On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeD. Appleton, 1909 - 430 páginas |
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Página 8
... important of all relations 63 CHAPTER IV NATURAL SELECTION Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes - Sexual Selection - On ...
... important of all relations 63 CHAPTER IV NATURAL SELECTION Natural Selection - its power compared with man's selection - its power on characters of trifling importance - its power at all ages and on both sexes - Sexual Selection - On ...
Página 15
... importance to gain a clear insight into the means of modification and CO- adaptation . At the commencement of my ... important , we shall see how great is the power of man in accumulating by his Selection successive slight variations ...
... importance to gain a clear insight into the means of modification and CO- adaptation . At the commencement of my ... important , we shall see how great is the power of man in accumulating by his Selection successive slight variations ...
Página 24
... importance to us , that peculiarities appearing in the males of our domestic breeds are often transmitted either exclusively , or in a much greater degree , to males alone . A much more important rule , which I think may be trusted , is ...
... importance to us , that peculiarities appearing in the males of our domestic breeds are often transmitted either exclusively , or in a much greater degree , to males alone . A much more important rule , which I think may be trusted , is ...
Página 40
... important . But it is very far from true that the principle is a modern discovery . I could give several references to the full acknowledgment of the importance of the principle in works of high antiquity . In rude and barbarous periods ...
... important . But it is very far from true that the principle is a modern discovery . I could give several references to the full acknowledgment of the importance of the principle in works of high antiquity . In rude and barbarous periods ...
Página 41
... important . Thus , a man who intends keeping pointers naturally tries to get as good dogs as he can , and afterwards breeds from his own best dogs , but he has no wish or expectation of permanently altering the breed . Nevertheless we ...
... important . Thus , a man who intends keeping pointers naturally tries to get as good dogs as he can , and afterwards breeds from his own best dogs , but he has no wish or expectation of permanently altering the breed . Nevertheless we ...
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Términos y frases comunes
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