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 277
... means : Mr. Croll gives the following illustration : take a narrow strip of paper , 83 feet 4 inches in length , and stretch it along the wall of a large hall ; then mark off at one end the tenth of an inch . This tenth of an inch will ...
... means : Mr. Croll gives the following illustration : take a narrow strip of paper , 83 feet 4 inches in length , and stretch it along the wall of a large hall ; then mark off at one end the tenth of an inch . This tenth of an inch will ...
Página 333
... mean : our English race - horses differ from the horses of every other breed ; but they do not owe their difference and ... Means of dispersal give here only the briefest abstract of the more important facts . Change of climate must have ...
... mean : our English race - horses differ from the horses of every other breed ; but they do not owe their difference and ... Means of dispersal give here only the briefest abstract of the more important facts . Change of climate must have ...
Página 373
... means of occasional transport , I have discussed at some little length the means of dispersal of fresh - water productions . If the difficulties be not insuperable in admitting that in the long course of time all the individuals of the ...
... means of occasional transport , I have discussed at some little length the means of dispersal of fresh - water productions . If the difficulties be not insuperable in admitting that in the long course of time all the individuals of the ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
Derechos de autor | |
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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