356 



LAWS OF VARIATION. 



Chap. XXVI. 



two causes analogous varieties often arise. When we reflect 

 on the several foregoing laws, imperfectly as we understand 



them, and when we bear in mind how much remains to be 

 discovered, we need not be surprised at the extremely intricate 

 manner in which our domestic productions have varied, and 

 still go on varying. 



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