MR. E. W. BINNEY ON THE ORIGIN OF IRONSTONES. 4 1 



Carbonic acid 30.76 



Protoxide of iron 38.80 



„ manganese 0.07 



Lime r. 5.30 



Magnesia 6.70 



Silica 10.87 



Alumina 6.20 



Peroxide of iron 0.33 



Coaly matter 1.87 



Sulphur 0.16 



Moisture 0.00 



101.00 



In the same valuable paper is •an analysis of the North 

 Staffordshire blackband ore, from the upper part of the 

 Pottery coal field, made by Mr. Herapath, of Bristol. It is 

 as follows : * 



Protoxide of iron 42.25 



Bilsulphate of iron 3.53 



Protoxide of manganese 7.48 



Silica 2.20 



Alumina .*. 0.50 



Lime 4.09 



Magnesia 2.60 



Bituminous matter, carbonic acid, and loss 37.35 



100.00 



In both the above specimens, traces of phosphoric acid, 

 arising from the remains of shells, and fish bones and scales, 

 would no doubt be found. 



The argillaceous, as well as the blackband ores, would be 

 formed under very similar conditions, except that the latter 

 were, doubtless, produced amidst a much greater amount of 

 decomposing vegetable and animal matters, as the great 

 excess of bituminous matter appears to shew. 



In a communication read before this Society,! the state of 



• Page 153 of Mr. Black well's Paper. 

 t On the Origin of Coal, by E. W. Binney, Vol. VIII. (New Seriet) 

 p. 148 of the Society's Memoirs. 



G 



