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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26 페이지
... cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which we al ! 1 know propagate their kind so truly , were the 26 VARIATION UNDER DOMESTICATION.
... cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which we al ! 1 know propagate their kind so truly , were the 26 VARIATION UNDER DOMESTICATION.
27 페이지
... kind so truly , were the offspring of any single species , then such facts would have great weight in making us doubt about the immutability of the many very closely allied natural species — for instance , of the many foxes - inhabiting ...
... kind so truly , were the offspring of any single species , then such facts would have great weight in making us doubt about the immutability of the many very closely allied natural species — for instance , of the many foxes - inhabiting ...
39 페이지
... kind of selection is , in fact , also followed ; for hardly any one is so careless as to allow his worst animals to breed . 66 " " In regard to plants , there is another means of observing the accumulated effects of selection - namely ...
... kind of selection is , in fact , also followed ; for hardly any one is so careless as to allow his worst animals to breed . 66 " " In regard to plants , there is another means of observing the accumulated effects of selection - namely ...
41 페이지
... kind of Selection , which may be called Unconscious , and which results from every one trying to possess and breed from the best individual animals , is more important . Thus , a man who intends keeping pointers naturally tries to get ...
... kind of Selection , which may be called Unconscious , and which results from every one trying to possess and breed from the best individual animals , is more important . Thus , a man who intends keeping pointers naturally tries to get ...
42 페이지
... kind of unconscious selection going on . [ We see the value set on animals even by the barbarians of Tierra del Fuego , by their killing and devouring their old women , in times of dearth , as of less value than their dogs . ] In plants ...
... kind of unconscious selection going on . [ We see the value set on animals even by the barbarians of Tierra del Fuego , by their killing and devouring their old women , in times of dearth , as of less value than their dogs . ] In plants ...
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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