British Association, SOth Report, Sheffield, 1910.] 



No. !. 

 Cleveland White Iron. 



[Plate VITT. 



White = massive plates of Fe,C. 

 Dark=pearlite, the decomposed austenite. 

 White and half-tone = ternary Fe— C— P eutectic/ 



No. 2. 



Cleveland Glazed Iron. 



Ground mass=silico-ferrite. 



White complex=iron — iron phosphide eutectic. 



Straight dark lines = graphite. 



Illustrating the Presidential Address to Section B. 



