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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... plants , but without making any use of this habit . Soon afterward Fritz Müller discovered that the young stems of an Alisma and of a Linum - plants which do not climb and are widely separated in the natural system - revolved plainly ...
... plants , but without making any use of this habit . Soon afterward Fritz Müller discovered that the young stems of an Alisma and of a Linum - plants which do not climb and are widely separated in the natural system - revolved plainly ...
234 페이지
... plants , can be of any functional importance to them . But plants possess , in obedience to various stimuli , powers of movement , which are of manifest importance to them ; for instance , toward and more rarely from the light- in ...
... plants , can be of any functional importance to them . But plants possess , in obedience to various stimuli , powers of movement , which are of manifest importance to them ; for instance , toward and more rarely from the light- in ...
398 페이지
... plants living on the upper parts of the lofty island of Fernando Po , and on the neighboring Cameroon Mount- ains , in the Gulf of Guinea , are closely related to those on the mountains of Abyssinia , and likewise to those of tem ...
... plants living on the upper parts of the lofty island of Fernando Po , and on the neighboring Cameroon Mount- ains , in the Gulf of Guinea , are closely related to those on the mountains of Abyssinia , and likewise to those of tem ...
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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 divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally 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