C 57 ] 



g. By adding a foiution of ponderous earth 

 in marine acid to this water, white clouds will 

 be inftantly formed, and a white precipitate be 

 gradually depofited (defcribed page 49. a.) The 

 magnefia combines with the marine acid, forming 

 muriate of magnefia, which remains diffolved in 

 the water. 



h. Or by adding a foiution of nitre of Giver, 

 there will be no precipitate, but the liquor will 

 have an opal appearance, and after fometime a 

 reddifh one, depohting at laft a precipitate of this 

 colour. The magnefia, combining with the ma- 

 rine acid, remains diffolved. The filver, com- 

 bining with the vitriolic acid, forms this preci- 

 pitate as defcribed (page 49. b.) 



i. The foiution of nitre of mercury produces 

 yellowifh clouds, and by degrees a precipitate of 

 the fame colour, which is turbeth mineral (page 

 51. b.) The magnefia, uniting with the nitrous 

 acid forms nitrate of magnefia i which remains 

 diffolved in the water. 



k. If a foiution of fugar of lead be employ- 

 ed, a white precipitate, vitriol of lead, will be 

 immediately formed by the lead uniting with the 

 vitriolic acid. The magnefia unites with the acet- 

 ous acid, and remains diffolved. 



100 Grains of vitriol of lead contains 28 grains 

 4)f vitriolic acid. 



h Highly rectified fpirits of wine produces a. 

 turbid mixture, and by degrees fmall cryftals of 

 Epfom fait will be formed at the bottom of the 

 veffel. 



m. A foiution of blue vitriol being employ- 

 ed A produces clouds of a pale green colour, and 



I after 



