The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, Volumes 1-2D. Appleton, 1917 - Evolution |
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Page 141
... supposed to be extremely slight , but of the most diversified nature ; they are not supposed all to appear simultaneously , but often after long intervals of time ; nor are they all supposed to endure for equal periods . Only those ...
... supposed to be extremely slight , but of the most diversified nature ; they are not supposed all to appear simultaneously , but often after long intervals of time ; nor are they all supposed to endure for equal periods . Only those ...
Page 148
... supposed pro- genitor of our several new sub - genera and genera . It is worth while to reflect for a moment on the character of the new species F14 , which is supposed not to have diverged much in character , but to have retained the ...
... supposed pro- genitor of our several new sub - genera and genera . It is worth while to reflect for a moment on the character of the new species F14 , which is supposed not to have diverged much in character , but to have retained the ...
Page 149
... supposed to be represented in the diagram . And the two new families , or orders , are descended from two species of the original genus , and these are supposed to be descended from some still more ancient and unknown form . We have ...
... supposed to be represented in the diagram . And the two new families , or orders , are descended from two species of the original genus , and these are supposed to be descended from some still more ancient and unknown form . We have ...
Contents
VARIATION UNDER DOMESTICATION | 7 |
CHAPTER II | 51 |
STRUGGLE FOR EXISTENCE | 66 |
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Common terms and phrases
adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings