Report of National Museum, 1 893.— Merrill. 



Plate 9. 



FiR. 1. Microscopic structure of onyx marble showing fibrous strKctiue extending upward across 

 tlie plane of deposition. - ' cviuctnuss 



Fig. a. Vase of " Egyptian Alabaster'Mstalagniitic marble), fr..m Sakkarati. From the Abbott 

 collection of Egyptian antiquities in the possession of the New Yoi-k Historical Society 



