On the Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeEaston Press, 1976 - 470 páginas |
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Página 33
... distinct forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans : thus , the male of the Tanais regularly occurs under two distinct ...
... distinct forms , not connected by intermediate varieties . Fritz Müller has described analogous but more extraordinary cases with the males of certain Brazilian Crustaceans : thus , the male of the Tanais regularly occurs under two distinct ...
Página 76
... distinct individual being advantageous or indispensable ! If several varieties of the cabbage , radish , onion , and ... distinct variety having a prepotent effect over the flower's own pollen ; and that this is part of the general law ...
... distinct individual being advantageous or indispensable ! If several varieties of the cabbage , radish , onion , and ... distinct variety having a prepotent effect over the flower's own pollen ; and that this is part of the general law ...
Página 389
... distinct classes have often been adapted by successive slight modifications to live under nearly similar circumstances , -to inhabit , for instance , the three elements of land , air , and water , - we can perhaps understand how it is ...
... distinct classes have often been adapted by successive slight modifications to live under nearly similar circumstances , -to inhabit , for instance , the three elements of land , air , and water , - we can perhaps understand how it is ...
Contenido
VARIATION UNDER NATURE | 30 |
STRUGGLE FOR EXISTENCE | 45 |
NATURAL SELECTION | 59 |
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Términos y frases comunes
accumulated adapted admit affinities allied species America ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour common progenitor continuous crossed crustaceans degree developed difficulty distinct species divergence doubt effects eggs embryo existing exterminated extinct extremely facts favourable fertilised fertility flowers formation forms fossil Fritz Müller genera genus geological geological period gradations greater number groups of species habits Hence hybrids hybrids produced 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 offspring organisation organs Origin of Species parent peculiar perfect pigeons pistil plants pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds slight South America stamens sterility structure struggle successive supposed swimbladder theory variability variations varieties vary whilst whole wings young