On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
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9 페이지
... perfect - The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection 160 CHAPTER VII INSTINCT Instincts comparable with habits , but different in their origin- Instincts graduated - Aphides ...
... perfect - The law of Unity of Type and of the Conditions of Existence embraced by the theory of Natural Selection 160 CHAPTER VII INSTINCT Instincts comparable with habits , but different in their origin- Instincts graduated - Aphides ...
25 페이지
... perfect reversion had ensued . It would be quite necessary , in order to prevent the effects of intercrossing , that only a single variety should be turned loose in its new home . Nevertheless , as our varieties certainly do ...
... perfect reversion had ensued . It would be quite necessary , in order to prevent the effects of intercrossing , that only a single variety should be turned loose in its new home . Nevertheless , as our varieties certainly do ...
26 페이지
... perfect fertility of varieties when crossed , -a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as , only in most cases in a lesser degree than , do closely - allied ...
... perfect fertility of varieties when crossed , -a subject hereafter to be discussed ) , domestic races of the same species differ from each other in the same manner as , only in most cases in a lesser degree than , do closely - allied ...
31 페이지
... perfect plumage is acquired varies , as does the state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition ...
... perfect plumage is acquired varies , as does the state of the down with which the nestling birds are clothed when hatched . The shape and size of the eggs vary . The manner of flight , and in some breeds the voice and disposition ...
35 페이지
... perfect series between the extremes of structure . Thirdly , those characters which are mainly distinctive of each breed , for instance the wattle and length of beak of the carrier , the shortness of that of the tumbler , and the number ...
... perfect series between the extremes of structure . Thirdly , those characters which are mainly distinctive of each breed , for instance the wattle and length of beak of the carrier , the shortness of that of the tumbler , and the number ...
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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