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 xxiv
... intermediate graduated forms . " Thus living plants and animals are not separated from the extinct by new creations , but are to be regarded as their descendants through contin- ued reproduction . " A well - known French botanist , M ...
... intermediate graduated forms . " Thus living plants and animals are not separated from the extinct by new creations , but are to be regarded as their descendants through contin- ued reproduction . " A well - known French botanist , M ...
Página 23
... intermediate between their parents ; and if we account for our several domestic races by this process , we must admit the former existence of the most extreme forms , as the Italian greyhound , bloodhound , bull - dog , & c . , in the ...
... intermediate between their parents ; and if we account for our several domestic races by this process , we must admit the former existence of the most extreme forms , as the Italian greyhound , bloodhound , bull - dog , & c . , in the ...
Página 33
... intermediate links in the long lines of descent , yet admit that many of our domestic races are descended from the same parents - may they not learn a lesson of caution , when they deride the idea of species in a state of nature being ...
... intermediate links in the long lines of descent , yet admit that many of our domestic races are descended from the same parents - may they not learn a lesson of caution , when they deride the idea of species in a state of nature being ...
Página 55
... intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans : thus , the male of a Tanais regularly occurs under two distinct forms ; one of these has strong ...
... intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans : thus , the male of a Tanais regularly occurs under two distinct forms ; one of these has strong ...
Página 56
... intermediate links , and the extreme links of the chain closely resemble the two forms of an allied dimorphic species inhabiting an- other part of the Malay archipelago . Thus also with ants , the several worker - castes are generally ...
... intermediate links , and the extreme links of the chain closely resemble the two forms of an allied dimorphic species inhabiting an- other part of the Malay archipelago . Thus also with ants , the several worker - castes are generally ...
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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