On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1888 - 458페이지 |
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xiv 페이지
... forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already ...
... forms in certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already ...
xx 페이지
... forms . In this same year , 1853 , Dr. Schaaffhausen published an ex- cellent pamphlet ( Verhand . des Naturhist . Vereins der Preuss . Rheinlands , ' & c . ) , in which he maintains the progressive develop- ment of organic forms on the ...
... forms . In this same year , 1853 , Dr. Schaaffhausen published an ex- cellent pamphlet ( Verhand . des Naturhist . Vereins der Preuss . Rheinlands , ' & c . ) , in which he maintains the progressive develop- ment of organic forms on the ...
34 페이지
... forms of this kind ever do appear in a state of nature and are capable of reproduction ( which is not always the ... form , and thus their abnormal character would almost inevitably be lost . But I shall have to return in a future ...
... forms of this kind ever do appear in a state of nature and are capable of reproduction ( which is not always the ... form , and thus their abnormal character would almost inevitably be lost . But I shall have to return in a future ...
36 페이지
... forms ; one of these has strong and differently shaped pincers , and the other has antennæ much more abundantly furnished with smelling - hairs . Although in most of these cases , the two or three forms , both with animals and plants ...
... forms ; one of these has strong and differently shaped pincers , and the other has antennæ much more abundantly furnished with smelling - hairs . Although in most of these cases , the two or three forms , both with animals and plants ...
37 페이지
... forms always remove the difficulty . In very many cases , however , one form is ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that ...
... forms always remove the difficulty . In very many cases , however , one form is ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young