C 7° 3 



ing with the vitriolic acid, and the unguinous 

 part with the earth, forming an earthy foap. 



B. d. The vitriolic acid may be detected by 

 the addition of a folution of muriated ponder- 

 ous earth, white clouds will be inftantly formed, 

 and a white infoluble precipitate, which is an 

 artificial ponderous fpar, will be gradually depo- 

 fited at the bottom of the veffel, as related in 

 other inftances, where vitriolic acid conftitutes 

 one of the elements, (page 49, a.) 



e. By adding the folution of nitre of filver, 

 nitre of mercury, or fugar of lead, to water 

 containing alum, the fame appearances will take 

 place as enumerated (page 49, b. page 57, h. i. k.) 

 the aluminous earth uniting with the acids, in 

 the fame manner as the magnefia in thofe in- 

 ftances. 



f. A little folution of blue vitriol being add- 

 ed, a green precipitate will be formed, with a 

 fmall tinge of blue in it. 



CLASS 



