On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJ. Murray, 1860 - 502페이지 This is the 'second edition' of Darwin's Origin of Species. |
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4 페이지
... seems to me to be no explanation , for it leaves the case of the coadaptations of organic beings to each other and to their physical conditions of life , un- touched and unexplained . It is , therefore , of the highest importance to ...
... seems to me to be no explanation , for it leaves the case of the coadaptations of organic beings to each other and to their physical conditions of life , un- touched and unexplained . It is , therefore , of the highest importance to ...
7 페이지
... seems pretty clear that organic beings must be ex- posed during several generations to the new conditions of life to cause any appreciable amount of variation ; and that when the organisation has once begun to vary , it generally ...
... seems pretty clear that organic beings must be ex- posed during several generations to the new conditions of life to cause any appreciable amount of variation ; and that when the organisation has once begun to vary , it generally ...
11 페이지
... seems probable . There are many laws regulating variation , some few of which can be dimly seen , and will be hereafter briefly mentioned . I will here only allude to what may be called correlation of growth . Any change in the embryo ...
... seems probable . There are many laws regulating variation , some few of which can be dimly seen , and will be hereafter briefly mentioned . I will here only allude to what may be called correlation of growth . Any change in the embryo ...
15 페이지
... seems to me not improbable , that if we could succeed in naturalising , or were to cultivate , during many genera- tions , the several races , for instance , of the cabbage , in very poor soil ( in which case , however , some effect ...
... seems to me not improbable , that if we could succeed in naturalising , or were to cultivate , during many genera- tions , the several races , for instance , of the cabbage , in very poor soil ( in which case , however , some effect ...
18 페이지
... seems to me to be the case , what does it show , but that some of our breeds originated there , four or five thousand years ago ? But Mr. Horner's researches have ren- dered it in some degree probable that man sufficiently civilized to ...
... seems to me to be the case , what does it show , but that some of our breeds originated there , four or five thousand years ago ? But Mr. Horner's researches have ren- dered it in some degree probable that man sufficiently civilized to ...
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accumulated adapted affinities allied species America amount analogous ancient animals appear become bees believe birds breeds cause cells characters cirripedes climate closely allied colour common parent continuous crossed crustaceans degree difficulty distinct species divergence domestic doubt embryo Europe existing exterminated extinct extremely facts favourable Fcap fertility flowers formations forms fossil Gärtner genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hermaphrodites hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate land larvæ less living male mammals manner Marsupials migration modification modified descendants natural selection naturalists nearly nest oceanic islands offspring organisation perfect pigeons plants pollen present probably produced progenitor racters ranked reciprocal crosses remarked resemble rock-pigeon rudimentary organs seeds sexual selection Silurian slight South America sterility structure struggle successive supposed tend theory tion variability variations varieties vary whole widely