J 9 OF THE ASBESTINE EARTH. 



effcrvcfcencc with the fait of foda ; diflblves 

 with borax, but not with the nticrocofmic fait. 



EXP. 16. 100 Ib. of it being reduced to a 

 fine powder, were boiled in 1200 Ib. of aqua re- 

 gia. To the folution filtrated, and concentrat- 

 ed by evaporation, vitriolic acid was added, but 

 no muddinefs appeared in it, nor was any gyp- 

 fum depofitcd, although the evaporation was 

 carried farther. But that it might not efeape 

 by being (Defended by the iilicious earth, as 

 much vitriolic acid was poured into the fulutiun 

 as would be more than iuiiicient to take up the 

 foluble eartlis ; and the whole was then evapo- 

 rated to dry nets. 



Being afterwards thoroughly wafhed in wa- 

 ter, there Hill remained a reiiduum of iiliccous 

 earth equal to 80. 



Phlogiflicated alkali diilurbed the liquor, and 

 produced 4 of Prufllan blue; which anfvvcrs to 

 0.9 of calx of iron. 



The remainder, when filtrated was found tot 

 contain magnolia. But that it might be afcer- 

 tained whether it held any argillaceous earth, a 

 precipitation of 4 was obtained by means of the 

 aerated magncfia; and it was obfervcd, that the 

 greatcil part of the precipitate fell before the ex- 

 ,cefs of acid was completely deflroyed. The fedi- 

 raent was faturatcd exadly with vitriolic acid; and 



the 



