i 2 6 A SYSTEM OF 



norance and idlenefs have invented certain terms 

 or expreflions, to avoid giving an account of thofe 

 ores or mineralifations, which are not eafy enough 

 to be decompounded ; for inftance, wild, rapa- 

 aoiis, arfenical, volatile, &c. and fome iron ores 

 in particular have been thus called ; by which 

 means it has happened, that ceconomical reflec- 

 tions have often been added to natural and phi- 

 lofophical defcriptions : and thus others are de- 

 terred from examining many bodies, of which we 

 have got, and ftill retain falfe notions by this way 

 of proceeding. 



The manganefe has by fyflematifts been com- 

 monly ranked among fuch iron ores ; but the 

 artificers who make ufe of it in the manufacture 

 of glafs do not know it ; nor can they by any 

 means be perfuaded to ufe any of the pretended 

 bodies a-kin to it, inftead of the manganefe itfelf, 

 fince experience prevails more with them than 

 fuppofitions. The confumption of the manganefe 

 is but fmall, and therefore it is not a very profit- 

 able article* 



SECT. CXIX. 



The SECOND CLASS. 



The SALTS, Salia. 



By this name thofe mineral bodies are called* 

 which can be difiblved in water, and give it a 

 tafte \ and which have the power, at leaft when 

 they are mixed with one another, to form new 

 bodies of a folid and angular fhape, when the 

 water in which' they are diffolved is diminimcd 

 to a lefs quantity than is required to keep 



them 



