AGRICULTURE \VITH CHEMISTRY. 77 



PHOSPHAT OF IRON 



Is to be decomposed by alkaline salts and mag- 

 nesia. 



OXALAT OF LIME. 



OxALAT of lime is a very insoluble saline compound, 

 formed by the combination of calcareous matter with 

 the oxalic, or soreline acid, with which acid calcareoiis 

 matter has a greater arfinity than have alkaline salts. 

 The oxalic acid, or acid of sorcl, is found in the plant 

 of the same name, combined with the vegetable alkali, 

 in the state of a superacidulated salt ; and it is likewise 

 containeil in many other vegetables. Oxalat of lime is 

 to be produced, b" adding calcareous matter to the ex- 

 pressed juice, or salt of sorcl. The calcareous matter 

 will combine M'ith the acid, and form oxalat of lime ; 



whilst 



