394 STOCKS: "COAL BALLS" AND " BAUM POTS." 
examination of the " coal balls " qualitatively I found the following : — 
Ferrous oxide, manganous oxide, alumina, lime, magnesia, silica, 
sulphuric acid, carbonic acid, phosphoric acid, iron pyrites, and 
organic matter ; and in the " baum pot," ferrous oxide, alumina, 
lime, magnesia, sihca, sulphuric acid, chlorine, phosphoric acid, and 
iron pyrites. 
The quantitative estimations give the following figures : — 
Coal Balls. 
Baum Pot. 
Bradsliaw. 
Stock's Pit. 
Swan Bank. 
Ferrous Oxide ... 
3-210 
0-167 
O -0 
Manganous Oxide 
Trace. 
Alumina 
0327 
Trace. 
1-58 
Lime 
36-170 
46-100 
51-79 
Magnesia .. 
0-879 
0-299 
Trace. 
Silica 
1-159 
1-209 
2 05 
Sulphuric Acid 
0151 
0010 
Trace. 
Chlorine ... 
Trace. 
Trace. 
Carbonic Acid 
29-000 
35-280 
40;65 
Phosphoric Acid 
Trace. 
Trace 
0-42 
Iron Pvrites .. 
21-581 
12-168 
016 
Water 
0-309 
3-006 
0-09 
Organic Matter and Loss 
7-214 
1-761 
100-000 
100-000 
10-000 
On looking at the figures of the analyses we find that the 
"baum pot "contains 0*42 per cent of phosphoric acid, the "coal 
balls " only containing a trace of it. If, as Mr. Binney thinks (see 
quotation in Proceedings for 1878), the coal balls have been formed 
from the shells in the roof of the coal, the substance that they are 
composed of would have come from some distance higher, the 
carbonate of lime being soluble in carbonic acid water, and the 
phosphate of lime insoluble, the carbonate of lime would be dissolved 
