96 
Fig. 8.—Same conditions as in Fig. 4. Fig. 9—Heated to 800° C. for 1 hour, 
Lower surface, polished and etched. cooled in furnace. x 50 
x 50 
Fig. 10.—Heated to 800° C. for 1 hour, Fig. 11.—Melted at 550° C. and cast in 
cooled in the furnace. x 50 iron chilled mold. Vertical section. 
x 50 
