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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15 페이지
... instance , of the woodpecker , with its feet , tail , beak , and tongue , so admirably adapted to catch insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds ...
... instance , of the woodpecker , with its feet , tail , beak , and tongue , so admirably adapted to catch insects under the bark of trees . In the case of the mistletoe , which draws its nourishment from certain trees , which has seeds ...
21 페이지
... instance , the rabbit and ferret kept in hutches ) , showing that their reproductive system has not been thus affected ; so will some animals and plants withstand domestication or cultivation , and vary very slightly - perhaps hardly ...
... instance , the rabbit and ferret kept in hutches ) , showing that their reproductive system has not been thus affected ; so will some animals and plants withstand domestication or cultivation , and vary very slightly - perhaps hardly ...
22 페이지
... instance , I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild - duck ; and I presume that this change may be safely ...
... instance , I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild - duck ; and I presume that this change may be safely ...
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
... instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog has been produced under domestication ...
... instance , of the many foxes - inhabiting different quarters of the world . I do not believe , as we shall presently see , that the whole amount of difference between the several breeds of the dog has been produced under domestication ...
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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