ON A NATURAL SYSTEM 



"but which can be fcarccly fo perfectly faturatcd, 

 as that there fliould not be fume finull excels of 

 acid. 



{ cxxvi. Metallic Saltf, ivitb an Excefs of the 

 metallic Baft. 



THERE are fomc inflances alfo of the union 

 of metals and acids, highly deferving of notice, 

 iu which tlie exccfs is on the part of the metal. 

 To this head we refer the turpith mineral, .and 

 red precipitate of Mercury, v/hich though ever 

 fo well waihed, yield a finall quantity of a- 

 cid on dillillation. The fame remark applies 

 equally well to the pulvis algarothi. Mercurius 

 dulcis retains its metal partly calcined and part- 

 ly perfect*; and nitiatcd lilver, in like manner 

 can take up a portion of lilver, without dcphlo- 

 gitlicuting it. Muriatcd copper, deficient in its 

 iicid, couiiitutcs a peculiar fait hitherto unclif- 

 cribcd. 



J c\\vn. Triple metallic Suits. 



WH hp.vc long been acquainted with a con- 

 fiderable number of metallic triple falts, that 

 are nut feparable but by dccompoiiiion. Of 

 this ddcription are tlie combinations of tartar 

 with iron and antimony ; of the vitriolated ve- 

 getable 



^ Schcclc iu Adis Stockh. 



