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 |
Dentro del libro
Resultados 1-3 de 77
Página 297
... formations of Europe and of the United States ; and from the amount of sediment , miles in thickness , of which the formations are composed , we may infer that from first to last large islands or tracts of land , whence the sediment was ...
... formations of Europe and of the United States ; and from the amount of sediment , miles in thickness , of which the formations are composed , we may infer that from first to last large islands or tracts of land , whence the sediment was ...
Página 298
... formations long anterior to the Cambrian epoch in a completely metamorphosed and denuded condition . The several difficulties here discussed , namely that , though we find in our geological formations many links between the species ...
... formations long anterior to the Cambrian epoch in a completely metamorphosed and denuded condition . The several difficulties here discussed , namely that , though we find in our geological formations many links between the species ...
Página 316
... formations are far more closely related to each other , than are the fossils from two remote formations . Pictet gives as a well - known instance , the general resemblance of the organic remains from the several stages of the Chalk ...
... formations are far more closely related to each other , than are the fossils from two remote formations . Pictet gives as a well - known instance , the general resemblance of the organic remains from the several stages of the Chalk ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
Derechos de autor | |
Otras 13 secciones no mostradas
Otras ediciones - Ver todas
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