INTRODUCTORY OBSERVATIONS. 1xx]l 



important organs, and the difcovery of fads re- 

 fpefting the mental powers. But in all expe- 

 riments and reafoning, it will be found that na- 

 ture purfues a certain determinate courfe ; if there 

 are deviations from it, they are accidental ; and 

 the fame uninterrupted and invariable line will 

 be refumed, whenever the caufe obfi;ru6i;ing it is 

 removed. 



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