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 8
... believe in this ; but the chief one is the remarkable effect which confine- ment or cultivation has on the function of the repro- ductive system ; this system appearing to be far more susceptible than any other part of the organisation ...
... believe in this ; but the chief one is the remarkable effect which confine- ment or cultivation has on the function of the repro- ductive system ; this system appearing to be far more susceptible than any other part of the organisation ...
Página 11
... believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats with blue eyes are invariably deaf ; colour and constitutional peculiarities go together , of ...
... believe that long limbs are almost always accompanied by an elongated head . Some instances of correlation are quite whimsical : thus cats with blue eyes are invariably deaf ; colour and constitutional peculiarities go together , of ...
Página 13
... believe that the rule has a wider extension , and that when there is no apparent reason why a peculiarity should appear at any particular age , yet that it does tend to appear in the offspring at the same period at which it first ...
... believe that the rule has a wider extension , and that when there is no apparent reason why a peculiarity should appear at any particular age , yet that it does tend to appear in the offspring at the same period at which it first ...
Página 16
... believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog has been produced under domestica- tion ; I believe that some small part of the difference is due to their being descended ...
... believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog has been produced under domestica- tion ; I believe that some small part of the difference is due to their being descended ...
Página 17
... believe that these latter have had more than one wild parent . With respect to horses , from reasons which I cannot give here , I am doubtfully inclined to believe , in opposition to several authors , that all the races have descended ...
... believe that these latter have had more than one wild parent . With respect to horses , from reasons which I cannot give here , I am doubtfully inclined to believe , in opposition to several authors , that all the races have descended ...
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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