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
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Página 28
... known to have been the case with the ancon sheep . But when we compare the dray - horse and race - horse , the dromedary and camel , the various breeds of sheep fitted either for cultivated land or mountain pasture , with the wool of ...
... known to have been the case with the ancon sheep . But when we compare the dray - horse and race - horse , the dromedary and camel , the various breeds of sheep fitted either for cultivated land or mountain pasture , with the wool of ...
Página 32
... known that the English pointer has been greatly changed within the last century , and in this case the change has , it is believed , been chiefly effected by crosses with the fox - hound ; but what concerns us is , that the change has ...
... known that the English pointer has been greatly changed within the last century , and in this case the change has , it is believed , been chiefly effected by crosses with the fox - hound ; but what concerns us is , that the change has ...
Página 34
... known variety , sowing its seeds , and , when a slightly better variety has chanced to appear , selecting it , and so onwards . But the gardeners of the classical period , who cultivated the best pear they could procure , never thought ...
... known variety , sowing its seeds , and , when a slightly better variety has chanced to appear , selecting it , and so onwards . But the gardeners of the classical period , who cultivated the best pear they could procure , never thought ...
Página 42
... known frequently to appear in the offspring from the same parents , or which may be presumed to have thus arisen , from being frequently observed in the indivi- duals of the same species inhabiting the same confined locality . No one ...
... known frequently to appear in the offspring from the same parents , or which may be presumed to have thus arisen , from being frequently observed in the indivi- duals of the same species inhabiting the same confined locality . No one ...
Página 44
... known varieties can be named which have not been ranked as species by at least some com- petent judges . That varieties of this doubtful nature are far from uncommon cannot be disputed . Compare the several floras of Great Britain , of ...
... known varieties can be named which have not been ranked as species by at least some com- petent judges . That varieties of this doubtful nature are far from uncommon cannot be disputed . Compare the several floras of Great Britain , of ...
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