U. S. NATIONAL MUSEUM 



BULLETIN 149, PLATE 11 







(1). SWOLLEN KAMACITE IN MESA VERDE IRON; (2). STRUCTURE OF FOUR 



Corners Iron, Enlarged; (3). Quartz Crystals in St. Marks Stone: 



(LOWEST). CHONDRULES IN SHARPS. VA., STONE 



For explanation of plate see page 14 



