The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435페이지 |
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xi 페이지
... certain mar- supial animals . On serial homologies , corrected . Mr. E. Ray Lankester on morphology . On the asexual reproduction of Chironomus . On the origin of rudimentary parts , corrected . Recapitulation on the sterility of ...
... certain mar- supial animals . On serial homologies , corrected . Mr. E. Ray Lankester on morphology . On the asexual reproduction of Chironomus . On the origin of rudimentary parts , corrected . Recapitulation on the sterility of ...
xiv 페이지
... certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already existing ...
... certain groups , and by the analogy of domestic produc- tions . With respect to the means of modification , he attributed something to the direct action of the physical conditions of life , something to the crossing of already existing ...
xvi 페이지
... certain characters alone . After remarking that ne- groes and mulattoes enjoy an immunity from certain tropical diseases , he observes , firstly , that all animals tend to vary in some degree , and , secondly , that agri- culturists ...
... certain characters alone . After remarking that ne- groes and mulattoes enjoy an immunity from certain tropical diseases , he observes , firstly , that all animals tend to vary in some degree , and , secondly , that agri- culturists ...
3 페이지
... certain trees , which has seeds that must be transported by certain birds , and INTRODUCTION . 3.
... certain trees , which has seeds that must be transported by certain birds , and INTRODUCTION . 3.
4 페이지
... certain birds , and which has flowers with separate sexes absolutely re- quiring the agency of certain insects to bring pollen from one flower to the other , it is equally preposterous to account for the structure of this parasite ...
... certain birds , and which has flowers with separate sexes absolutely re- quiring the agency of certain insects to bring pollen from one flower to the other , it is equally preposterous to account for the structure of this parasite ...
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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