4 ABT. 2. — M. MATSUI : 



The water was nearly all expelled by heating the salt at 160° 

 for 5 hours, beyond which no appreciable loss of weight was 

 perceived, though the temperature was raised to 200°, at which 

 temperature the salt was again heated for 4 hours. The potassium 

 was first converted into the carbonate and weighed as the chloride. 

 The above data show that its composition is exactly like that 

 of the sodium salt, except that it contains four molecules of the 

 water of crystallization. 



The potassium salt forms green j)rismatic crystals, and its 

 properties, both chemical and physical, are similar to those of 

 the sodium salt. 



Ammonium ferri-malonate. 



Ammonium ferri-malonate, prepared from ammonium malonate 

 and ferric chloride, closely resembles the potassium salt in colour 

 and crystalline form. Its composition may be formulated as 



X)OC . CH2 . COO NH, 

 Fe-OOC . CHo . COO NH, , 4H,0 

 \00C . CHo . COO NH, 



from the following analytical data : 



I. 0-1630 gram substance gave 0*0234 gram water on 8 hours' 



heating at 160°. 

 IL 0-1228 gram substance gave 0-0193 gram ferric oxide. 



Calculated for Found 



Fe(OOC.CH, .COONHJ3, 4H,0. I. H. 



Water 14-76 14-36 — 



Iron 11-27 — 10-94 



Barium and calcium salts have been obtained but not 

 analysed. 



The complex acid corresponding to these salts has not yet 



