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 18
... ranked by some competent judges as the descendants of aboriginally distinct species , and by other competent judges as mere varieties . If any well marked distinction existed between a domestic race and a species , this source of doubt ...
... ranked by some competent judges as the descendants of aboriginally distinct species , and by other competent judges as mere varieties . If any well marked distinction existed between a domestic race and a species , this source of doubt ...
Page 26
... ranked by him as well - defined species . Moreover , I do not believe that any ornithologist would in this case place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more ...
... ranked by him as well - defined species . Moreover , I do not believe that any ornithologist would in this case place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more ...
Page 41
... to be ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become blended together by crossing , may plainly be recognised CHAP . I. ] 41 UNCONSCIOUS SELECTION .
... to be ranked at their first appearance as distinct varieties , and whether or not two or more species or races have become blended together by crossing , may plainly be recognised CHAP . I. ] 41 UNCONSCIOUS SELECTION .
Page 57
... ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide ...
... ranked as a variety of another , not because the intermediate links have actually been found , but because analogy leads the observer to suppose either that they do now somewhere exist , or may formerly have existed ; and here a wide ...
Page 58
... ranked by bota- nists as species ; and in making this list he has omitted many trifling varieties , but which nevertheless have been ranked by some botanists as species , and he has entirely omitted several highly polymorphic genera ...
... ranked by bota- nists as species ; and in making this list he has omitted many trifling varieties , but which nevertheless have been ranked by some botanists as species , and he has entirely omitted several highly polymorphic genera ...
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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 lamellę larvę 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