The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1920 - 432페이지 |
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xii 페이지
... existing groups . On earth adhering to the feet of migratory birds . On the wide geographical range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and modified . 516 358 Homological ...
... existing groups . On earth adhering to the feet of migratory birds . On the wide geographical range of a species of Galaxias , a fresh - water fish . Discussion on analogical resemblances , enlarged and modified . 516 358 Homological ...
xiii 페이지
... existing forms of life are the descendants by true generation of pre - exist- ing forms . Passing over allusions to the subject in the classical writers , * the first author who in modern times has treated it in a scientific spirit was ...
... existing forms of life are the descendants by true generation of pre - exist- ing forms . Passing over allusions to the subject in the classical writers , * the first author who in modern times has treated it in a scientific spirit was ...
xiv 페이지
... existing forms , and much to use and disuse , that is , to the effects of habit . To this latter agency he seems to attribute all the beautiful adapta- tions in nature ; -such as the long neck of the giraffe for browsing on the branches ...
... existing forms , and much to use and disuse , that is , to the effects of habit . To this latter agency he seems to attribute all the beautiful adapta- tions in nature ; -such as the long neck of the giraffe for browsing on the branches ...
xv 페이지
... existing , a darker and a darker race would in the course of time occur : and as the darkest would be the best fitted for the climate , this would at length become the most pre- valent , if not the only race , in the particular country ...
... existing , a darker and a darker race would in the course of time occur : and as the darkest would be the best fitted for the climate , this would at length become the most pre- valent , if not the only race , in the particular country ...
xx 페이지
... existing species may have been chemically affected by circum- ambient molecules of a particular nature , and thus have given rise to new forms . In this same year , 1853 , Dr. Schaaffhausen published an excel- lent pamphlet ( ' Verhand ...
... existing species may have been chemically affected by circum- ambient molecules of a particular nature , and thus have given rise to new forms . In this same year , 1853 , Dr. Schaaffhausen published an excel- lent pamphlet ( ' Verhand ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely fact favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young