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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149 페이지
... similar cases of analogous variation have been observed by Naudir in the great gourd family , and by various authors in or cereals . Similar cases occurring with insects under na ural conditions have lately been discussed with much abi ...
... similar cases of analogous variation have been observed by Naudir in the great gourd family , and by various authors in or cereals . Similar cases occurring with insects under na ural conditions have lately been discussed with much abi ...
181 페이지
... similar organs , as far as function is concerned , in distinct organic beings , which owe none of their structure in common to inheritance from a common progenitor . Fritz Müller , in order to test the conclusions arrived at in this ...
... similar organs , as far as function is concerned , in distinct organic beings , which owe none of their structure in common to inheritance from a common progenitor . Fritz Müller , in order to test the conclusions arrived at in this ...
442 페이지
... similar exciting causes in a similar manner ; and this would obviously aid in the ac- quirement through natural selection of parts or organs , strikingly like each other , independently of their direct inheritance from a common ...
... similar exciting causes in a similar manner ; and this would obviously aid in the ac- quirement through natural selection of parts or organs , strikingly like each other , independently of their direct inheritance from a common ...
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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