The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538ÆäÀÌÁö |
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340 ÆäÀÌÁö
... land , or as a submarine surface near land , on which sediment was not deposited , or as the bed of an open and unfathomable sea . Looking to the existing oceans , which are thrice as ex- tensive as the land , we see them studded with ...
... land , or as a submarine surface near land , on which sediment was not deposited , or as the bed of an open and unfathomable sea . Looking to the existing oceans , which are thrice as ex- tensive as the land , we see them studded with ...
411 ÆäÀÌÁö
... land- shells in Madeira , or of endemic birds in the Galapagos Archipelago , with the number found on any continent , and then compare the area of the island with that of the continent , we shall see that this is true . This fact might ...
... land- shells in Madeira , or of endemic birds in the Galapagos Archipelago , with the number found on any continent , and then compare the area of the island with that of the continent , we shall see that this is true . This fact might ...
416 ÆäÀÌÁö
... land - shells , gener- ally by endemic species , but sometimes by species found elsewhere , striking instances of which have been given by Dr. A. A. Gould in relation to the Pacific . Now it is notorious that land - shells are easily ...
... land - shells , gener- ally by endemic species , but sometimes by species found elsewhere , striking instances of which have been given by Dr. A. A. Gould in relation to the Pacific . Now it is notorious that land - shells are easily ...
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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 lamell©¡ larv©¡ 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