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
83개의 결과 중 1 - 5개
7 페이지
... vary most -- Species of the larger genera in any country vary more than the species of the smaller genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and ...
... vary most -- Species of the larger genera in any country vary more than the species of the smaller genera - Many of the species of the larger genera resemble varieties in being very closely , but unequally , related to each other , and ...
8 페이지
... vary in an analogous manner - Reversions to long - lost characters - Summary 129 CHAPTER VI DIFFICULTIES ON THEORY Difficulties on the theory of descent with modification - Transitions— Absence or rarity of transitional varieties ...
... vary in an analogous manner - Reversions to long - lost characters - Summary 129 CHAPTER VI DIFFICULTIES ON THEORY Difficulties on the theory of descent with modification - Transitions— Absence or rarity of transitional varieties ...
16 페이지
... vary however slightly in any manner profitable to itself , under the complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance ...
... vary however slightly in any manner profitable to itself , under the complex and sometimes varying conditions of life , will have a better chance of surviving , and thus be naturally selected . From the strong principle of inheritance ...
19 페이지
... vary , it generally continues to vary for many generations . No case is on record of a variable being ceasing to be variable under cultivation . Our oldeşt cultivated plants , such as wheat , still often yield new varieties : our oldest ...
... vary , it generally continues to vary for many generations . No case is on record of a variable being ceasing to be variable under cultivation . Our oldeşt cultivated plants , such as wheat , still often yield new varieties : our oldest ...
21 페이지
... vary very slightly - perhaps hardly more than in a state of nature . 66 " " A long list could easily be given of " sporting plants ; by this term gardeners mean a single bud or offset , which suddenly assumes a new and sometimes very ...
... vary very slightly - perhaps hardly more than in a state of nature . 66 " " A long list could easily be given of " sporting plants ; by this term gardeners mean a single bud or offset , which suddenly assumes a new and sometimes very ...
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