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 33
... considered as un- consciously followed , in so far that the breeders could never have expected or even have wished to have pro- duced the result which ensued - namely , the production of two distinct strains . The two flocks of ...
... considered as un- consciously followed , in so far that the breeders could never have expected or even have wished to have pro- duced the result which ensued - namely , the production of two distinct strains . The two flocks of ...
Página 44
... . Mr. H. C. Watson , to whom I lie under deep obligation for assistance of all kinds , has marked for me 182 British plants , which are generally considered as varieties , but which have all been ranked by 44 ON THE ORIGIN OF SPECIES.
... . Mr. H. C. Watson , to whom I lie under deep obligation for assistance of all kinds , has marked for me 182 British plants , which are generally considered as varieties , but which have all been ranked by 44 ON THE ORIGIN OF SPECIES.
Página 45
... that between the Continent and the Azores , or Madeira , or the Canaries , or Ireland , be sufficient ? It must be admitted that many forms , considered by highly - competent judges as varieties , have VARIATION UNDER NATURE 45.
... that between the Continent and the Azores , or Madeira , or the Canaries , or Ireland , be sufficient ? It must be admitted that many forms , considered by highly - competent judges as varieties , have VARIATION UNDER NATURE 45.
Página 46
Or The Preservation of Favoured Races in the Struggle for Life Charles Darwin. considered by highly - competent judges as varieties , have so perfectly the character of species that they are ranked by other highly - competent judges as ...
Or The Preservation of Favoured Races in the Struggle for Life Charles Darwin. considered by highly - competent judges as varieties , have so perfectly the character of species that they are ranked by other highly - competent judges as ...
Página 47
... considered as varieties ; and in this country the highest botanical authorities and practical men can be quoted to show that the sessile and pedunculated oaks are either good and distinct species or mere varieties . When a young ...
... considered as varieties ; and in this country the highest botanical authorities and practical men can be quoted to show that the sessile and pedunculated oaks are either good and distinct species or mere varieties . When a young ...
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