292 Messrs. Jackson and Alger on the 
The sandstone, continuing its eastward course through the 
district of Pictou, approximates to the slate of the South moun- 
which was the sulphur extricated from the ore. When cool, the contents of the 
matrass, being diluted with pure water, and carefully washed from its surface, were 
thrown on a filter of known weight. The precipitate collected on its surface, wash- 
ed with dilute nitric acid, and afterwards with water, being dried, was found to weigh 
thirty eight grains. This was ignited in a crucible of platinum over an alchohol 
lamp, and burned away, leaving two grains ofa dark grey powder, which was a 
portion of the ore that had escaped decomposition. This was treated with nitro- 
muriatic acid, and being dissolved by it, was added to the filtered solution. The 
sulphur then in two hundred grains amounts to thirty-six grains, or eighteen per 
cent. 
C. The liquid which had passed the filter was of a bluish-green color, and 
transparent. It was divided into two equal quantities. In one portion a polished 
cylinder of iron was immersed, and in forty-eight hours the copper had precipitat- 
ed upon it in a dendritic form. That it had entirely separated the copper was 
known by the solution ceasing to give a tarnish of copper to a polished steel in- 
strument. The copper removed from the cylinder of iron, washed and dried rapidly 
to prevent oxidation, was found to weigh 79.5 grains. 
D. The other half of the solution was treated with aqua ammoniz to excess of 
saturation, when a muddy brown precipitate took place, which, when collected on a 
double filter of known weight, washed, dried, and ignited with a little wax in a 
platinum crucible, was reduced to the protoxide of iron attractable by the magnet, 
and weighed 3.4 grains, indicating 2.5 grains of metallic iron. 
E, To determine whether the solution was equally divided, and to prove the 
correctness of the process C., the ammoniated solution was saturated and acidulat- 
ed with sulphuric acid, and a plate of polished iron was immersed in it. The copper 
precipitated in a brilliant metallic coating, and when separated, washed, and dried, 
weighed with the loss of a trifling fraction, like the result of the former process, 
79.5 grains. 
This ore contains, then, in a hundred parts, 
Copper, - cn being - See AOP- (C) 79.5 
Sulphur, = Bae SANS DEQ: Ba eee. eye arom (Ea) 18.0 
Iron, - - - - - - - - (D) 2.5 
100.0 
