C 50 ] 



acid, combining with the natron, remains diffolv- 

 ed in the water. 



d. An equal quantity of highly reclined fpirit 

 of wine being added to water containing this fait, 

 the mixture becomes turbid, and by degrees 

 fmall cryftals will be formed at the bottom of the 

 veffel ; the fpirits of wine combining with the 

 water, feparates it from the vitriolated tartar, 

 which is precipitated from it in the form of fmall 

 cryftals. 



4. VITRIOLATED TARTAR. 



Kali combined with vitriolic Acid. 



Synonymous Names. 

 Arcanum duplicatum. 

 Sal de duobus. 



VITRIOLATED 

 TARTAR. 



. Sal polychreftum. 

 - Kali vitriolatum. 

 Nitrum vitriolatum. 

 Sulphate of potalh. 



It has a bitterifh tafte, fufTers no alteration 

 from expofure to the air ; the form of its cryftals 

 varies much, according to circumftances under 

 which they are prepared ; they are moftly fix 

 lided pyramids, fometimes fix fided prifms, like 

 rock cryftals : they are fmall compared with the 

 foregoing. 



This fait is rarely found in mineral waters. 



a. By adding a folution of muriated ponder- 

 ous earth to water containing this fait, the fame 

 appearances take place as defcribed (49 a.) while 



the 



