The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 1-2권D. Appleton, 1917 |
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55 페이지
... certain species of butterflies , in the Malayan archipelago , regularly appear under two or even three conspicuously distinct forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary ...
... certain species of butterflies , in the Malayan archipelago , regularly appear under two or even three conspicuously distinct forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary ...
116 페이지
... certain insects depended in main part on its nectar for food . I could give many facts showing how anxious bees are to save time : for instance , their habit of cutting holes and sucking the nectar at the bases of certain flowers ...
... certain insects depended in main part on its nectar for food . I could give many facts showing how anxious bees are to save time : for instance , their habit of cutting holes and sucking the nectar at the bases of certain flowers ...
107 페이지
... certain extent these two grand divisions . No one will deny that the Hipparion is intermediate between the existing horse and certain older ungulate forms . What a wonderful connecting CHAP . XI . ] AFFINITIES OF EXTINCT SPECIES . 107.
... certain extent these two grand divisions . No one will deny that the Hipparion is intermediate between the existing horse and certain older ungulate forms . What a wonderful connecting CHAP . XI . ] AFFINITIES OF EXTINCT SPECIES . 107.
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adapted affinity allied species ancient animals appear Archipelago beak become believe belonging birds breeds Cambrian cause characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt eggs embryo Europe existing extinct extremely facts favourable fertilised fertility fish flowers formation formerly forms fossil Fritz Müller Gärtner genera genus geological geological period Glacial period gradations groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly occur oceanic islands offspring organisation parent peculiar perfect pigeon pistil plants pollen present probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance seeds Silurian slight South America stage stamens sterility structure successive suppose theory tion variability variations varieties vary whilst whole widely different wings