The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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v 페이지
... Selection , anciently fol- lowed , their Effects - Methodical and Unconscious Selection - Un- known Origin of our Domestic Productions - Circumstances favour- able to Man's power of Selection 5-32 ... NATURAL SELECTION ; OR THE SURVIVAL OF.
... Selection , anciently fol- lowed , their Effects - Methodical and Unconscious Selection - Un- known Origin of our Domestic Productions - Circumstances favour- able to Man's power of Selection 5-32 ... NATURAL SELECTION ; OR THE SURVIVAL OF.
xv 페이지
... natural selection , and this is the first recognition which has been indicated ; but he applies it only to the races of man , and to certain characters alone . After remarking that negroes and mulattoes enjoy an immunity from certain ...
... natural selection , and this is the first recognition which has been indicated ; but he applies it only to the races of man , and to certain characters alone . After remarking that negroes and mulattoes enjoy an immunity from certain ...
xxi 페이지
... Natural Selection is promulgated by Mr. Wallace with admirable force and clearness . Von Baer , towards whom all zoologists feel so profound a respect , expressed about the year 1859 ( see Prof. Rudolph Wagner , Zoolo- gisch ...
... Natural Selection is promulgated by Mr. Wallace with admirable force and clearness . Von Baer , towards whom all zoologists feel so profound a respect , expressed about the year 1859 ( see Prof. Rudolph Wagner , Zoolo- gisch ...
3 페이지
... Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural Selection almost inevitably causes much Extinction of the less improved forms of life , and leads to what I have called Diver ...
... Natural Selection will be treated at some length in the fourth chapter ; and we shall then see how Natural Selection almost inevitably causes much Extinction of the less improved forms of life , and leads to what I have called Diver ...
27 페이지
... by a process of " natural selection , " as will hereafter be more fully explained , two sub - breeds might be formed . This , perhaps , partly explains why the varieties kept by savages , as has 3 CHAP . I. 27 Unconscious Selection .
... by a process of " natural selection , " as will hereafter be more fully explained , two sub - breeds might be formed . This , perhaps , partly explains why the varieties kept by savages , as has 3 CHAP . I. 27 Unconscious Selection .
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly 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 Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young