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 335
... seeds could resist the injurious action of sea - water . To my surprise I found that out of 87 kinds , 64 germinated after an immersion of 28 days , and a few survived an immersion of 137 days . It deserves notice that certain orders ...
... seeds could resist the injurious action of sea - water . To my surprise I found that out of 87 kinds , 64 germinated after an immersion of 28 days , and a few survived an immersion of 137 days . It deserves notice that certain orders ...
Página 336
... seeds in a box in the actual sea , so that they were alternately wet and exposed to the air like really floating plants . He tried 98 seeds , mostly different from mine ; but he chose many large fruits and likewise seeds from plants ...
... seeds in a box in the actual sea , so that they were alternately wet and exposed to the air like really floating plants . He tried 98 seeds , mostly different from mine ; but he chose many large fruits and likewise seeds from plants ...
Página 340
... seeds for very great distances : for seeds do not retain their vitality when exposed for a great length of time to the action of sea - water ; nor could they be long carried in the crops or intestines of birds . These means , however ...
... seeds for very great distances : for seeds do not retain their vitality when exposed for a great length of time to the action of sea - water ; nor could they be long carried in the crops or intestines of birds . These means , however ...
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