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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... Causes of the sterility of first crosses and of hybrids -Parallelism between the effects of changed conditions of life and of crossing - Dimorphism and trimorphism - Fertility of varieties when crossed and of their mongrel offspring not ...
... Causes of the sterility of first crosses and of hybrids -Parallelism between the effects of changed conditions of life and of crossing - Dimorphism and trimorphism - Fertility of varieties when crossed and of their mongrel offspring not ...
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... Causes of the general belief in the immutability of species - How far the theory of Natural Selection may be ex- tended - Effects of its adoption on the study of Natural History -Concluding remarks GLOSSARY OF SCIENTIFIC TERMS INDEX ...
... Causes of the general belief in the immutability of species - How far the theory of Natural Selection may be ex- tended - Effects of its adoption on the study of Natural History -Concluding remarks GLOSSARY OF SCIENTIFIC TERMS INDEX ...
Página 1
... Causes of the sterility of first crosses and of hybrids -Parallelism between the effects of changed conditions of life and of crossing - Dimorphism and trimorphism - Fertility of varieties when crossed and of their mongrel offspring not ...
... Causes of the sterility of first crosses and of hybrids -Parallelism between the effects of changed conditions of life and of crossing - Dimorphism and trimorphism - Fertility of varieties when crossed and of their mongrel offspring not ...
Página 2
... cause of the sterility , which is common to the two cases , has to be considered . The distinction probably has been slurred over , owing to the sterility in both cases being looked on as a special en- dowment , beyond the province of ...
... cause of the sterility , which is common to the two cases , has to be considered . The distinction probably has been slurred over , owing to the sterility in both cases being looked on as a special en- dowment , beyond the province of ...
Página 3
... causes of serious error here intervene : a plant , to be hybridised , must be castrated , and , what is often more important , must be secluded in order to prevent pollen being brought to it by insects from other plants . Nearly all the ...
... causes of serious error here intervene : a plant , to be hybridised , must be castrated , and , what is often more important , must be secluded in order to prevent pollen being brought to it by insects from other plants . Nearly all the ...
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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