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 22
... in several other cases , is , that the above- specified breeds , though agreeing generally in con- stitution , habits , voice , colouring , and in most parts of their structure , with the wild rock - pigeon , 66 ON THE ORIGIN OF SPECIES 22.
... in several other cases , is , that the above- specified breeds , though agreeing generally in con- stitution , habits , voice , colouring , and in most parts of their structure , with the wild rock - pigeon , 66 ON THE ORIGIN OF SPECIES 22.
Página 23
Or The Preservation of Favoured Races in the Struggle for Life Charles Darwin. their structure , with the wild rock - pigeon , yet are certainly highly abnormal in other parts of their structure ; we may look in vain throughout the whole ...
Or The Preservation of Favoured Races in the Struggle for Life Charles Darwin. their structure , with the wild rock - pigeon , yet are certainly highly abnormal in other parts of their structure ; we may look in vain throughout the whole ...
Página 25
... structure with all the domestic breeds . Secondly , although an English carrier or short - faced tumbler differs immensely in certain characters from the rock- pigeon , yet by comparing the several sub - breeds of these varieties , more ...
... structure with all the domestic breeds . Secondly , although an English carrier or short - faced tumbler differs immensely in certain characters from the rock- pigeon , yet by comparing the several sub - breeds of these varieties , more ...
Página 35
... structure , would often succeed better in the one country than in the other ; and thus by a process of ' natural selection , ' as will hereafter be more fully explained , two sub - breeds might be formed . This , perhaps , partly ...
... structure , would often succeed better in the one country than in the other ; and thus by a process of ' natural selection , ' as will hereafter be more fully explained , two sub - breeds might be formed . This , perhaps , partly ...
Página 43
... structure which are of no service or disservice to the species , and which con- sequently have not been seized on and rendered definite by natural selection , as hereafter will be explained . Those forms which possess in some ...
... structure which are of no service or disservice to the species , and which con- sequently have not been seized on and rendered definite by natural selection , as hereafter will be explained . Those forms which possess in some ...
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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