Phil. Mag. Ser. 6, Vol. 8, Pl. VI. 
Fic. 5._The same, lightly etched with chlorine water, disclosing granular texture 
immediately below the smoothly polished surface. 
Fie. 6.—The same, close to one of its edges, further etched with chlorine water disclosing 
deformed grains and lamellae immediately below the granular layer seen in Fig. 5, 
The breaking down of the lamelle into granules is well seen. 
