On the Origin of Species by Means of Natural Selection: Or The Preservation of Favoured Races in the Struggle for LifeHumphrey Milford, Oxford University Press, 1923 - 454 páginas |
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... theory of Natural Selection . The great treatise in which that theory was promulgated , however , ' The Origin of Species ' - did not appear till 1859 , when Darwin was over fifty . It completely revolutionized the sciences of Botany ...
... theory of Natural Selection . The great treatise in which that theory was promulgated , however , ' The Origin of Species ' - did not appear till 1859 , when Darwin was over fifty . It completely revolutionized the sciences of Botany ...
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... THEORY 154 7. INSTINCT 186 8. HYBRIDISM 220 9. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD 250 10. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS 280 11. GEOGRAPHICAL DISTRIBUTION 12. GEOGRAPHICAL DISTRIBUTION - Continued 13. MUTUAL ...
... THEORY 154 7. INSTINCT 186 8. HYBRIDISM 220 9. ON THE IMPERFECTION OF THE GEOLOGICAL RECORD 250 10. ON THE GEOLOGICAL SUCCESSION OF ORGANIC BEINGS 280 11. GEOGRAPHICAL DISTRIBUTION 12. GEOGRAPHICAL DISTRIBUTION - Continued 13. MUTUAL ...
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... theory will be given namely , first , the difficulties of transi- tions , or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately constructed organ ; secondly ...
... theory will be given namely , first , the difficulties of transi- tions , or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately constructed organ ; secondly ...
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... theory ; inasmuch as geology plainly tells us that small genera have in the lapse of time often increased greatly in size ; and that large genera have often come to their maxima , declined , and disappeared . All that we want to show is ...
... theory ; inasmuch as geology plainly tells us that small genera have in the lapse of time often increased greatly in size ; and that large genera have often come to their maxima , declined , and disappeared . All that we want to show is ...
Página 101
... theory , and explains , as I believe , several important facts . In the first place , varieties , even strongly- marked ones , though having somewhat of the character of species — as is shown by the hopeless doubts in many cases how to ...
... theory , and explains , as I believe , several important facts . In the first place , varieties , even strongly- marked ones , though having somewhat of the character of species — as is shown by the hopeless doubts in many cases how to ...
Otras ediciones - Ver todas
On the Origin of Species by Means of Natural Selection: or the Preservation ... Charles Darwin Vista previa limitada - 2023 |
Términos y frases comunes
accumulated adapted affinities allied species America amount analogous ancient appear Archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence doubt embryo endemic Europe existing exterminated extinct extremely facts favourable fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons pistil plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive suppose swimbladder tend theory tion trees variability variation vary whole widely