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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84개의 결과 중 1 - 5개
v 페이지
... Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently fol- lowed , their Effects ...
... Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principles of Selection , anciently fol- lowed , their Effects ...
vi 페이지
... DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification ― - - Absence or rarity of ... difficulty - Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect The ...
... DIFFICULTIES OF THE THEORY . Difficulties of the theory of descent with modification ― - - Absence or rarity of ... difficulty - Natura non facit saltum - Organs of small importance - Organs not in all cases absolutely perfect The ...
vii 페이지
... Difficulties of the theory of the Natural Selection of instincts - Neuter or sterile insects Summary 205-234 - CHAPTER IX . HYBRIDISM . - Distinction between the sterility of first crosses and of hybrids - Sterility various in degree ...
... Difficulties of the theory of the Natural Selection of instincts - Neuter or sterile insects Summary 205-234 - CHAPTER IX . HYBRIDISM . - Distinction between the sterility of first crosses and of hybrids - Sterility various in degree ...
ix 페이지
... difficulties in classification , explained on the theory of descent with modification - Classification of varieties - Descent always used in classification - Analogical or adaptive characters - Affinities , general , complex , and ...
... difficulties in classification , explained on the theory of descent with modification - Classification of varieties - Descent always used in classification - Analogical or adaptive characters - Affinities , general , complex , and ...
xvii 페이지
... difficulty in ascertaining affinities ; second , of another impulse connected with the vital forces , tending in the course of generations , to modify organic structures in accor dance with external circumstances , as food , the nature ...
... difficulty in ascertaining affinities ; second , of another impulse connected with the vital forces , tending in the course of generations , to modify organic structures in accor dance with external circumstances , as food , the nature ...
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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