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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19 페이지
... period of life the causes of variability , whatever they may be , generally act ; whether during the early or late period of development of the embryo , or at the instant of conception . Geoffroy St. Hilaire's experiments show that ...
... period of life the causes of variability , whatever they may be , generally act ; whether during the early or late period of development of the embryo , or at the instant of conception . Geoffroy St. Hilaire's experiments show that ...
24 페이지
... period of life a peculiarity first appears , it tends to appear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be otherwise : thus the inherited peculiarities in the horns of cattle ...
... period of life a peculiarity first appears , it tends to appear in the offspring at a corresponding age , though sometimes earlier . In many cases this could not be otherwise : thus the inherited peculiarities in the horns of cattle ...
28 페이지
... period 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 ...
... period 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 ...
40 페이지
... periods of English history choice animals were often imported , and laws were passed to prevent their exportation : the ... period attended to . Savages now sometimes cross their dogs with wild canine animals , to improve the breed , and ...
... periods of English history choice animals were often imported , and laws were passed to prevent their exportation : the ... period attended to . Savages now sometimes cross their dogs with wild canine animals , to improve the breed , and ...
67 페이지
... period of life . Our familiarity with the larger domestic animals tends , I think , to mislead us : we see no great ... period of life ; ife ; ] 1 and this period in the great majority of cases HIGH RATE OF INCREASE 67.
... period of life . Our familiarity with the larger domestic animals tends , I think , to mislead us : we see no great ... period of life ; ife ; ] 1 and this period in the great majority of cases HIGH RATE OF INCREASE 67.
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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