OF MAGNESIA. . 309 



bonic acid. From these experiments I consider 

 the constituents of the salt to be 



2 atoms oxalic acid 9 



1 atom magnesia 2-5 



7 atoms water 7-875 



19-375 



13. Tartrate of magnesia. This salt, which is Titrate, 

 a white tasteless powder, is composed of 



1 atom tartaric acid 8 '2 5 



1 atom magnesia 2-5 



2 atoms water 2-25 



13 



14-. Bitartrate of magnesia. This salt was Bitartrate. 

 formed by dissolving tartrate of magnesia in tar- 

 taric acid and crystallizing the solution. The 

 bitartrate is deposited in small acicular crystals ; 

 it has a slightly acid taste, and reddens vegeta- 

 ble blues. 20-125 grains of these crystals were 

 kept in a red heat till nothing remained but the 

 magnesia, which weighed 2\5 grains. Hence, 

 the salt is composed of 



2 atoms tartaric acid 16-5 



1 atom magnesia 2*5 



I atom water 1-125 



20-125 



The water of crystallization in the salts of mag- 



U3 



