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 122
... America can only flap along the surface of the water , and has its wings in nearly the same condition as the domestic Aylesbury duck . As the larger ground - feeding birds seldom take flight except to escape danger , I believe that the ...
... America can only flap along the surface of the water , and has its wings in nearly the same condition as the domestic Aylesbury duck . As the larger ground - feeding birds seldom take flight except to escape danger , I believe that the ...
Página 124
... America , a burrowing rodent , the tuco - tuco , or Ctenomys , is even more subterranean in its habits than the mole ; and I was assured by a Spaniard , who had often caught them , that they were frequently blind ; one which I kept ...
... America , a burrowing rodent , the tuco - tuco , or Ctenomys , is even more subterranean in its habits than the mole ; and I was assured by a Spaniard , who had often caught them , that they were frequently blind ; one which I kept ...
Página 125
... America and Europe . On my view we must suppose that American animals , having ordinary powers of vision , slowly migrated by successive generations from the outer world into the deeper and deeper recesses of the Kentucky caves , as did ...
... America and Europe . On my view we must suppose that American animals , having ordinary powers of vision , slowly migrated by successive generations from the outer world into the deeper and deeper recesses of the Kentucky caves , as did ...
Página 126
... America , affinities to the other inhabitants of that continent , and in those of Europe , to the inhabitants of the European continent . And this is the case with some of the American cave - animals , as I hear from Professor Dana ...
... America , affinities to the other inhabitants of that continent , and in those of Europe , to the inhabitants of the European continent . And this is the case with some of the American cave - animals , as I hear from Professor Dana ...
Página 161
... by a struggle for life , it is clear that each is well adapted in its habits to its place in nature . Look at the Mustela vison of North America , which has M webbed feet and which resembles an otter in its fur DIFFICULTIES ON THEORY 161.
... by a struggle for life , it is clear that each is well adapted in its habits to its place in nature . Look at the Mustela vison of North America , which has M webbed feet and which resembles an otter in its fur DIFFICULTIES ON THEORY 161.
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