The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1898 |
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Página 36
... similar conditions long - continued should likewise induce this tendency ; though in certain cases , with species having a peculiar constitution , sterility might occasionally be thus caused . Thus , as I believe , we can understand why ...
... similar conditions long - continued should likewise induce this tendency ; though in certain cases , with species having a peculiar constitution , sterility might occasionally be thus caused . Thus , as I believe , we can understand why ...
Página 41
... similar in all respects to the parent - form . Now hy- brids in the first generation are descended from spe- cies ( excluding those long - cultivated ) which have not had their reproductive systems in any way affected , and they are not ...
... similar in all respects to the parent - form . Now hy- brids in the first generation are descended from spe- cies ( excluding those long - cultivated ) which have not had their reproductive systems in any way affected , and they are not ...
Página 90
... similar fact , for an existing crocodile is associated with many lost mammals and reptiles in the sub - Himalayan deposits . The Silurian Lingula differs but little from the living species of this genus ; whereas most of the other ...
... similar fact , for an existing crocodile is associated with many lost mammals and reptiles in the sub - Himalayan deposits . The Silurian Lingula differs but little from the living species of this genus ; whereas most of the other ...
Página 91
... similar rela- tions between the existing inhabitants of distinct coun- tries ; for instance , the land - shells and coleopterous in- sects of Maderia have come to differ considerably from their nearest allies on the continent of Europe ...
... similar rela- tions between the existing inhabitants of distinct coun- tries ; for instance , the land - shells and coleopterous in- sects of Maderia have come to differ considerably from their nearest allies on the continent of Europe ...
Página 101
... similar parallelism in the forms of life has been ob- served by several authors ; so it is , according to Lyell , with the European and North American tertiary de- posits . Even if the few fossil species which are com- mon to the Old ...
... similar parallelism in the forms of life has been ob- served by several authors ; so it is , according to Lyell , with the European and North American tertiary de- posits . Even if the few fossil species which are com- mon to the Old ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied 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 inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation palæontologists Palæozoic parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst whole widely different wings