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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... explained by variations not super- vening at an early age , and being inherited at a correspond- ing age - RUDIMENTARY ORGANS ; their origin explained - Sum- mary . Page 202 CHAPTER XV . RECAPITULATION AND CONCLUSION . Recapitulation of ...
... explained by variations not super- vening at an early age , and being inherited at a correspond- ing age - RUDIMENTARY ORGANS ; their origin explained - Sum- mary . Page 202 CHAPTER XV . RECAPITULATION AND CONCLUSION . Recapitulation of ...
Página 26
... explained , of too close interbreeding . The above view of the sterility of hybrids being caused by two constitutions being com- pounded into one has been strongly maintained by Max Wichura . It must , however , be owned that we cannot.
... explained , of too close interbreeding . The above view of the sterility of hybrids being caused by two constitutions being com- pounded into one has been strongly maintained by Max Wichura . It must , however , be owned that we cannot.
Página 65
... explained , for the formation of new varieties and species ; but during such periods there will generally be a blank in the geological record . On the other hand , during subsidence , the inhabited area and number of inhabitants will ...
... explained , for the formation of new varieties and species ; but during such periods there will generally be a blank in the geological record . On the other hand , during subsidence , the inhabited area and number of inhabitants will ...
Página 70
... explained , that A might be the actual progenitor of B and C , and yet would not necessarily be strictly intermediate between them in all respects . So that we might obtain. 70 ABSENCE OF INTERMEDIATE VARIETIES [ CHAP . X.
... explained , that A might be the actual progenitor of B and C , and yet would not necessarily be strictly intermediate between them in all respects . So that we might obtain. 70 ABSENCE OF INTERMEDIATE VARIETIES [ CHAP . X.
Página 91
... explained in a former chapter . When many of the inhabitants of any area have become modified and im- proved , we can understand , on the principle of compe- tition , and from the all - important relations of organ- ism to organism in ...
... explained in a former chapter . When many of the inhabitants of any area have become modified and im- proved , we can understand , on the principle of compe- tition , and from the all - important relations of organ- ism to organism in ...
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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