FLUORIC ACID. 173 



(4.) These experiments show decidedly that 

 the atomic weight of fluoric acid is 1-25. It is 

 obvious, therefore, that the true constituents of 

 fluatc of barytes are 



Fluoric acid 06818 

 Barytes 5-3182 



6-0000 

 instead of 



Fluoric acid 0-733 



Barytes 5-26? 



6-000 



the proportions found by Berzelius, owing pro- 

 bably to a little silica existing in his fluate of 

 barytes. 



It is equally obvious, that the true composi- 

 tion of fluate of lime is 



Fluoric acid 26-3158 

 Lime 73-6842 



100-0000 



which approaches nearest to the analysis of Sir 

 H. Davy. I made some experiments with fluor 

 spar in the same way as Berzelius j but they did 

 not agree with each other so closely as to induce 

 me to put much confidence in their accuracy. 

 Indeed, unless we were assured before hand of 

 the perfect purity of the fluor spar employed, 



