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
... 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 Selection almost in- evitably causes much Extinction of ...
... 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 Selection almost in- evitably causes much Extinction of ...
Página 12
... tends to depart in some small degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of ...
... tends to depart in some small degree from that of the parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable deviations of structure , both those of slight and those of ...
Página 13
... tends to appear in the offspring at a corresponding age , though sometimes earlier . many cases this could not be ... tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this . rule ...
... tends to appear in the offspring at a corresponding age , though sometimes earlier . many cases this could not be ... tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this . rule ...
Página 24
... closely related together , though it is unsupported by a single experiment . But to ex- tend the hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , 24 ON THE ORIGIN OF SPECIES.
... closely related together , though it is unsupported by a single experiment . But to ex- tend the hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , 24 ON THE ORIGIN OF SPECIES.
Página 37
... tend , perhaps more at one period than at another , as the breed rises or falls in fashion , -perhaps more in one district than in another , according to the state of civilisation of the inhabitants - slowly to add to the characteristic ...
... tend , perhaps more at one period than at another , as the breed rises or falls in fashion , -perhaps more in one district than in another , according to the state of civilisation of the inhabitants - slowly to add to the characteristic ...
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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