On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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21 페이지
... extremely rare under nature , but far from rare under cultivation ; and in this case we see that the treatment of the parent has affected a bud or offset , and not the ovules or pollen . But it is the opinion of most physiologists that ...
... extremely rare under nature , but far from rare under cultivation ; and in this case we see that the treatment of the parent has affected a bud or offset , and not the ovules or pollen . But it is the opinion of most physiologists that ...
22 페이지
... extremely valuable . When all or nearly all the individuals exposed to certain , conditions are affected in the same way , the change at first appears to be directly due to such conditions ; but in some cases it can be shown that quite ...
... extremely valuable . When all or nearly all the individuals exposed to certain , conditions are affected in the same way , the change at first appears to be directly due to such conditions ; but in some cases it can be shown that quite ...
28 페이지
... extremely remote as measured by years ; and we know that at the present day there is hardly a tribe so barbarous as not to have domesticated at least the dog . The origin of most of our domestic animals will probably for ever remain ...
... extremely remote as measured by years ; and we know that at the present day there is hardly a tribe so barbarous as not to have domesticated at least the dog . The origin of most of our domestic animals will probably for ever remain ...
29 페이지
... extremely different races or species , I can hardly believe . Sir J. Sebright expressly experimented for this object , and failed . The offspring from the first cross between two pure breeds is tolerably and sometimes ( as I have found ...
... extremely different races or species , I can hardly believe . Sir J. Sebright expressly experimented for this object , and failed . The offspring from the first cross between two pure breeds is tolerably and sometimes ( as I have found ...
40 페이지
... extremely alike the flowers ; how unlike the flowers of the heartsease are , and how alike the leaves ; how much the fruit of the different kinds of gooseberries differ in size , colour , shape , and hairiness , and yet the flowers ...
... extremely alike the flowers ; how unlike the flowers of the heartsease are , and how alike the leaves ; how much the fruit of the different kinds of gooseberries differ in size , colour , shape , and hairiness , and yet the flowers ...
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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 larvæ 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