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
... whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring struggle for existence , it follows that any being , if it vary ...
... whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , consequently , there is a frequently recurring struggle for existence , it follows that any being , if it vary ...
Página 12
... whole organisation seems to have become plastic , and 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 ...
... whole organisation seems to have become plastic , and 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 ...
Página 16
... 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 from distinct species . In the case of some ...
... 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 from distinct species . In the case of some ...
Página 17
... whole subject must , I think , remain vague ; nevertheless , I may , without here entering on any details , state that , from geographical and other con- siderations , I think it highly probable that our domestic dogs have descended ...
... whole subject must , I think , remain vague ; nevertheless , I may , without here entering on any details , state that , from geographical and other con- siderations , I think it highly probable that our domestic dogs have descended ...
Página 23
... whole great family of Columbidæ for a beak like that of the English carrier , or that of the short - faced tumbler , or barb ; for reversed feathers like those of the Jacobin ; for a crop like that of the pouter ; for tail - feathers ...
... whole great family of Columbidæ for a beak like that of the English carrier , or that of the short - faced tumbler , or barb ; for reversed feathers like those of the Jacobin ; for a crop like that of the pouter ; for tail - feathers ...
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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