[ i68 ] 



p. 13, and by Butini on Magnefia, p. 149. As to theufe refulting 

 from refearches of this nature it were fuperfluous to attempt to 

 prove it at this day, the recourfe which the moft eminent analyfts 

 have been obliged to have to it in particular inftances, as will pre- 

 fently appear, fufliciently evinces it. " Inquiries of this kind (fays 

 " Mr. Fourcroy) are more difficult and delicate than thofe which 

 *' have hitherto been made on falts ; whatever requires a precifc 

 " knowledge of quantities and proportions, prefents difficulties fo 

 " great as often to appear infurmountable, yet without this know- 

 " ledge no progrefs can now be made in chymiftry," 10 An. Chy. 

 325 ; and according to Bergman, " Ufus cognitae proportionis prin- 

 " cipiorum ingredientium egregius eft et multifarius." i Bergm. 

 137. chap. I. § I. 



TABLE 



