The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
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ix 페이지
... present editions on various subjects , according as the evidence has become somewhat stronger or weaker . The more important corrections and some additions in the present volume are tabulated on the following page , for the convenience ...
... present editions on various subjects , according as the evidence has become somewhat stronger or weaker . The more important corrections and some additions in the present volume are tabulated on the following page , for the convenience ...
1 페이지
... present to the past in- habitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that mys- tery of mysteries , as it has been called by one ...
... present to the past in- habitants of that continent . These facts , as will be seen in the latter chapters of this volume , seemed to throw some light on the origin of species - that mys- tery of mysteries , as it has been called by one ...
6 페이지
... present welfare and , as I believe , the future success and modification of every inhabitant of this world . Still less do we know of the mutual rela- tions of the innumerable inhabitants of the world during the many past geological ...
... present welfare and , as I believe , the future success and modification of every inhabitant of this world . Still less do we know of the mutual rela- tions of the innumerable inhabitants of the world during the many past geological ...
23 페이지
... present the desired character ; but to obtain a race intermediate between two quite distinct races , would be very difficult . Sir J. Sebright expressly experimented with this object and failed . The offspring from the first cross ...
... present the desired character ; but to obtain a race intermediate between two quite distinct races , would be very difficult . Sir J. Sebright expressly experimented with this object and failed . The offspring from the first cross ...
37 페이지
... present day are compared with drawings made only twenty or thirty years ago . When a race of plants is once pretty well established , the seed- raisers do not pick out the best plants , but merely go over their seed - beds , and pull up ...
... present day are compared with drawings made only twenty or thirty years ago . When a race of plants is once pretty well established , the seed- raisers do not pick out the best plants , but merely go over their seed - beds , and pull up ...
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adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young