The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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... kind . This is rather an extreme estimate for most of the higher animals , but by no means so for many of the lower organ- isms . He then shows that if a single individual were born , which varied in some manner , giving it twice as ...
... kind . This is rather an extreme estimate for most of the higher animals , but by no means so for many of the lower organ- isms . He then shows that if a single individual were born , which varied in some manner , giving it twice as ...
191 페이지
... kind open and colored so as to attract insects ; the other closed , not colored , destitute of nectar , and never visited by insects . Hence , we may conclude that , if insects had not been de- veloped on the face of the earth , our ...
... kind open and colored so as to attract insects ; the other closed , not colored , destitute of nectar , and never visited by insects . Hence , we may conclude that , if insects had not been de- veloped on the face of the earth , our ...
247 페이지
... kind of wolf , when young and without any training , as soon as it scented its prey , stand motionless like a statue , and then slowly crawl forward with a peculiar gait ; and another kind of wolf rushing round , instead of at , a herd ...
... kind of wolf , when young and without any training , as soon as it scented its prey , stand motionless like a statue , and then slowly crawl forward with a peculiar gait ; and another kind of wolf rushing round , instead of at , a herd ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced 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 oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion variability variations varieties vary whole widely different wings young