ON FLUOR 



SECTION XIII. 



I distilled one part of powdered fluor with two parts of 

 concentrated nitrous acid, one part of which went over, 

 together with the fluor acid, and upon the water of the 

 receiver there was a thick crust formed. The mass remain- 

 ing in the retort was calcareous earth, saturated with nitrous 

 acid, of a porous texture and reddish colour, which attracted 

 moisture from the atmosphere. 



SECTION XIV. 



Two parts of concentrated muriatic acid being distilled 

 with one part of the spar, the fluor acid passed over into the 

 receiver with a large quantity of the muriatic. The internal 

 surface of the receiver, as well as the surface of the water 

 contained in it, was covered with a white crust. The 

 residuum in the retort was reddish, attracted moisture from 

 the air, and exhibited the properties of muriated lime (fixed 

 sal ammoniac). 



SECTION XV. 



If there had appeared no siliceous earth, except when 

 vitriolic acid was employed for expelling the fluor acid, it 

 might seem as if this earth owed its generation to the 

 vitriolic acid. (Becher and Stahl pretend that acid of 

 vitriol contains siliceous earth.) The fluor acid, reduced 

 into vapours, might be supposed, in this case, to deprive the 

 vitriolic acid of this earth, and to lose that power again in 

 proportion as its vapours are condensed and unite with 



