95 
Fig. 4.—Metal melted at 550° and pour- Fig. 5—Same conditions as in Fig. 4. 
ed on a warm iron plate. Upper Upper surface. x 50 
surface. X 50 
Fig. 6.—Same conditions as in Fig. 4. Fig. 7. 
Same conditions as in Fig. 4. 
Upper surface. x 50 Upper surface. x 50 
