Library of universal knowledge, science, Том 1P.F. Collier and Son., 1905 |
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Стр. 4
... animals and plants - Nature of the checks to increase - Competition universal- Effects of climate - Protection from the number of individuals - Com- plex relations of all animals and plants throughout nature - Struggle for life most ...
... animals and plants - Nature of the checks to increase - Competition universal- Effects of climate - Protection from the number of individuals - Com- plex relations of all animals and plants throughout nature - Struggle for life most ...
Стр. 14
... animals tend to vary in some degree , and , secondly , that agriculturists improve their domesticated animals by selection ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy ...
... animals tend to vary in some degree , and , secondly , that agriculturists improve their domesticated animals by selection ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy ...
Стр. 31
... animals , one of the first points which strikes us is , that they generally differ more from each other than do the individuals of any one species or variety in a state of nature . And if we reflect on the vast diversity of the plants ...
... animals , one of the first points which strikes us is , that they generally differ more from each other than do the individuals of any one species or variety in a state of nature . And if we reflect on the vast diversity of the plants ...
Стр. 34
... animals when reared under new or unnatural conditions . Many facts clearly show how eminently susceptible the ... animals under confinement , I may men- tion that carnivorous animals , even from the tropics , breed in this country pretty ...
... animals when reared under new or unnatural conditions . Many facts clearly show how eminently susceptible the ... animals under confinement , I may men- tion that carnivorous animals , even from the tropics , breed in this country pretty ...
Стр. 36
... animals the increased use or disuse of parts has had a more marked influence ; thus I find in the domestic duck that ... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the ...
... animals the increased use or disuse of parts has had a more marked influence ; thus I find in the domestic duck that ... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the ...
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adapted admit affinities allied species America analogous ancient animals appear beak become bees believe belonging birds breeds cause cells characters climate closely allied color common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable fertility fishes flowers formation forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living Malay Archipelago male mammals manner marsupial migration modified descendants natural selection naturalists nearly nest offspring organs paleozoic parent peculiar perfect pigeon pistil plants pollen present principle probably produced progenitor quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion trees variability variations varieties vary whole wings young