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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254 페이지
... nest of their own , placed in singular ill - adapted situations , as on the leaves of a large thistle . They never , however , as far as Mr. Hudson has ascertained , complete a nest for themselves . They often lay so many eggs - from ...
... nest of their own , placed in singular ill - adapted situations , as on the leaves of a large thistle . They never , however , as far as Mr. Hudson has ascertained , complete a nest for themselves . They often lay so many eggs - from ...
257 페이지
... nest . Hence , he considers them as strictly household slaves . The masters , on the other hand , may be con- stantly seen bringing in materials for the nest , and food of all kinds . During the year 1860 , however , in the month of ...
... nest . Hence , he considers them as strictly household slaves . The masters , on the other hand , may be con- stantly seen bringing in materials for the nest , and food of all kinds . During the year 1860 , however , in the month of ...
258 페이지
... nest of the slave - making F. sanguinea ; and when I had accidentally disturbed both nests , the little ants attacked their big neighbors with sur- prising courage . Now I was curious to ascertain whether F. sanguinea could distinguish ...
... nest of the slave - making F. sanguinea ; and when I had accidentally disturbed both nests , the little ants attacked their big neighbors with sur- prising courage . Now I was curious to ascertain whether F. sanguinea could distinguish ...
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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