318 



An Analysis of Flate-Glass. 



the glass to be exceedingly slow when covered merely with 

 water ; it was then suggested to us by Dr Hofmann to try, 

 instead of water, a strong solution of ammonia ; we found 

 that the hydrofluoric acid being much more rapidly absorbed 

 by this latter agent, the decomposition was facilitated in a 

 remarkable manner. 



The first of the two following Tables shews the amount of 

 substance employed ; the results obtained are exhibited in 

 Table II. 



Table I. 



Table II. 



* These numbers were obtained in an indirect determination of the alkalies. 





