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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23 페이지
... become plastic , and tends to depart in some small degree from that of the parental type . [ Any variation which is not inherited is unimporta for us . But the number and diversity of inheritable deviations of structure , both those of ...
... become plastic , and tends to depart in some small degree from that of the parental type . [ Any variation which is not inherited is unimporta for us . But the number and diversity of inheritable deviations of structure , both those of ...
32 페이지
... become wild or feral , though the dovecot - pigeon , which is the rock - pigeon in a very slightly altered state , has become feral in several places . Again , all recent experience shows that it is difficult to get any wild animal to ...
... become wild or feral , though the dovecot - pigeon , which is the rock - pigeon in a very slightly altered state , has become feral in several places . Again , all recent experience shows that it is difficult to get any wild animal to ...
33 페이지
... become extinct or un- known . So many strange contingencies are improbable in the highest degree . Byen varvation not due to domestication . Some facts in regard to the colouring of pigeons well deserve consideration . The rock - pigeon ...
... become extinct or un- known . So many strange contingencies are improbable in the highest degree . Byen varvation not due to domestication . Some facts in regard to the colouring of pigeons well deserve consideration . The rock - pigeon ...
34 페이지
... become less and less , as in each succeeding generation there will be less of the foreign blood ; but when there has been no cross with a distinct breed , and there is a tendency in both parents to revert to a character which has been ...
... become less and less , as in each succeeding generation there will be less of the foreign blood ; but when there has been no cross with a distinct breed , and there is a tendency in both parents to revert to a character which has been ...
39 페이지
... become an eminent breeder . If gifted with these qualities , and he studies his subject for years , and devotes his lifetime to it with indomitable perseverance , he will succeed , and may make great improvements ; if he wants any of ...
... become an eminent breeder . If gifted with these qualities , and he studies his subject for years , and devotes his lifetime to it with indomitable perseverance , he will succeed , and may make great improvements ; if he wants any of ...
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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