AGRICULTURE WITH CHEMISTRY. 79 



electirive attra(5\:ions, especially if the neutral salts, used 

 for that purpose, are superacidulatecL 



Oxalat of lime is decomposed by (ire ; the acid is de- 

 stroyed, and carbonic acid, or fixable air, is formed, and 

 disengaged^ 



OXALAT OF MAGNESIA.. 



This is a soluble salt, and, when not superacidulated, 

 promotes vegetation. It is formed, by adding magnesia, 

 or earthy matters, containing magnesia, to the juice, 

 or salt of sorel ; the superabundant acid of which will 

 combine with the magnesia. It is probable, that that 

 part of the juice of sorel, which is in a neutral state, will 

 be decomposed by the greater affinity that magnesia has 

 to the sorelinc or oxalic acid ; and that the vegetable 

 alkali will be disengaged in a mild state, in the same 

 manner as if calcareous matter, or chalk, had been used^ 



OXALAT 



