On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430ÆäÀÌÁö |
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7 ÆäÀÌÁö
... 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 ÆäÀÌÁö
... 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 ÆäÀÌÁö
... 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 ÆäÀÌÁö
... 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 ÆäÀÌÁö
... 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 ...
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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 larv©¡ 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