163 
TABLE 1. 
Pyrites. 
Arsenic 
per Cent. 
Pyrites. 
Number 
of 
Analyses 
made. 
Arsenic 
per Cent. 
Spanish 
Belgian 
Westphalian... 
Norwegian ... 
0-21 to 0-31 
Trace. 
Trace. 
None. 
c . , ( Mason’s 
Spanish | TharsU 
Belgian 
Westphalian 
at • f Hard 
Norwegian [ goft 
10 
10 
8 
8 
8 
8 
1-7453. 
1-6517. 
0- 9437. 
1- 8783. 
1-6490. 
1-7085. 
TABLE II. 
Substance in which Arsenic is found. 
Number of 
Analyses 
Arsenic per 
cent. 
Pyrites before burning 
8 
1-649 
,, after „ 
4 
0-465 
Sulphuric Acid 
15 
1051 
Deposit in flue leading from Pyrites kiln 1 
4 
46-360 
to Lead chamber j 
Deposit on bottom of Lead chamber 
5 
1-857 
Hydrochloric Acid 
8 
0-691 
Sulphate of Soda 
15 
0-029 
Soda waste 
6 
0-442 
Carbonate of Soda 
12 
Recovered Sulphur (Morid’s process) 1 
4 
0-700 
before purification began J 
Morid’s process, latest methods 
2 
0-000 
The Pyrites used for analysis in Table II. was the hard 
Norwegian, and this, as may he seen in Table I. comes next 
in order in freedom from arsenic to the Belgian. The Bel- 
gian itself was put aside owing to the fact that it made 
too much “ smalls” in breaking for the kilns, which became 
an expense as well as inconvenience. 
TABLE III. 
Tons As. 
100 tons hard Norwegian Pyrites (Table I) contain 
before burning 1 -649 
„ „ after burning 0-465 
100 tons hard Norwegian Pyrites make 140 - 875 tons 
H 2 S0 4 containing 1 *48 1 
140-875 tons Sulphuric Acid make 104-9 tons HC1 
containing 0-724 
140-875 tons Sulphuric Acid make 204-12 tons 
Na 2 S0 4 containing 0'059 
