 | Royal Institution of Great Britain - 1862 - 572 페이지
...quadrupeds, moreover, are more prolific than large ones. Those of the bulk of the mastodons. rnegatheria, glyptodons, and diprotodons, are uniparous. The actual...circumstances which may be illustrated by the fable of the " Oak and the Reed;" the smaller and feebler animals have bent and accommodated themselves to... | |
 | 998 페이지
...Owen visualized natural selection as eliminating species but not as creating new ones. Owen continued: The actual presence, therefore, of small species of...families formerly existed, is not the consequence of any gradual diminution of the size of such species, but is the result of circumstances which may be... | |
 | 1858 - 950 페이지
...species conceal themselves and escape. Smaller animals are usually also more prolific than larger ones. " The actual presence, therefore, of small species of...families formerly existed, is not the consequence of any gradual diminution of the size of such species, but is the result of circumstances which may be... | |
 | 1852 - 960 페이지
...conceal themselves and escape. Smaller quadrupeds, are usually also, more prolific than larger ones. The actual presence, therefore, of small species of animals in countries where the larger species of the same natural families formerly existed, is not to be ascribed to any gradual... | |
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... of any gradual diminution of the size — of such species, but is the result of circumstances which may be illustrated by the fable of the " Oak and the Reed; " the smaller and feebler animals have bent and accommodated themselves to changes to which... 
