The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for LifeP.F. Collier & son, 1902 - 356ÆäÀÌÁö |
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3 ÆäÀÌÁö
... VARIATION UNDER DOMESTICATION Causes of Variability - Effects of Habit and the use or disuse of Parte-- Correlated Variation - Inheritance - Character of Domestic Varieties- Difficulty of distinguishing between Varieties and Species ...
... VARIATION UNDER DOMESTICATION Causes of Variability - Effects of Habit and the use or disuse of Parte-- Correlated Variation - Inheritance - Character of Domestic Varieties- Difficulty of distinguishing between Varieties and Species ...
28 ÆäÀÌÁö
... variation under domestication , afforded the best and safest clew . I may venture to ex- press my conviction of the ... variations . I will then pass on to the variability of spe- cies in a state of nature ; but I shall , unfortunately ...
... variation under domestication , afforded the best and safest clew . I may venture to ex- press my conviction of the ... variations . I will then pass on to the variability of spe- cies in a state of nature ; but I shall , unfortunately ...
31 ÆäÀÌÁö
... VARIATION UNDER DOMESTICATION Causes of Variability - Effects of Habit and the use or disuse of Parts-- Correlated Variation - Inheritance - Character of Domestic Varieties- Difficulty of distinguishing between Varieties and Species ...
... VARIATION UNDER DOMESTICATION Causes of Variability - Effects of Habit and the use or disuse of Parts-- Correlated Variation - Inheritance - Character of Domestic Varieties- Difficulty of distinguishing between Varieties and Species ...
32 ÆäÀÌÁö
... variations some- times arise under , as far as we can judge , dissimilar con- ditions ; and , on the other hand , the other hand , dissimilar variations . arise under conditions which appear to be nearly uni- form . The effects on the ...
... variations some- times arise under , as far as we can judge , dissimilar con- ditions ; and , on the other hand , the other hand , dissimilar variations . arise under conditions which appear to be nearly uni- form . The effects on the ...
33 ÆäÀÌÁö
... variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause were to act uni . formly during a long series of generations on many individuals , all probably would be modified in the same ...
... variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause were to act uni . formly during a long series of generations on many individuals , all probably would be modified in the same ...
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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 lamell©¡ larv©¡ 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