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 4
... principle of inheritance , any selected variety will tend to propagate its new and modified form . This fundamental subject of Natural Selection , will be treated at some length in the fourth chapter and we shall then see how Natural ...
... principle of inheritance , any selected variety will tend to propagate its new and modified form . This fundamental subject of Natural Selection , will be treated at some length in the fourth chapter and we shall then see how Natural ...
Página 7
... Principle of Selection anciently followed , its Effects - Methodical and Unconscious Selection - Unknown Origin of our Domestic Productions - Circumstances favourable to Man's power of Selection . WHEN we look to the individuals of the ...
... Principle of Selection anciently followed , its Effects - Methodical and Unconscious Selection - Unknown Origin of our Domestic Productions - Circumstances favourable to Man's power of Selection . WHEN we look to the individuals of the ...
Página 12
... principle by theoretical writers alone . When any deviation of structure often appears , and we see it in the father and child , we cannot tell whether it may not be due to the same cause having acted on both ; but when amongst ...
... principle by theoretical writers alone . When any deviation of structure often appears , and we see it in the father and child , we cannot tell whether it may not be due to the same cause having acted on both ; but when amongst ...
Página 23
... bar , and barred and white - edged tail - feathers , as any wild rock - pigeon ! We can understand these facts , on the well - known principle of reversion to ancestral characters , if all the domestic VARIATION UNDER DOMESTICATION 23.
... bar , and barred and white - edged tail - feathers , as any wild rock - pigeon ! We can understand these facts , on the well - known principle of reversion to ancestral characters , if all the domestic VARIATION UNDER DOMESTICATION 23.
Página 28
... principle of selection is not hypothetical . It is certain that several of our eminent breeders have , even within a single lifetime , modified to a large extent some breeds of cattle and sheep . order fully to realise what they have ...
... principle of selection is not hypothetical . It is certain that several of our eminent breeders have , even within a single lifetime , modified to a large extent some breeds of cattle and sheep . order fully to realise what they have ...
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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