The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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88개의 결과 중 6 - 10개
xvii 페이지
... laws or secondary causes the orderly succession and progression of such organic phenomena may have been committed , we , as yet , are ignorant . " In his Address to the British Associa- tion , in 1858 , he speaks ( p . li . ) of " the ...
... laws or secondary causes the orderly succession and progression of such organic phenomena may have been committed , we , as yet , are ignorant . " In his Address to the British Associa- tion , in 1858 , he speaks ( p . li . ) of " the ...
xx 페이지
... laws of geographical distribu- 6 references in Godron's work Sur l'Espèce , ' it seems that Bory St. Vincent , Burdach , Poiret , and Fries , have all admitted that new species are continually being produced . I may add , that of the ...
... laws of geographical distribu- 6 references in Godron's work Sur l'Espèce , ' it seems that Bory St. Vincent , Burdach , Poiret , and Fries , have all admitted that new species are continually being produced . I may add , that of the ...
3 페이지
... laws of variation . In the five succeeding chap- ters , the most apparent and gravest difficulties in accepting the theory will be given : namely , first , the difficulties of transitions , or how a simple being or a simple organ can be ...
... laws of variation . In the five succeeding chap- ters , the most apparent and gravest difficulties in accepting the theory will be given : namely , first , the difficulties of transitions , or how a simple being or a simple organ can be ...
7 페이지
... laws are which determine the reproduction of animals under confinement , I may mention that carnivorous animals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plantigrades or ...
... laws are which determine the reproduction of animals under confinement , I may mention that carnivorous animals , even from the tropics , breed in this country pretty freely under confinement , with the exception of the plantigrades or ...
8 페이지
... laws regulate variation , some few of which can be dimly seen , and will hereafter be briefly discussed . I will here only allude to what may be called correlated variation . Important changes in the embryo or larva will probably entail ...
... laws regulate variation , some few of which can be dimly seen , and will hereafter be briefly discussed . I will here only allude to what may be called correlated variation . Important changes in the embryo or larva will probably entail ...
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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