The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356페이지 |
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4 페이지
... common parent - Explains the grouping of all organic beings - Advance in organization - Low forms preserved- Convergence of character - Indefinite multiplication of species - Sum · mary . 120 CHAPTER V LAWS OF VARIATION Effects of ...
... common parent - Explains the grouping of all organic beings - Advance in organization - Low forms preserved- Convergence of character - Indefinite multiplication of species - Sum · mary . 120 CHAPTER V LAWS OF VARIATION Effects of ...
33 페이지
... common result of changed conditions than definite variability , and has probably played a more important part in the formation of our domestic races . We see indefinite variability in the endless slight peculiarities which distinguish ...
... common result of changed conditions than definite variability , and has probably played a more important part in the formation of our domestic races . We see indefinite variability in the endless slight peculiarities which distinguish ...
43 페이지
... common camel , pre- vented their domestication ? I cannot doubt that if other animals and plants , equal in number to our domesticated productions , and belonging to equally diverse classes and countries , were taken from a state of ...
... common camel , pre- vented their domestication ? I cannot doubt that if other animals and plants , equal in number to our domesticated productions , and belonging to equally diverse classes and countries , were taken from a state of ...
45 페이지
... common cattle , may , indeed , be looked upon as established by the admirable researches of Pro- fessor Rütimeyer . With respect to horses , from reasons which I cannot here give , I am doubtfully inclined to believe , in opposition to ...
... common cattle , may , indeed , be looked upon as established by the admirable researches of Pro- fessor Rütimeyer . With respect to horses , from reasons which I cannot here give , I am doubtfully inclined to believe , in opposition to ...
48 페이지
... common tumbler has the singular inherited habit of flying at a great height in a compact flock and tumbling in the air head over heels . The runt is a bird of great size , with long massive beak and large feet ; some of the sub - breeds ...
... common tumbler has the singular inherited habit of flying at a great height in a compact flock and tumbling in the air head over heels . The runt is a bird of great size , with long massive beak and large feet ; some of the sub - breeds ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupial migration modification modified descendants natural selection naturalists nearly nest offspring organs ORIGIN OF SPECIES paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder theory tion trees variability variations varieties vary whole wings young