The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432ÆäÀÌÁö |
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xiv ÆäÀÌÁö
... forms in certain groups , and by the analogy of domestic productions . With respect to the means of modification , he attributed something to the direct action of the physical condi- tions of life , something to the crossing of already ...
... forms in certain groups , and by the analogy of domestic productions . With respect to the means of modification , he attributed something to the direct action of the physical condi- tions of life , something to the crossing of already ...
xx ÆäÀÌÁö
... forms . In this same year , 1853 , Dr. Schaaffhausen published an excel- lent pamphlet ( ' Verhand . des Naturhist . Vereins der Preuss . Rheinlands , ' & c . ) , in which he maintains the development of organic forms on the earth . He ...
... forms . In this same year , 1853 , Dr. Schaaffhausen published an excel- lent pamphlet ( ' Verhand . des Naturhist . Vereins der Preuss . Rheinlands , ' & c . ) , in which he maintains the development of organic forms on the earth . He ...
31 ÆäÀÌÁö
... form would be called a variety . It may be doubted whether sudden and considerable deviations of structure such as we ... forms of this kind ever do appear in a state of nature and are capable of reproduction ( which is not always the ...
... form would be called a variety . It may be doubted whether sudden and considerable deviations of structure such as we ... forms of this kind ever do appear in a state of nature and are capable of reproduction ( which is not always the ...
33 ÆäÀÌÁö
... forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans thus , the male of a Tanais regularly occurs under two distinct forms ...
... forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans thus , the male of a Tanais regularly occurs under two distinct forms ...
34 ÆäÀÌÁö
... form as a variety of another , even when they are closely connected by intermediate links ; nor will the commonly - assumed hybrid nature of the intermediate forms always remove the difficulty . In very many cases , however , one form ...
... form as a variety of another , even when they are closely connected by intermediate links ; nor will the commonly - assumed hybrid nature of the intermediate forms always remove the difficulty . In very many cases , however , one form ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely fact favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamell©¡ larv©¡ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young