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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vii 페이지
... Reasons for disbeliev- ing in great and abrupt modifications .. Page 168-204 - CHAPTER VIII . INSTINCT . Instincts comparable with habits , but different in their origin - Instincts graduated Aphides and ants - Instincts variable ...
... Reasons for disbeliev- ing in great and abrupt modifications .. Page 168-204 - CHAPTER VIII . INSTINCT . Instincts comparable with habits , but different in their origin - Instincts graduated Aphides and ants - Instincts variable ...
xii 페이지
... reasons are given for dis- believing in great and sudden modifications . Gradations of character , often accompanied by changes of function , are likewise here incidentally considered . 214 The statement with respect to young cuckoos ...
... reasons are given for dis- believing in great and sudden modifications . Gradations of character , often accompanied by changes of function , are likewise here incidentally considered . 214 The statement with respect to young cuckoos ...
xix 페이지
Charles Darwin. Zoolog . , Jan. 1851 ) , briefly gives his reason for believing that specific characters " sont fixés , pour chaque espèce , tant qu'elle se perpétue au milieu des mêmes circonstances : ils se modifient , si les ...
Charles Darwin. Zoolog . , Jan. 1851 ) , briefly gives his reason for believing that specific characters " sont fixés , pour chaque espèce , tant qu'elle se perpétue au milieu des mêmes circonstances : ils se modifient , si les ...
10 페이지
... reason why a peculiarity should appear at any particular age , yet that it does tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to be of the highest importance in ...
... reason why a peculiarity should appear at any particular age , yet that it does tend to appear in the offspring at the same period at which it first appeared in the parent . I believe this rule to be of the highest importance in ...
14 페이지
... reasons which I cannot here give , I am doubtfully inclined to believe , in opposition to several authors , that all the races belong to the same species . Having kept nearly all the English breeds of the fowl alive , having bred and ...
... reasons which I cannot here give , I am doubtfully inclined to believe , in opposition to several authors , that all the races belong to the same species . Having kept nearly all the English breeds of the fowl alive , having bred and ...
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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