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been examined, and their infufficiency pointed out by examples, 

 which may be confidered as what philofophers call experimenta 

 cnicis ; experiments of that decifive kind whofe refult not only 

 correfponds to the caufe affigned, but proves that fome other 

 caufe before afligned is not adequate to the explication of the 

 effedl. Each of thefe opinions however, though fingly infuffi- 

 cient, appears, from the inftances alleged by its author, to have 

 been founded in nature, and therefore, by a kind of indiiSiion^ 

 they have been colleded into one fyftem, which has, in the laft 

 place, been applied to the folution of more doubtful phcemntena 

 of tafte. Scientific demonftration cannot be applied, but advan- 

 tage may arife from the regularity of fcientific method. 



