On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430 páginas |
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Página 10
... successive appearance of new species - On their different rates of change - Species once lost do not reappear- Groups of species follow the same general rules in their appear- ance and disappearance as do single species - On Extinction ...
... successive appearance of new species - On their different rates of change - Species once lost do not reappear- Groups of species follow the same general rules in their appear- ance and disappearance as do single species - On Extinction ...
Página 15
... successive slight variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long ...
... successive slight variations . I will then pass on to the variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long ...
Página 37
... successive generations . May not those naturalists who , knowing far less of the laws of inheritance than does the breeder , and knowing no more than he does of the intermediate links in the long lines of descent , yet admit that many ...
... successive generations . May not those naturalists who , knowing far less of the laws of inheritance than does the breeder , and knowing no more than he does of the intermediate links in the long lines of descent , yet admit that many ...
Página 38
... successive varia- tions ; man adds them up in certain directions useful to him . In this sense he may be said to make for himself useful breeds . ] Man cont calling his enviornment The great power of this principle of selection is not ...
... successive varia- tions ; man adds them up in certain directions useful to him . In this sense he may be said to make for himself useful breeds . ] Man cont calling his enviornment The great power of this principle of selection is not ...
Página 39
... successive gener- ations , of differences absolutely inappreciable by an uneducated eye - differences which I for one have vainly attempted to appreciate . Not one man in a thousand has accuracy of eye and judgment sufficient to become ...
... successive gener- ations , of differences absolutely inappreciable by an uneducated eye - differences which I for one have vainly attempted to appreciate . Not one man in a thousand has accuracy of eye and judgment sufficient to become ...
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Términos y frases comunes
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