THE COMPLEX FERRI-MALONATES. 5 



been isolated, but its existence in the aqueous solution is certain, 

 as a green solution is produced by dissolving moist ferric hydroxide 

 to saturation in a warm solution of malonic acid, and this green 

 solution gives the above mentioned salts on neutralization. 



It should here be mentioned that ferrous iron also forms 

 the complex malonates, which are precipitated as yellowish crystals 

 from a mixed solution of a malonate and ferrous sulphate on 

 the addition of absolute alcohol. They are all very unstable, 

 changing immediately in open air into the corresponding ferri- 

 malonate. 



Cliemical Institute, Kyoto Imperial University, 

 June, 1907. 



