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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... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one ...
... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of domestic varieties from one ...
4 페이지
... variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , however , be enabled to ...
... variability of species in a state of nature ; but I shall , unfortunately , be compelled to treat this subject far too briefly , as it can be treated properly only by giving long catalogues of facts . We shall , however , be enabled to ...
6 페이지
... . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . 53 CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of Variability - 6 INTRODUCTION .
... . Furthermore , I am convinced that Natural Selection has been the most important , but not the exclusive , means of modification . 53 CHAPTER I. VARIATION UNDER DOMESTICATION . Causes of Variability - 6 INTRODUCTION .
7 페이지
... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one ...
... Variability - Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one ...
8 페이지
... variability may be partly connected with excess of food . It seems clear that organic beings must be ex- posed during several generations to new conditions to cause any great amount of variation ; and that , when the organisation has ...
... variability may be partly connected with excess of food . It seems clear that organic beings must be ex- posed during several generations to new conditions to cause any great amount of variation ; and that , when the organisation has ...
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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