Analysis of a Magnetic Iron Pyrites. — 221 
with ammonia in great excess, by which a small portion of ses- 
quioxyd of iron precipitated, which was separated by filtration. 
The filtered ammoniacal solution was then mixed in a capsule 
with carbonate of soda in excess, evaporated to dryness and 
heated till it changed its color. It was then re-dissolved in. boil- 
ing water and filtered. The filtered solution contained no trace 
of nickel. The precipitate was washed, dried, incinerated and 
weighed, yielding monoxyd of nickel 0:287 grammes or 5-74 per 
cent. equivalent to 4:517 per cent. metallic nickel. The oxyd of 
nickel contained neither cobalt nor manganese. 
ret of nickel ($ 12) but amounted to no appreciable quantity. 
14. The filtered solution ($ 13) indicated by the addition of 
ammonia and oxalate of ammonia only a trace of lime. After 
filtration the addition of phosphate of soda caused no precipitate. 
5. To determine the quantity of sulphur, one gramme of the 
finely pulverized ore was mixed with five grammes of nitre and 
he same amount of carbonate of soda and heated to beginning 
i ucible. The mass was digested wit 
fusion in a platinum crucible. 
