The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1890 - 458페이지 |
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165 페이지
... Look at the family of squirrels ; here we have the finest gradation from animals with their tails only slightly flat- tened , and from others , as Sir J. Richardson has remarked , with the posterior part of their bodies rather wide and ...
... Look at the family of squirrels ; here we have the finest gradation from animals with their tails only slightly flat- tened , and from others , as Sir J. Richardson has remarked , with the posterior part of their bodies rather wide and ...
239 페이지
... Look at the many out- lying islands round a continent , and see how many of their inhabitants can be raised only to the rank of doubtful species . So it is if we look to past times , and compare the species which have just passed away ...
... Look at the many out- lying islands round a continent , and see how many of their inhabitants can be raised only to the rank of doubtful species . So it is if we look to past times , and compare the species which have just passed away ...
365 페이지
... look at the selaceans or sharks , from their approach in some important points of structure to reptiles , as the high- est fish ; others look at the teleosteans as the highest . The ganoids stand intermediate between the selaceans and ...
... look at the selaceans or sharks , from their approach in some important points of structure to reptiles , as the high- est fish ; others look at the teleosteans as the highest . The ganoids stand intermediate between the selaceans and ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young