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
... supposed , with the act of generation . eavioramental factors " 6 Seedlings from the same fruit , and the young of the same litter , sometimes differ considerably from each other , though both the young and the parents , as Müller has ...
... supposed , with the act of generation . eavioramental factors " 6 Seedlings from the same fruit , and the young of the same litter , sometimes differ considerably from each other , though both the young and the parents , as Müller has ...
32 페이지
... supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees . But besides C. livia , with its geographical sub - species , only two or three other species of rock - pigeons are ...
... supposed aboriginal stocks must all have been rock - pigeons , that is , not breeding or willingly perching on trees . But besides C. livia , with its geographical sub - species , only two or three other species of rock - pigeons are ...
34 페이지
... hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should yield offspring perfectly fertile inter se , seems to me 34 VARIATION UNDER DOMESTICATION.
... hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should yield offspring perfectly fertile inter se , seems to me 34 VARIATION UNDER DOMESTICATION.
35 페이지
... supposed species of pigeons to breed freely under domestication ; these supposed species being quite unknown in a wild state , and their becoming nowhere feral ; these species having very abnormal characters in certain respects , as ...
... supposed species of pigeons to breed freely under domestication ; these supposed species being quite unknown in a wild state , and their becoming nowhere feral ; these species having very abnormal characters in certain respects , as ...
49 페이지
... supposed not to be inherited : but who can say that the dwarfed condition of shells in the brackish waters of the Baltic , or dwarfed plants on Alpine summits , or the thicker fur of an animal from far northwards , would not in some ...
... supposed not to be inherited : but who can say that the dwarfed condition of shells in the brackish waters of the Baltic , or dwarfed plants on Alpine summits , or the thicker fur of an animal from far northwards , would not in some ...
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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