On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1888 - 458페이지 |
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83개의 결과 중 1 - 5개
vi 페이지
... THEORY . - Difficulties of the theory of descent with modification Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species - Species with habits widely different from those of ...
... THEORY . - Difficulties of the theory of descent with modification Absence or rarity of transitional varieties - Transitions in habits of life - Diversified habits in the same species - Species with habits widely different from those of ...
vii 페이지
... THEORY OF NATURAL SELECTION . Longevity - Modifications not necessarily simultaneous - Modifications apparently of no direct service - Progressive development - Characters of small functional importance , the most constant - Supposed ...
... THEORY OF NATURAL SELECTION . Longevity - Modifications not necessarily simultaneous - Modifications apparently of no direct service - Progressive development - Characters of small functional importance , the most constant - Supposed ...
ix 페이지
... theory of Natural Selection - Recapitulation of the general and special circumstances in its favour - Causes of the general belief in the mmutability of species How far the theory of Natural Selection may be extended Effects of its ...
... theory of Natural Selection - Recapitulation of the general and special circumstances in its favour - Causes of the general belief in the mmutability of species How far the theory of Natural Selection may be extended Effects of its ...
xxi 페이지
... theory of 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 ...
... theory of 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
... gravest difficulties in accepting the theory will be given namely , first , the difficulties of transitions , or how a simple being or a simple organ can be changed and 2 Introduction . CHAPTER I VARIATION UNDER DOMESTICATION.
... gravest difficulties in accepting the theory will be given namely , first , the difficulties of transitions , or how a simple being or a simple organ can be changed and 2 Introduction . CHAPTER I VARIATION UNDER DOMESTICATION.
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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 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