The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권D. Appleton, 1898 |
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67개의 결과 중 1 - 5개
vi 페이지
... increase - Rapid increase of naturalised animals and plants - Nature of the checks to increase - Com- petition universal - Effects of Climate - Protection from the number of individuals - Complex relations of all animals and plants ...
... increase - Rapid increase of naturalised animals and plants - Nature of the checks to increase - Com- petition universal - Effects of Climate - Protection from the number of individuals - Complex relations of all animals and plants ...
5 페이지
... 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 ...
12 페이지
... increased use or disuse of parts has had a more marked influence ; thus 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 ...
... increased use or disuse of parts has had a more marked influence ; thus 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 ...
16 페이지
... 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 ...
37 페이지
... 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 compared with drawings made only twenty or thirty years ago . When a race of ...
... 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 compared with drawings made only twenty or thirty years ago . When a race of ...
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adapted advantage allied analogous animals and plants appear Asa Gray beak become bees believe birds breeds caudicle cause cells characters climate closely colour common crossed cuckoo degree descendants developed difficulty distinct species disuse divergence domestic animals domestic races doubt effects eggs existence extinct extremely facts favourable females flowers forms Fritz Müller genera genus giraffe gradations greater number groups habits Hence hermaphrodites hive-bee important increase inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ large number larger genera larvæ less males manner Melipona Mivart modified natural selection naturalists nearly nest occasionally offspring organisation organs origin Origin of Species parent perfect period pigeons pollen pollen-grains present preserved prey principle probably produced progenitor quadrupeds rank rarely Red Grouse relation remarked resemble rock-pigeon seeds sexes sexual selection slight stamens striped structure struggle supposed swimbladder tend tendency tion tree variability variations varieties vary widely wings young