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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452 페이지
... crustaceans , the general pattern seems thus to have become partially obscured . There is another and equally curious branch of our sub- ject ; namely , serial homologies , or the comparison of the different parts or organs in the same ...
... crustaceans , the general pattern seems thus to have become partially obscured . There is another and equally curious branch of our sub- ject ; namely , serial homologies , or the comparison of the different parts or organs in the same ...
460 페이지
... crustaceans are born having their proper forms , while the marine members of the same two great classes pass through considerable and often great changes during their development . Spiders , again , barely undergo any metamorphosis ...
... crustaceans are born having their proper forms , while the marine members of the same two great classes pass through considerable and often great changes during their development . Spiders , again , barely undergo any metamorphosis ...
524 페이지
... Crustacea of New Zealand , 399 . Crustacean , blind , 131 . air - breathers , 181 . Crustaceans , their chelæ , 228 . Cryptocerus , 272 . Ctenomys , blind , 130 . Cuckoo , instinct of , 242 , 250 . Cunningham , Mr. , on the flight of ...
... Crustacea of New Zealand , 399 . Crustacean , blind , 131 . air - breathers , 181 . Crustaceans , their chelæ , 228 . Cryptocerus , 272 . Ctenomys , blind , 130 . Cuckoo , instinct of , 242 , 250 . Cunningham , Mr. , on the flight of ...
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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