On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1888 - 458 páginas |
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Página v
... Selection , anciently fol- lowed , their Effects - Methodical and Unconscious Selection known Origin of our Domestic Productions - Circumstances favour- able to Man's power of Selection - CHAPTER II ... NATURAL SELECTION ; OR THE SURVIVAL OF.
... Selection , anciently fol- lowed , their Effects - Methodical and Unconscious Selection known Origin of our Domestic Productions - Circumstances favour- able to Man's power of Selection - CHAPTER II ... NATURAL SELECTION ; OR THE SURVIVAL OF.
Página xxi
... 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 ...
Página 3
... 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 ...
Página 27
... 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 .
Página 28
... select , or only with much difficulty , any deviation of structure excepting such as is externally visible ; and indeed he rarely cares for what is internal . He can never act by selection , excepting on variations which are first given ...
... select , or only with much difficulty , any deviation of structure excepting such as is externally visible ; and indeed he rarely cares for what is internal . He can never act by selection , excepting on variations which are first given ...
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Términos y frases comunes
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 formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number 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 tend theory tion variability variations varieties vary whilst whole wings young