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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7 페이지
... Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principle of Selection anciently followed , its Effects ...
... Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principle of Selection anciently followed , its Effects ...
8 페이지
... varieties of the same species ; often severe between species of the same genus - The relation of organism to organism the most important of all relations 63 CHAPTER IV NATURAL SELECTION Natural Selection - its power compared with man's ...
... varieties of the same species ; often severe between species of the same genus - The relation of organism to organism the most important of all relations 63 CHAPTER IV NATURAL SELECTION Natural Selection - its power compared with man's ...
9 페이지
... varieties when crossed and of their mongrel offspring not universal - Hybrids and mongrels compared independently of ... varieties at the present day - On the nature of extinct intermediate varieties ; on their number- 73 — A * On the ...
... varieties when crossed and of their mongrel offspring not universal - Hybrids and mongrels compared independently of ... varieties at the present day - On the nature of extinct intermediate varieties ; on their number- 73 — A * On the ...
16 페이지
... varieties when intercrossed ; and fourthly , the imperfection of the Geological Record . In the next chapter I shall consider the geological succession of organic beings throughout time ; in the eleventh and twelfth , their geographical ...
... varieties when intercrossed ; and fourthly , the imperfection of the Geological Record . In the next chapter I shall consider the geological succession of organic beings throughout time ; in the eleventh and twelfth , their geographical ...
19 페이지
... Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principle of Selection anciently followed , its Effects ...
... Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more Species - Domestic Pigeons , their Differences and Origin - Principle of Selection anciently followed , its Effects ...
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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