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 113
... suppose the amount of change represented by each successive group of diverging dotted lines to be very great , the forms marked a 14 to p14 , those marked b 14 and 14 , and those marked o m14 , will form three very distinct genera ...
... suppose the amount of change represented by each successive group of diverging dotted lines to be very great , the forms marked a 14 to p14 , those marked b 14 and 14 , and those marked o m14 , will form three very distinct genera ...
Página 125
... 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 European animals into the caves of ...
... 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 European animals into the caves of ...
Página 167
... suppose that the eye , with all its inimitable contriv- ances for adjusting the focus to different distances , for admitting different amounts of light , and for the correction of spherical and chromatic aberration , could have been ...
... suppose that the eye , with all its inimitable contriv- ances for adjusting the focus to different distances , for admitting different amounts of light , and for the correction of spherical and chromatic aberration , could have been ...
Página 170
... suppose each new state of the instrument to be multiplied by the million ; and each to be preserved till a better be produced , and then the old ones to be destroyed . In living bodies , variation will cause the slight alterations ...
... suppose each new state of the instrument to be multiplied by the million ; and each to be preserved till a better be produced , and then the old ones to be destroyed . In living bodies , variation will cause the slight alterations ...
Página 181
... suppose that at the same time this snake is furnished with a rattle for its own injury , namely , to warn its prey to escape . I would almost as soon believe that the cat curls the end of its tail when preparing to spring , in order to ...
... suppose that at the same time this snake is furnished with a rattle for its own injury , namely , to warn its prey to escape . I would almost as soon believe that the cat curls the end of its tail when preparing to spring , in order to ...
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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