DURING THE MIDDLE AGE. i$t 



of Sal miralrilc Glauber i. Of the Alkali min. 

 nitratum there is no account, and the brine 

 mentioned by Pliny was properly common 

 Salt. Borax is mentioned by Gcber. The vi- 

 triolatcd volatile Alkali, invented by Glauber, 

 was called Sal fccrctus. Of the Alkali vciat. 

 nitratum they fcem to have had no knowledge, 

 though Sal Ammoniac was difcovcrcd long be- 

 fore the beginning of our period. The Alkali 

 I'cg. acetatum is celebrated for its many virtues 

 by Pliny, though it was afterwards Hill more 

 extolled by Mullcr, under the name of Terra 

 foliata fecretijjima. Crollius makes mention of 

 the Salt of Amber, and Bartholetus of the Su- 

 gar of Milk. The Sal Scignctti was prepared at 

 Rochelle very near fifty years before its compo- 

 fition was generally known. 



Among the middle falts, with bafes of earth, 

 they were acquainted with few except Alum, 

 although they diilblved corals and pearls in 

 the muriatic or acetous acid. Hollandus gave 

 the name of Sal air.mon. Jixut to muriatic chalk. 



Moil of the metallic falts were known and ex- 

 amined in this period. The combination of 

 iilver and the nitrous acid, under the name of 

 Magijlcrlnm Argcnti, vcl Chryftalli Diana ; and 

 the fame fait rendered cauftic, by being melted 

 in the fire, and called Lapis infernally are dc- 

 fcribed by Angelo Sala. Crollius gave the ap- 

 pellation of Luna cornua to filver and the mu- 

 riatic acid. Mcrcurius fublimatut conofivits is 

 K 4 mentioned 



