British Association, SOth Report, Sheffield, 1910.] [Plate X. 



No. 5. 

 Same as No. 4. Section cut parallel to the surface of a massive carbide plate. 



The ground mass is carbide of iron. 

 The white dots are sulphide of iron. 



No. G. 

 Glazed Cleveland Iron after melting with a little Sulphide of Iron. 



White crystals = primary carbo-silicide of iron. 

 Dark = the second cementite. 

 Complex structure =iron-carbon-phosphorus eutectic. 



