On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeCassell, 1909 - 430페이지 |
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57 페이지
... into competition with each other , and more especially to the members of the same genus or class having nearly similar habits of life . With respect to commonness or the number of individuals of DOMINANT SPECIES VARY MOST 57.
... into competition with each other , and more especially to the members of the same genus or class having nearly similar habits of life . With respect to commonness or the number of individuals of DOMINANT SPECIES VARY MOST 57.
78 페이지
... similar changes of conditions might and do occur under nature . Let it also be borne in mind how infinitely complex and close - fitting are the mutual relations of all organic beings to each other and to their physical conditions of ...
... similar changes of conditions might and do occur under nature . Let it also be borne in mind how infinitely complex and close - fitting are the mutual relations of all organic beings to each other and to their physical conditions of ...
81 페이지
... similar means of subsistence and defence . No country can be named in which all the native inhabitants are now so perfectly adapted to each other and to the physical conditions under which they live , that none of them could anyhow be ...
... similar means of subsistence and defence . No country can be named in which all the native inhabitants are now so perfectly adapted to each other and to the physical conditions under which they live , that none of them could anyhow be ...
90 페이지
... inherit a tendency to a similar slight deviation of structure . The tubes of the corollas of the common red and incarnate clovers ( Trifolium pratense and incar- natum ) do not on a hasty glance appear to 90 NATURAL SELECTION.
... inherit a tendency to a similar slight deviation of structure . The tubes of the corollas of the common red and incarnate clovers ( Trifolium pratense and incar- natum ) do not on a hasty glance appear to 90 NATURAL SELECTION.
104 페이지
... similar character during many successive generations . In practice , a fancier is , for instance , struck by a pigeon having a slightly shorter beak ; another fancier is struck by a pigeon having a rather longer beak ; and on the ...
... similar character during many successive generations . In practice , a fancier is , for instance , struck by a pigeon having a slightly shorter beak ; another fancier is struck by a pigeon having a rather longer beak ; and on the ...
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accumulated adapted affinities allied species America analogous ancient animals appear archipelago become bees believe birds breeds cause cells characters cirripedes climate closely allied colour continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo endemic existing exterminated extinct extremely facts favourable fertilised fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate larvæ laws less living males mammals manner migration modification modified descendants natural selection naturalists nearly nest occasionally offspring organic organisation origin of species perfect pigeons plants pollen present principle probably produced progenitor ranked reciprocal crosses remarked resemble rock-pigeon rudimentary seeds sexual sexual selection Silurian slight sometimes South America sterility structure struggle successive supposed swimbladder tend theory variability variations varieties vary whole widely