ART. 2. — M. MATSÜI : 



found them all to have a composition corresponding to the formula 

 Fe(00C.CH,.C00M)3. 



Sodium ferri-malonate. 



To a solution of sodium malonate, ferric chloride was added 

 drop by drop as long as a portion of the mixed solution did 

 not give a red colour to potassium thiocyanate. The solution 

 was then concentrated on a water-bath and cooled, when greenish 

 sandy crystals separated out. The crystals were quickly washed 

 with water and dried between folds of filter-paper. 



To ascertain whether it contained any water of crystallization 

 a portion of the salt was heated in an air-bath at 140° for 4 

 hours ; no loss of weight having been observed, the temperature 

 of the bath was raised first to 160° and then to 200°, at which 

 temperature the substance began to decompose, but the weight was 

 found still constant. The iron was weighed as ferric oxide, and 

 the sodium as sodium carbonate. The results were as follows : 



Sodium 16-04 — — 16-19. 



The salt may be formulated as 



.000 . CH2 . COO Na 

 Fe— OOC.CHg.COONa 

 \oOC.CH2.COONa, 



which in the aqueous solution dissociates into sodium ion and 

 ferri-malonic acid ion. 



