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 |
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Página 40
... action of Selection , whether applied methodically and more quickly , or unconsciously and more slowly , but more efficiently , is by far the pre- dominant Power . CHAPTER II VARIATION UNDER NATURE Variability - Individual differences ...
... action of Selection , whether applied methodically and more quickly , or unconsciously and more slowly , but more efficiently , is by far the pre- dominant Power . CHAPTER II VARIATION UNDER NATURE Variability - Individual differences ...
Página 48
... action of different physical conditions in two different regions ; but I have not much faith in this view ; and I attribute the passage of a variety , from a state in which it differs very slightly from its parent to one in which it ...
... action of different physical conditions in two different regions ; but I have not much faith in this view ; and I attribute the passage of a variety , from a state in which it differs very slightly from its parent to one in which it ...
Página 51
... the same genus have been formed , or where , if we may use the expression , the manufactory of species has been active , we ought generally to find the manufactory still in action , more especially as we VARIATION UNDER NATURE 51.
... the same genus have been formed , or where , if we may use the expression , the manufactory of species has been active , we ought generally to find the manufactory still in action , more especially as we VARIATION UNDER NATURE 51.
Página 52
... action , more especially as we have every reason to believe the process of manufactur-し ing new species to be a slow one . And this certainly is the case , if varieties be looked at as incipient species ; for my tables clearly show as ...
... action , more especially as we have every reason to believe the process of manufactur-し ing new species to be a slow one . And this certainly is the case , if varieties be looked at as incipient species ; for my tables clearly show as ...
Página 57
... action , and is as immeasurably superior to man's feeble efforts , as the works of Nature are to those of Art . We will now discuss in a little more detail the struggle for existence . In my future work this subject shall be treated ...
... action , and is as immeasurably superior to man's feeble efforts , as the works of Nature are to those of Art . We will now discuss in a little more detail the struggle for existence . In my future work this subject shall be treated ...
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