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 70
Página 297
... land , or as a submarine surface near land , on which sediment was not deposited , or as the bed of an open and unfathomable sea . Looking to the existing oceans , which are thrice as extensive as the land , we see them studded with ...
... land , or as a submarine surface near land , on which sediment was not deposited , or as the bed of an open and unfathomable sea . Looking to the existing oceans , which are thrice as extensive as the land , we see them studded with ...
Página 344
... land still nearer to the pole . Now , if we looked at a terrestrial globe , we see under the Polar Circle that there is almost continuous land from western Europe , through Siberia , to eastern America . And this continuity of the ...
... land still nearer to the pole . Now , if we looked at a terrestrial globe , we see under the Polar Circle that there is almost continuous land from western Europe , through Siberia , to eastern America . And this continuity of the ...
Página 366
... land - shells , when hibernating and having a mem- branous diaphragm over the mouth of the shell , might be floated in chinks of drifted timber across moderately wide arms of the sea . And I find that several species in this state ...
... land - shells , when hibernating and having a mem- branous diaphragm over the mouth of the shell , might be floated in chinks of drifted timber across moderately wide arms of the sea . And I find that several species in this state ...
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