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 99
... present lowly condition . And geology tells us that some of the lowest forms , as the infusoria and rhizopods , have remained for an enormous period in nearly their present state . But to suppose that most of the many now existing low ...
... present lowly condition . And geology tells us that some of the lowest forms , as the infusoria and rhizopods , have remained for an enormous period in nearly their present state . But to suppose that most of the many now existing low ...
Página 343
... present Alpine plants and animals of the several great European mountain - ranges one with another , though many of the species remain identically the same , some exist as varieties , some as doubtful forms or sub - species , and some ...
... present Alpine plants and animals of the several great European mountain - ranges one with another , though many of the species remain identically the same , some exist as varieties , some as doubtful forms or sub - species , and some ...
Página 441
... present ; but they will not be incessantly haunted by the shadowy doubt whether this or that form be a true species . This , I feel sure and I speak after experience , will be no slight relief . The endless disputes whether or not some ...
... present ; but they will not be incessantly haunted by the shadowy doubt whether this or that form be a true species . This , I feel sure and I speak after experience , will be no slight relief . The endless disputes whether or not some ...
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