On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430 páginas |
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Página 16
... Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and modification of every inhabitant of this world . Still less do we know of 16 INTRODUCTION CHAPTER I.
... Yet these relations are of the highest importance , for they determine the present welfare , and , as I believe , the future success and modification of every inhabitant of this world . Still less do we know of 16 INTRODUCTION CHAPTER I.
Página 22
... 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 generally 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 generally deaf . Colour and constitutional peculiarities go together , of ...
Página 24
... 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 27
... believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog has been produced under domestication ; I believe that some small part of the difference is due to their having descended ...
... believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog has been produced under domestication ; I believe that some small part of the difference is due to their having descended ...
Página 28
... believe that these latter have had more than one wild parent . With respect to horses , from reasons which I cannot here give , I am with much doubt inclined to believe , in opposition to several authors , that all the races have ...
... believe that these latter have had more than one wild parent . With respect to horses , from reasons which I cannot here give , I am with much doubt inclined to believe , in opposition to several authors , that all the races have ...
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Términos y frases comunes
accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely