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 16
... common camel , prevented their domestication ? I cannot doubt that if other animals and plants , equal in number to our domesticated productions , and belonging to equally diverse classes and countries , were taken from a state of ...
... common camel , prevented their domestication ? I cannot doubt that if other animals and plants , equal in number to our domesticated productions , and belonging to equally diverse classes and countries , were taken from a state of ...
Página 17
... almost any one , thinks that all the breeds of poultry have proceeded from the common wild Indian fowl ( Gallus bankiva ) . In regard с to ducks and rabbits , the breeds of which differ VARIATION UNDER DOMESTICATION 17.
... almost any one , thinks that all the breeds of poultry have proceeded from the common wild Indian fowl ( Gallus bankiva ) . In regard с to ducks and rabbits , the breeds of which differ VARIATION UNDER DOMESTICATION 17.
Página 20
... common tumbler has the singular inherited habit of flying at a great height in a compact flock , and tumbling in the air head over heels . The runt is a bird of great size , with long , massive beak and large feet ; some of the sub ...
... common tumbler has the singular inherited habit of flying at a great height in a compact flock , and tumbling in the air head over heels . The runt is a bird of great size , with long , massive beak and large feet ; some of the sub ...
Página 21
... common opinion of naturalists is correct , namely , that all have de- scended from the rock - pigeon ( Columba livia ) , including under this term several geographical races or sub- species , which differ from each other in the most ...
... common opinion of naturalists is correct , namely , that all have de- scended from the rock - pigeon ( Columba livia ) , including under this term several geographical races or sub- species , which differ from each other in the most ...
Página 22
... common rock - pigeon , which has the same habits with the domestic breeds , has not been exter- minated even on several of the smaller British islets , or on the shores of the Mediterranean . Hence the supposed extermination of so many ...
... common rock - pigeon , which has the same habits with the domestic breeds , has not been exter- minated even on several of the smaller British islets , or on the shores of the Mediterranean . Hence the supposed extermination of so many ...
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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