On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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... climate and of the level of the land , and by occasional means — Dispersal during the Glacial period -Alternate Glacial periods in the North and South • 129 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh ...
... climate and of the level of the land , and by occasional means — Dispersal during the Glacial period -Alternate Glacial periods in the North and South • 129 CHAPTER XIII . GEOGRAPHICAL DISTRIBUTION - continued . Distribution of fresh ...
14 ÆäÀÌÁö
... climates , can often be crossed with ease . By a reciprocal cross between two species , I mean the case , for instance , of a female - ass being first crossed by a stallion , and then a mare by a male - ass ; these two species may then ...
... climates , can often be crossed with ease . By a reciprocal cross between two species , I mean the case , for instance , of a female - ass being first crossed by a stallion , and then a mare by a male - ass ; these two species may then ...
18 ÆäÀÌÁö
... climates , do not always prevent the two grafting together . As in hybridisation , so with grafting , the capacity is limited by systematic affinity , for no one has been able to graft together trees belonging to quite distinct families ...
... climates , do not always prevent the two grafting together . As in hybridisation , so with grafting , the capacity is limited by systematic affinity , for no one has been able to graft together trees belonging to quite distinct families ...
27 ÆäÀÌÁö
... climate to another , and back again . During the con- valescence of animals , great benefit is derived from al- most any change in their habits of life . Again , both with plants and animals , there is the clearest evidence that a cross ...
... climate to another , and back again . During the con- valescence of animals , great benefit is derived from al- most any change in their habits of life . Again , both with plants and animals , there is the clearest evidence that a cross ...
48 ÆäÀÌÁö
... climate , and , therefore , that the really govern- ing conditions of life do not graduate away quite insen- sibly like heat or moisture . I endeavoured , also , to show that intermediate varieties , from existing in lesser numbers 48 ...
... climate , and , therefore , that the really govern- ing conditions of life do not graduate away quite insen- sibly like heat or moisture . I endeavoured , also , to show that intermediate varieties , from existing in lesser numbers 48 ...
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admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larv©¡ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings