The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for Life |
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Page 44
... organs . Man can hardly select , or only with much difficulty , any deviation of structure excepting such as is externally visible ; and indeed he rarely cares for what is internal . He can never act by selection , excepting on ...
... organs . Man can hardly select , or only with much difficulty , any deviation of structure excepting such as is externally visible ; and indeed he rarely cares for what is internal . He can never act by selection , excepting on ...
Page 54
... organs , and compare them in many specimens of the same species . It would never have been ex- pected that the branching of the main nerves close to the great central ganglion of an insect would have been variable in the same species ...
... organs , and compare them in many specimens of the same species . It would never have been ex- pected that the branching of the main nerves close to the great central ganglion of an insect would have been variable in the same species ...
Page 116
... organs and sometimes the female organs become more or less im- potent ; now if we suppose this to occur in ever so slight a degree under nature , then , as pollen is already carried regularly from flower to flower , and as a more ...
... organs and sometimes the female organs become more or less im- potent ; now if we suppose this to occur in ever so slight a degree under nature , then , as pollen is already carried regularly from flower to flower , and as a more ...
Page 120
... organs . Many flowers , on the other hand , have their organs of fructification closely en- closed , as in the great papilionaceous or pea - family ; but these almost invariably present beautiful and curious . adaptations in relation to ...
... organs . Many flowers , on the other hand , have their organs of fructification closely en- closed , as in the great papilionaceous or pea - family ; but these almost invariably present beautiful and curious . adaptations in relation to ...
Page 124
... organs of reproduction so per- fectly enclosed that access from without , and the oc- casional influence of a distinct individual , can be shown to be physically impossible . Cirripedes long appeared to me to present , under this point ...
... organs of reproduction so per- fectly enclosed that access from without , and the oc- casional influence of a distinct individual , can be shown to be physically impossible . Cirripedes long appeared to me to present , under this point ...
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Common terms and phrases
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