On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 295
... Silurian stratum the first dawn of life . Other highly competent judges , as Lyell and E. Forbes , have disputed this conclusion . We should not forget that only a small portion of the world is known with accuracy . Not very long ago M ...
... Silurian stratum the first dawn of life . Other highly competent judges , as Lyell and E. Forbes , have disputed this conclusion . We should not forget that only a small portion of the world is known with accuracy . Not very long ago M ...
Página 300
... Silurian Lingula differs but little from the living species of this genus ; whereas most of the other Silurian Molluscs and all the Crustaceans have changed greatly . The productions of the land seem to have changed at a quicker rate ...
... Silurian Lingula differs but little from the living species of this genus ; whereas most of the other Silurian Molluscs and all the Crustaceans have changed greatly . The productions of the land seem to have changed at a quicker rate ...
Página 456
... SILURIAN SYSTEM .-- A very ancient system of fossiliferous rocks belonging to the earlier part of the Palæozoic series . SPECIALISATION . — The setting apart of a particular organ for the performance of a particular function . SPINAL ...
... SILURIAN SYSTEM .-- A very ancient system of fossiliferous rocks belonging to the earlier part of the Palæozoic series . SPECIALISATION . — The setting apart of a particular organ for the performance of a particular function . SPINAL ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young