The Origin of Species by Means of Natural Selection: Or the Preservation of Favored Races in the Struggle for LifeD. Appleton, 1904 - 435 páginas |
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Página 4
... effects of external conditions , or of habit , or of the volition of the plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification and co- adaptation . At the commencement of my ...
... effects of external conditions , or of habit , or of the volition of the plant itself . It is , therefore , of the highest importance to gain a clear insight into the means of modification and co- adaptation . At the commencement of my ...
Página 7
... Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more ...
... Effects of Habit and the use or disuse of Parts - Correlated Variation - Inheritance - Character of Do- mestic Varieties - Difficulty of distinguishing between Varieties and Species - Origin of Domestic Varieties from one or more ...
Página 8
... effects on the offspring are either definite or indefinite . They may be considered as defi- nite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same ...
... effects on the offspring are either definite or indefinite . They may be considered as defi- nite when all or nearly all the offspring of individuals exposed to certain conditions during several generations are modified in the same ...
Página 9
... of structure , whether extremely slight or strongly marked , which appear amongst many individuals living together , may be considered as the indefinite effects of the conditions of life on CHAP . I. ] VARIATION UNDER DOMESTICATION .
... of structure , whether extremely slight or strongly marked , which appear amongst many individuals living together , may be considered as the indefinite effects of the conditions of life on CHAP . I. ] VARIATION UNDER DOMESTICATION .
Página 10
... effects of the conditions of life on each individual organism , in nearly the same manner as the chill affects different men in an indefinite manner , ac- cording to their state of body or constitution , causing coughs or colds ...
... effects of the conditions of life on each individual organism , in nearly the same manner as the chill affects different men in an indefinite manner , ac- cording to their state of body or constitution , causing coughs or colds ...
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Términos y frases comunes
adapted affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common continent crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids important individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living males mammals manner marsupials migration modified descendants natural selection naturalists nearly nest occasionally offspring organisation organs parent peculiar perfect pigeon pistil pollen present principle probably produced progenitor quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed swimbladder tend theory tion trees variability variations varieties vary whilst whole wings young