The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432 páginas |
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Página v
... 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.
... 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.
Página 3
... 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 , conse- quently , 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 , conse- quently , there is a ...
Página 10
... 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 ...
Página 22
... increasing size of the common gooseberry may be quoted . We see an astonishing im- provement 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 ...
... increasing size of the common gooseberry may be quoted . We see an astonishing im- provement 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 ...
Página 24
... increased in weight and in early maturity , compared with the stock formerly kept in this country . By comparing the accounts given in various old treatises of the former and present state of carrier and tumbler pigeons in Britain ...
... increased in weight and in early maturity , compared with the stock formerly kept in this country . By comparing the accounts given in various old treatises of the former and present state of carrier and tumbler pigeons in Britain ...
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Términos y frases comunes
accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ 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 resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young