70 BULLETIN 42, UNITED STATES NATIONAL MUSEUM. 



Final jyt'oducls. 



(1) Slag, from the beartli smelting. (5.5174.) 



The analysis of this material presented unusual difiiculties. Several attempts were 

 made upon it without entirely satisfactory results. The figures given are the results 

 of a very careful examination, and are given as obtained, without insisting too much 

 that they represent the actual arrangement of the several bodies. A small amount 

 of coal remained adhering to the slag, but it was not submitted to combustion. The 

 analysis by the v/riter gave : 



Residue insohihle in nitric acid. 



Per cent. Per cent. 



Silica (SiO.) 1.97 



Sulphate of lead (PbS04) 0.24 



Sesquioxido of iron (FciOn) 1. 67 



Alumina (AljOs) 0.21 



Oxide of zinc (ZuO) 0.57 4. G6 



Sulphate of lead (PbS04) 4.94 



Acetic acid solulioii. 



Silica (SiOj) 10.73 



Oxide of lead (PbO) :{:?. 55 



Sesqnioxide of iron (Fe.jOs) 1.23 



Alumina (Al^Os) 0.57 



Oxide of zinc (ZnO) 13.96 



L]me(CaO) 11.49 



Magnesia (MgO)'. 0.12 71.65 



Nitric acid solution. 



Sulphide of lead (PbS) 14.73 



Sulphide of iron (FeS.) 0. 67 



Sulphide of zinc (ZnS) 3.64 19.04 



100. 29 

 Sulphurous acid (SO2) was not present in weighable amounts. 



(2) Pig lead, from the hearth smelting. (55172.) 



Analyzed by the writer it showed : 



Per cent. 



Arsenic (As) ^ 0.00011 



Antimony (Sb) 0.00146 



Silver (Ag) 0.00056 



Copper (Cu; 0.01782 



Bismuth (Bi) trace. 



Cadmium (Cd) trace. 



Nickel (Ni) 0.00077 



Cobalt (Co) 0.00005 



Iron (Fe) 0. 00G86 



Zinc(Zn) 0.00033 



SLAG EYE SMELTING. 



Ore. 



(t) Ceru8.site, called dry bone. (.55176.) 



Fuel. 



(1) Coke, from Connellsville, Pennsylvania. (55173.) 



(2) Charcoal, used in the lead basin of the slag eye in refining the lead. (55177.) 



