BORON. 161 



of fluoboric acid gas is 2-361 i, which differs less 

 than Wooth part from the specific gravity which 

 I actually obtained. 



3. 4'&5, then, is the atomic weight of fluoboric ^ t s io c n ompo ~ 

 acid, and 1-25 is the atomic weight of fluoric 

 acid ; consequently fluoboric acid is a compound 

 of 



Fluoric acid 1-25 

 Boracic acid 3-00 



4-25 



3, then, is the weight of an atom of boracic acid ; 

 for Davy's experiments on the composition of 

 boracic acid Berzelius' analysis of borate of 

 ammonia and mine of borax preclude the pos- 

 sibility of either more or less than an atom of 

 boracic acid being united in fluoboric acid, with 

 an atom of fluoric acid. 



From Davy's analytical experiments, it is Atomof 



* * boron and 



clear, that the atom of boron is 1 j and that bo- 

 racic acid is a compound of 



1 atom boron 1 



2 atoms oxygen 2 



4. It occurred to me, that, by heating together Ratio be- 

 anhydrous boracic acid and dry carbonate of weights of 

 potash, some light might be thrown on the c^nic^ 

 atomic weight of boracic acid, by the quantity acids * 



VOL. I. L 



