The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
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vi 페이지
... important of all relations . • Page 75 CHAPTER IV . NATURAL SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ...
... important of all relations . • Page 75 CHAPTER IV . NATURAL SELECTION ; OR THE SURVIVAL OF THE FITTEST . Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ...
4 페이지
... importance to gain a clear insight into the means of modification and co- adaptation . At the commencement of my ... important , we shall see how great is the power of man in accumulating by his Selection successive slight variations ...
... importance to gain a clear insight into the means of modification and co- adaptation . At the commencement of my ... important , we shall see how great is the power of man in accumulating by his Selection successive slight variations ...
6 페이지
... importance , for they determine the present welfare and , as I believe , the future success and modification of every ... important , but not the exclusive , means of modification . 53 CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of ...
... importance , for they determine the present welfare and , as I believe , the future success and modification of every ... important , but not the exclusive , means of modification . 53 CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of ...
8 페이지
... important ; for nearly similar vari- ations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects ...
... important ; for nearly similar vari- ations sometimes arise under , as far as we can judge , dissimilar conditions ; and , on the other hand , dissimilar variations arise under conditions which appear to be nearly uniform . The effects ...
9 페이지
... important part in the forma- tion of our domestic races . We see indefinite vari- ability in the endless slight peculiarities which distinguish the individuals of the same species , and which cannot be accounted for by inheritance from ...
... important part in the forma- tion of our domestic races . We see indefinite vari- ability in the endless slight peculiarities which distinguish the individuals of the same species , and which cannot be accounted for by inheritance from ...
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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young