144 



GOOD FROM CROSSING. 



Chap. XVII; 



that evil follows from close interbreeding, and when we bear in 

 mind that throughout the whole organic world elaborate pro- 

 vision has been made for the occasional union of distinct indi- 

 viduals, the existence of a great law of nature is, if not proved 

 at least rendered in the highest degree probable; namely, that 

 the crossing of animals and plants which are not closely related 



each other is highly beneficial or even necessary 



breeding prolonged during 



many g 



is 



highly 





injurious 



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