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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... nearly re- lated to their parents . Hence very few of the original species will have transmitted offspring to the fourteen- thousandth generation . We may suppose that only one , ( F ) , of the two species ( E and F ) which were least ...
... nearly re- lated to their parents . Hence very few of the original species will have transmitted offspring to the fourteen- thousandth generation . We may suppose that only one , ( F ) , of the two species ( E and F ) which were least ...
343 페이지
... nearly so great as it at first appears : all this beautiful work can be shown , I think , to follow from a few ... nearly related to the latter ; it forms a nearly regular waxen comb of cylindrical cells , in which the young are hatched ...
... nearly so great as it at first appears : all this beautiful work can be shown , I think , to follow from a few ... nearly related to the latter ; it forms a nearly regular waxen comb of cylindrical cells , in which the young are hatched ...
132 페이지
... nearly related , replace each other . He hears from close- ly allied , yet distinct kinds of birds , notes nearly similar , and sees their nests similarly constructed , but not quite alike , with eggs coloured in nearly the same manner ...
... nearly related , replace each other . He hears from close- ly allied , yet distinct kinds of birds , notes nearly similar , and sees their nests similarly constructed , but not quite alike , with eggs coloured in nearly the same manner ...
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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