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 - 454페이지 |
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7 페이지
... parent - species have been exposed under nature . There is also , I think , some probability in the view propounded by Andrew Knight , that this variability may be partly connected with excess of food . It seems pretty clear that ...
... parent - species have been exposed under nature . There is also , I think , some probability in the view propounded by Andrew Knight , that this variability may be partly connected with excess of food . It seems pretty clear that ...
9 페이지
... parent has affected a bud or offset , and not the ovules or pollen . But it is the opinion of most physiologists that there is no essential difference between a bud and an ovule in their earliest stages of formation ; so that , in fact ...
... parent has affected a bud or offset , and not the ovules or pollen . But it is the opinion of most physiologists that there is no essential difference between a bud and an ovule in their earliest stages of formation ; so that , in fact ...
10 페이지
... parent prior to the act of conception . These cases anyhow show that variation is not necessarily connected , as some authors have sup- posed , with the act of generation . Seedlings from the same fruit , and the young of the same ...
... parent prior to the act of conception . These cases anyhow show that variation is not necessarily connected , as some authors have sup- posed , with the act of generation . Seedlings from the same fruit , and the young of the same ...
12 페이지
... parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable ... parent - say , once amongst several million individuals — and it reappears in the child , the mere doctrine of ...
... parental type . Any variation which is not inherited is unimportant for us . But the number and diversity of inheritable ... parent - say , once amongst several million individuals — and it reappears in the child , the mere doctrine of ...
13 페이지
... parent . I believe this . rule to be of the highest importance in explaining the laws of embryology . These remarks are of course confined to the first appearance of the peculiarity , and not to its primary cause , which may have acted ...
... parent . I believe this . rule to be of the highest importance in explaining the laws of embryology . These remarks are of course confined to the first appearance of the peculiarity , and not to its primary cause , which may have acted ...
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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