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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... trees which had been perpet- ually browsed down by the cattle . In one square yard , at a point some hundred yards distant from one of the old clumps , I counted thirty - two little trees ; and one of them , with twenty - six rings of ...
... trees which had been perpet- ually browsed down by the cattle . In one square yard , at a point some hundred yards distant from one of the old clumps , I counted thirty - two little trees ; and one of them , with twenty - six rings of ...
123 페이지
... tree to tree . That trees belonging to all Orders have their sexes more often separated than other plants , I find to be the case in this country ; and at my request Dr. Hooker tabulated the trees of New Zealand , and Dr. Asa Gray those ...
... tree to tree . That trees belonging to all Orders have their sexes more often separated than other plants , I find to be the case in this country ; and at my request Dr. Hooker tabulated the trees of New Zealand , and Dr. Asa Gray those ...
182 페이지
... trees would be little likely to reach distant oceanic islands ; and an herbaceous plant , which had no chance of suc- cessfully competing with the many fully developed trees growing on a continent , might , when established on an island ...
... trees would be little likely to reach distant oceanic islands ; and an herbaceous plant , which had no chance of suc- cessfully competing with the many fully developed trees growing on a continent , might , when established on an island ...
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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