PHYSICAL AND LITERARY. 165 



acids of vitriol, nitre, and of common fait, 

 and by diftilled vinegar ; the neutral faline 

 liquors thcDce produced having each their 

 peculiar properties. 



That vyhich is qiade with the vitriolic 

 ^cid, may be condenfed intp cryftais jirniiar 

 jn all refpe(^5 to epfom-falf;iif yvfrl c ■} akuij 



That vvhich is made with thp nitrous 

 j.s of a yellow colour, and yields faline 

 cryftals, which retain their form in a very 

 dry air, but melt in a moift one. 



That which is produced by means of 

 fpirit of fait, yields no cryftals > and if eva- 

 porated to drynefs, foon melts again when txk 

 pofed to the air. 



That which is obtained from the union 

 of diflilled vinegar with magnejia^ affords no 

 cryftals by evaporation, but is condenfed 

 into a faline mafs, which, while warm, is 

 extremely tough and vifcid, very much re- 

 fembling a ftrong glue both in colour and 

 conHftence, and becomes brittle when cold. 



By thefe experiments viagnefia appears to 

 be a fnhftance very different from thofe of 

 the calcarious clafs ; under which I would 

 be underftood to comprehend all thofe that 

 ar^ converted into a perfect quick-lime in a 



flrong 



