The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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vii 페이지
... Widely different organs in members of the same class , de- veloped from one and the same source - Reasons for disbeliev- ing in great and abrupt modifications . 262 CHAPTER VIII . INSTINCT . Instincts comparable with habits ,. CONTENTS .
... Widely different organs in members of the same class , de- veloped from one and the same source - Reasons for disbeliev- ing in great and abrupt modifications . 262 CHAPTER VIII . INSTINCT . Instincts comparable with habits ,. CONTENTS .
x 페이지
... reasons are given for disbelieving in great and sudden modifications . Gradations of character , often accompanied by changes of function , are likewise here incidentally considered . The statement with respect to young cuckoos ejecting ...
... reasons are given for disbelieving in great and sudden modifications . Gradations of character , often accompanied by changes of function , are likewise here incidentally considered . The statement with respect to young cuckoos ejecting ...
xxii 페이지
... 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 circonstances ambiantes viennent à changer . " " En- résumé , l ...
... 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 circonstances ambiantes viennent à changer . " " En- résumé , l ...
16 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 ...
21 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 advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young