the other , it is equally preposterous to account for the structure of this parasite , with its relations to several ...
Página 10
... flowering with plants when transported from one climate to another . In animals it has a more marked effect ; for instance , I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion ...
... flowering with plants when transported from one climate to another . In animals it has a more marked effect ; for instance , I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion ...
Página 28
... flower- garden races of plants , most useful to man at different seasons and for different purposes , or so beautiful in his eyes , we must , I think , look further than to mere variability . We cannot suppose that all the breeds were ...
... flower- garden races of plants , most useful to man at different seasons and for different purposes , or so beautiful in his eyes , we must , I think , look further than to mere variability . We cannot suppose that all the breeds were ...
Página 30
... flowers in the different varieties of the same species in the flower - garden ; the diversity of leaves , pods , or tubers , or whatever part is valued , in the kitchen - garden , in comparison with the flowers of the same varieties ...
... flowers in the different varieties of the same species in the flower - garden ; the diversity of leaves , pods , or tubers , or whatever part is valued , in the kitchen - garden , in comparison with the flowers of the same varieties ...
Página 31
... flowers , or the fruit , will produce races differing from each other chiefly in these characters . It may be objected that the principle of selection has been reduced to methodical practice for scarcely more than three - quarters of a ...
... flowers , or the fruit , will produce races differing from each other chiefly in these characters . It may be objected that the principle of selection has been reduced to methodical practice for scarcely more than three - quarters of a ...
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely