converting cast into malleablelron. 2% 
there was, besides the plumbago, a small quantity of that diffi- 
cultly soluble calx of iron, which the solutions of this metal 
deposit on long exposure to air. The difference was greater, 
therefore, than it appeared. On the other hand, the long ac- 
tion of the acids might have consumed some plumbago. There 
was little or no calx attractable by the magnet in the resi- 
duums of the fused iron. From the 48 grains of residuum, I 
separated more than six grains by the magnet. 
MDCCXCII. 
Nn 
