On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430ÆäÀÌÁö |
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15 ÆäÀÌÁö
... observations it seemed to me probable that a careful study of domes- ticated animals and of cultivated plants would offer the best chance of making out this obscure problem . Nor have I been disappointed ; in this and in all other ...
... observations it seemed to me probable that a careful study of domes- ticated animals and of cultivated plants would offer the best chance of making out this obscure problem . Nor have I been disappointed ; in this and in all other ...
33 ÆäÀÌÁö
... observed : -I crossed some white fantails , which breed very true , with some black barbs - and it so happens that blue varieties of barbs are so rare that I never heard of an instance in England ; and the mongrels were black , brown ...
... observed : -I crossed some white fantails , which breed very true , with some black barbs - and it so happens that blue varieties of barbs are so rare that I never heard of an instance in England ; and the mongrels were black , brown ...
34 ÆäÀÌÁö
... observations , purposely made , on the most distinct breeds . Now , it is difficult , perhaps impossible , to bring forward one case of the hybrid offspring of two animals clearly distinct being them- selves perfectly fertile . Some ...
... observations , purposely made , on the most distinct breeds . Now , it is difficult , perhaps impossible , to bring forward one case of the hybrid offspring of two animals clearly distinct being them- selves perfectly fertile . Some ...
39 ÆäÀÌÁö
... observing the accumulated effects of selection - namely , by com- paring the diversity of flowers in the different varieties of the same species in the flower - garden ; the diversity of leaves , pods , or tubers , or whatever part is ...
... observing the accumulated effects of selection - namely , by com- paring the diversity of flowers in the different varieties of the same species in the flower - garden ; the diversity of leaves , pods , or tubers , or whatever part is ...
50 ÆäÀÌÁö
... observed in allied forms . If such have occurred , their perpetuation will have been due to their beneficial nature , so that natural selection will have come into play . Many cases are known of plants which regularly produce on ...
... observed in allied forms . If such have occurred , their perpetuation will have been due to their beneficial nature , so that natural selection will have come into play . Many cases are known of plants which regularly produce on ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larv©¡ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely