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 43
... natural selection , as hereafter will be explained . Those forms which possess in some considerable degree the character of species , but which are so closely similar to some other forms , or are so closely linked to them by ...
... natural selection , as hereafter will be explained . Those forms which possess in some considerable degree the character of species , but which are so closely similar to some other forms , or are so closely linked to them by ...
Página 55
... also tend to break up into smaller genera . And thus , the forms of life throughout the universe become divided into groups subordinate to groups . CHAPTER III STRUGGLE FOR EXISTENCE Bears on natural selection - VARIATION UNDER NATURE 55.
... also tend to break up into smaller genera . And thus , the forms of life throughout the universe become divided into groups subordinate to groups . CHAPTER III STRUGGLE FOR EXISTENCE Bears on natural selection - VARIATION UNDER NATURE 55.
Página 56
... Natural Selection . has been seen in the last chapter that amongst organic beings in a state of nature there is some individual vari- ability indeed I am not aware that this has ever been disputed . It is immaterial for us whether a ...
... Natural Selection . has been seen in the last chapter that amongst organic beings in a state of nature there is some individual vari- ability indeed I am not aware that this has ever been disputed . It is immaterial for us whether a ...
Página 57
... Natural Selection , in order to mark its relation to man's power of selection . We have seen that man by selection can certainly produce great results , and can adapt organic beings to his own uses , through the accumulation of slight ...
... Natural Selection , in order to mark its relation to man's power of selection . We have seen that man by selection can certainly produce great results , and can adapt organic beings to his own uses , through the accumulation of slight ...
Página 72
... that no fear is felt , that death is generally prompt , and that the vigorous , the healthy , and the happy survive and multiply . CHAPTER IV NATURAL SELECTION Natural Selection - its power compared 72 ON THE ORIGIN OF SPECIES.
... that no fear is felt , that death is generally prompt , and that the vigorous , the healthy , and the happy survive and multiply . CHAPTER IV NATURAL SELECTION Natural Selection - its power compared 72 ON THE ORIGIN OF SPECIES.
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
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