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 15
... origin of genera which I shall presently give , we have no right to expect often to meet with generic differences in our domesticated productions . It has often been differ from each I think it could When we attempt to estimate the ...
... origin of genera which I shall presently give , we have no right to expect often to meet with generic differences in our domesticated productions . It has often been differ from each I think it could When we attempt to estimate the ...
Página 22
... origin of our pigeons , it must be assumed that at least seven or eight species were so thoroughly domesticated in ancient times by half - civilised man , as to be quite prolific under confinement . An argument , as it seems to me , of ...
... origin of our pigeons , it must be assumed that at least seven or eight species were so thoroughly domesticated in ancient times by half - civilised man , as to be quite prolific under confinement . An argument , as it seems to me , of ...
Página 28
... highly com- petent authorities . Youatt , who was probably better acquainted with the works of agriculturists than almost any other individual , and who was himself a " very good judge of an animal , speaks of 28 ON THE ORIGIN OF SPECIES.
... highly com- petent authorities . Youatt , who was probably better acquainted with the works of agriculturists than almost any other individual , and who was himself a " very good judge of an animal , speaks of 28 ON THE ORIGIN OF SPECIES.
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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