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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20 페이지
... hand , we see domesticated animals and plants , though often weak and sickly , yet breeding quite freely under con- finement ; and when , on the other hand , we see individuals , though taken young from a state of nature , perfectly ...
... hand , we see domesticated animals and plants , though often weak and sickly , yet breeding quite freely under con- finement ; and when , on the other hand , we see individuals , though taken young from a state of nature , perfectly ...
46 페이지
... hand , nurserymen , from raising large stocks of the same plants , are generally far more successful than amateurs in getting new and valuable varieties . The keeping of a large number of individuals of a species in any country requires ...
... hand , nurserymen , from raising large stocks of the same plants , are generally far more successful than amateurs in getting new and valuable varieties . The keeping of a large number of individuals of a species in any country requires ...
47 페이지
... hand , cats , from their nocturnal rambling habits , cannot be easily matched , and , although so much valued by women and children , we hardly ever see a distinct breed kept up ; such breeds as we do sometimes see are almost always ...
... hand , cats , from their nocturnal rambling habits , cannot be easily matched , and , although so much valued by women and children , we hardly ever see a distinct breed kept up ; such breeds as we do sometimes see are almost always ...
54 페이지
... hand , they are united by many intermediate links , and it is very doubtful whether these links are hybrids ; and there is a large amount of experimental evidence , showing that they descend from common parents , and consequently must ...
... hand , they are united by many intermediate links , and it is very doubtful whether these links are hybrids ; and there is a large amount of experimental evidence , showing that they descend from common parents , and consequently must ...
59 페이지
... hand , if we look at each species as a special act of creation , there is no apparent reason why more varieties should occur in a group having many species than in one having few . To test the truth of this anticipation I have arranged ...
... hand , if we look at each species as a special act of creation , there is no apparent reason why more varieties should occur in a group having many species than in one having few . To test the truth of this anticipation I have arranged ...
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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