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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58 페이지
... called incipient species , become ultimately converted into good and distinct species , which in most cases obviously differ from each other far more than do the varieties of the same species ? How do those groups of species , which ...
... called incipient species , become ultimately converted into good and distinct species , which in most cases obviously differ from each other far more than do the varieties of the same species ? How do those groups of species , which ...
502 페이지
... called aberrant , and which may fancifully be called living fossils , will aid us in forming a picture of the ancient forms of life . Embryology will often reveal to us the structure , in some degree obscured , of the prototypes of each ...
... called aberrant , and which may fancifully be called living fossils , will aid us in forming a picture of the ancient forms of life . Embryology will often reveal to us the structure , in some degree obscured , of the prototypes of each ...
515 페이지
... called workers . OCELLI . - The simple eyes or stemmata of Insects , usually situated on the crown of the head between the great compound eyes . ESOPHAGUS . - The gullet . OOLITIC . - A great series of secondary rocks , so called from ...
... called workers . OCELLI . - The simple eyes or stemmata of Insects , usually situated on the crown of the head between the great compound eyes . ESOPHAGUS . - The gullet . OOLITIC . - A great series of secondary rocks , so called from ...
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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