On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430페이지 |
도서 본문에서
100개의 결과 중 1 - 5개
7 페이지
... closely , but unequally , related to each other , and in having restricted ranges CHAPTER III STRUGGLE FOR EXISTENCE 49 Its bearing on natural selection - The term used in a wide sense- Geometrical ratio of increase - Rapid increase of ...
... closely , but unequally , related to each other , and in having restricted ranges CHAPTER III STRUGGLE FOR EXISTENCE 49 Its bearing on natural selection - The term used in a wide sense- Geometrical ratio of increase - Rapid increase of ...
26 페이지
... closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races of the same species , also , often have a somewhat monstrous character ; by ...
... closely allied species , we generally perceive in each domestic race , as already remarked , less uniformity of character than in true species . Domestic races of the same species , also , often have a somewhat monstrous character ; by ...
27 페이지
... closely allied natural species — for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
... closely allied natural species — for instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog ...
34 페이지
... closely related together , though it is unsupported by a single experiment . But to extend the hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should ...
... closely related together , though it is unsupported by a single experiment . But to extend the hypothesis so far as to suppose that species , aboriginally as distinct as carriers , tumblers , pouters , and fantails now are , should ...
39 페이지
... closely allied sub - breeds . And when a cross has been made , the closest selection is far more indispensable even than in ordinary cases . If selection consisted merely in separating some very distinct variety , and breeding from it ...
... closely allied sub - breeds . And when a cross has been made , the closest selection is far more indispensable even than in ordinary cases . If selection consisted merely in separating some very distinct variety , and breeding from it ...
기타 출판본 - 모두 보기
자주 나오는 단어 및 구문
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