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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Página 12
... individuals — and it reappears in the child , the mere doctrine of chances almost compels us to attribute its ... individuals of the same species , or in individuals of different species , is sometimes inherited and sometimes not so ...
... individuals — and it reappears in the child , the mere doctrine of chances almost compels us to attribute its ... individuals of the same species , or in individuals of different species , is sometimes inherited and sometimes not so ...
Página 19
... individual mongrels , which present any desired character ; but that a race could be obtained nearly intermediate between two extremely different races or species , I can hardly believe . Sir J. Sebright ex- pressly experimentised for ...
... individual mongrels , which present any desired character ; but that a race could be obtained nearly intermediate between two extremely different races or species , I can hardly believe . Sir J. Sebright ex- pressly experimentised for ...
Página 28
... - petent authorities . Youatt , who was probably better acquainted with the works of agriculturists than almost any other individual , and who was himself a " very good judge of an animal , speaks of 28 ON THE ORIGIN OF SPECIES.
... - petent authorities . Youatt , who was probably better acquainted with the works of agriculturists than almost any other individual , and who was himself a " very good judge of an animal , speaks of 28 ON THE ORIGIN OF SPECIES.
Página 32
... individual animals , is more im- portant . Thus , a man who intends keeping pointers naturally tries to get as good ... individuals of the same breed may be found in less civilised dis- tricts , where the breed has been less improved ...
... individual animals , is more im- portant . Thus , a man who intends keeping pointers naturally tries to get as good ... individuals of the same breed may be found in less civilised dis- tricts , where the breed has been less improved ...
Página 35
... individuals of the same species , having slightly different constitutions or structure , would often succeed better in the one country than in the other ; and thus by a process of ' natural selection , ' as will hereafter be more fully ...
... individuals of the same species , having slightly different constitutions or structure , would often succeed better in the one country than in the other ; and thus by a process of ' natural selection , ' as will hereafter be more fully ...
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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