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to. 



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Cii. 



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I.] 



COERELATION OF GEOWTII 



315 



almost 



In the next chapter^ when we 



Natural 



in what way the varieties of wild species may be supposed 

 to have departed so far in the course of ages from the parent 

 stock and from each other as to be incapable of being crossed, 

 notwithstanding the fact which seems directly opposed to 



indi- 



snch a result, that a slight amount of variation in 

 viduals of the same species when they are intermarried in- 

 fuses fresh uigour and increased fertility into the offspiing. 



lie sane 



odut ! : 



different 

 nice and 



mid- 

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« of tie 



instincts 



ductive 



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