Library of universal knowledge, science, Том 1P.F. Collier and Son., 1905 |
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Стр. 5
... Supposed incompetence of natural selection to account for the incipient stages of useful struc- tures - Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed ...
... Supposed incompetence of natural selection to account for the incipient stages of useful struc- tures - Causes which interfere with the acquisition through natural selection of useful structures - Gradations of structure with changed ...
Стр. 8
... supposed incompetency of natural selection to account for the incipient stages of useful structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural selection of useful structures ...
... supposed incompetency of natural selection to account for the incipient stages of useful structures . There is also a discussion on the causes which prevent in many cases the acquisition through natural selection of useful structures ...
Стр. 17
... supposed " impulses " account in a scientific sense for the numerous and beauti- ful coadaptations which we see throughout nature ; I can- not see that we thus gain any insight how , for instance , a woodpecker has become adapted to its ...
... supposed " impulses " account in a scientific sense for the numerous and beauti- ful coadaptations which we see throughout nature ; I can- not see that we thus gain any insight how , for instance , a woodpecker has become adapted to its ...
Стр. 22
... supposed to have been caused by some miasma , have arisen and spread over the world , so at certain periods the germs of existing species may have been chemically affected by circumambient molecules of a particular nature , and thus ...
... supposed to have been caused by some miasma , have arisen and spread over the world , so at certain periods the germs of existing species may have been chemically affected by circumambient molecules of a particular nature , and thus ...
Стр. 44
... supposed . The lake - inhabitants of Switzerland cultivated several kinds of wheat and barley , the pea , the poppy for oil , and flax ; and they possessed several domesticated animals . They also carried on com- merce with other ...
... supposed . The lake - inhabitants of Switzerland cultivated several kinds of wheat and barley , the pea , the poppy for oil , and flax ; and they possessed several domesticated animals . They also carried on com- merce with other ...
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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