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
... organisation . Nearly the same remarks are applicable if we look to the different grades of organisation within the same great group ; for instance , in the vertebrata , to the co - existence of mammals and fish - amongst mammalia , to ...
... organisation . Nearly the same remarks are applicable if we look to the different grades of organisation within the same great group ; for instance , in the vertebrata , to the co - existence of mammals and fish - amongst mammalia , to ...
Página 318
... organisation since even the Laurentian epoch ; for some organisms would have to remain fitted for simple conditions of life , and what could be better fitted for this end than these lowly organised Protozoa ? Such objections as the ...
... organisation since even the Laurentian epoch ; for some organisms would have to remain fitted for simple conditions of life , and what could be better fitted for this end than these lowly organised Protozoa ? Such objections as the ...
Página 319
... organisation , we ought not solely to compare the highest members of a class at any two periods - though undoubtedly this is one and perhaps the most important element in striking a balance— but we ought to compare all the members ...
... organisation , we ought not solely to compare the highest members of a class at any two periods - though undoubtedly this is one and perhaps the most important element in striking a balance— but we ought to compare all the members ...
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