On the Origin of the Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1869 - 596페이지 |
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38개의 결과 중 1 - 5개
17 페이지
... 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 ...
24 페이지
... ranked by him as well - defined species . Moreover , I do not believe that any ornithologist would place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more espe cially ...
... ranked by him as well - defined species . Moreover , I do not believe that any ornithologist would place the English carrier , the short - faced tumbler , the runt , the barb , pouter , and fantail in the same genus ; more espe cially ...
39 페이지
... ranked . at their first appearance as distinct varieties , and whether or not two or more species or races have be- come blended together by crossing , may plainly be recognised in the increased size and beauty which we now see in the ...
... ranked . at their first appearance as distinct varieties , and whether or not two or more species or races have be- come blended together by crossing , may plainly be recognised in the increased size and beauty which we now see in the ...
54 페이지
... 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 ...
55 페이지
... ranked as species by at least some com- petent judges . That varieties of this doubtful nature are far from uncommon cannot be disputed . Compare the several floras of Great Britain , of France , or of the United States , drawn up by ...
... ranked as species by at least some com- petent judges . That varieties of this doubtful nature are far from uncommon cannot be disputed . Compare the several floras of Great Britain , of France , or of the United States , drawn up by ...
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accumulated adapted affinities allied species America ancient appear Asa Gray become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt Edition eggs embryo existing exterminated extinct extremely facts favourable females fertilised fertility flowers formation forms fossil Fritz Müller Gärtner genera genus geological Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ less living males mammals manner migration modified descendants natural selection naturalists nearly nest occur oceanic islands offspring organisation parent perfect pigeons pistil pollen Post 8vo present principle probably produced progenitor racters ranked reciprocal crosses remarked resemble seeds sexual sexual selection Silurian slight South America stamens sterility structure struggle successive suppose theory tion variability variations varieties vary vols whole widely