On the Origin of Species by Means of Natural Selection: Or The Preservation of Favored Races in the Struggle for Life, 2±ÇD. Appleton, 1888 - 458ÆäÀÌÁö |
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... increase Rapid increase of naturalised animals and plants Nature of the checks to increase Competition universal-- Effects of climate - Protection from the number of individuals— Complex relations of all animals and plants throughout ...
... increase Rapid increase of naturalised animals and plants Nature of the checks to increase Competition universal-- Effects of climate - Protection from the number of individuals— Complex relations of all animals and plants throughout ...
3 ÆäÀÌÁö
... increase , will be considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , consequently , there is a ...
... increase , will be considered . This is the doctrine of Malthus , applied to the whole animal and vegetable kingdoms . As many more individuals of each species are born than can possibly survive ; and as , consequently , there is a ...
11 ÆäÀÌÁö
... increased length of the horns in the offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may here refer to a ...
... increased length of the horns in the offspring from a short - horned cow by a long - horned bull , though appearing late in life , is clearly due to the male element . Having alluded to the subject of reversion , I may here refer to a ...
23 ÆäÀÌÁö
... the aboriginal stock . We have proofs that this has not been so in several cases in which exact records have been kept ; thus , to give a very trifling instance , the steadily - increasing size of CHAP . I. 23 Selection by Man .
... the aboriginal stock . We have proofs that this has not been so in several cases in which exact records have been kept ; thus , to give a very trifling instance , the steadily - increasing size of CHAP . I. 23 Selection by Man .
24 ÆäÀÌÁö
... increasing size of the common gooseberry may be quoted . We see an astonishing improvement in many florists ' flowers , when the flowers of the present day are com- pared with drawings made only twenty or thirty years ago . When a race ...
... increasing size of the common gooseberry may be quoted . We see an astonishing improvement in many florists ' flowers , when the flowers of the present day are com- pared with drawings made only twenty or thirty years ago . When a race ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamell©¡ larv©¡ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed tend theory tion variability variations varieties vary whilst whole wings young