The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 95
... land may be extremely cold or dry , yet there will be competition . between some few species , or between the individuals of the same species , for the warmest or dampest spots . Hence we can see that when a plant or animal is placed in ...
... land may be extremely cold or dry , yet there will be competition . between some few species , or between the individuals of the same species , for the warmest or dampest spots . Hence we can see that when a plant or animal is placed in ...
Página 101
... land . And as foreigners have thus in every country beaten some of the natives , we may safely conclude that the natives might have been modified with advantage , so as to have better resisted the intruders . As man can produce , and ...
... land . And as foreigners have thus in every country beaten some of the natives , we may safely conclude that the natives might have been modified with advantage , so as to have better resisted the intruders . As man can produce , and ...
Página 123
... land - mol- lusca and earth - worms ; but these all pair . As yet I have not found a single terrestrial animal which can fertilise itself . This remarkable fact , which offers so strong a contrast with terrestrial plants , is ...
... land - mol- lusca and earth - worms ; but these all pair . As yet I have not found a single terrestrial animal which can fertilise itself . This remarkable fact , which offers so strong a contrast with terrestrial plants , is ...
Página 128
... land , & c . , the immigration of better adapted organisms ; and thus new places in the natural economy of the district will be left open to be filled up by the modification of the old inhabitants . Lastly , isolation will give time for ...
... land , & c . , the immigration of better adapted organisms ; and thus new places in the natural economy of the district will be left open to be filled up by the modification of the old inhabitants . Lastly , isolation will give time for ...
Página 130
... land . Consequently , the competition between fresh - water productions will have been less severe than elsewhere ; new forms will have been there more slowly produced , and old forms more slowly exterminated . And it is in fresh ...
... land . Consequently , the competition between fresh - water productions will have been less severe than elsewhere ; new forms will have been there more slowly produced , and old forms more slowly exterminated . And it is in fresh ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period 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 males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young