Report of U. S. National Museum, 1899.- Merrill. 



- A 



Plate 15. 



"A 



Fig. 1. 







Fi,-. -J. 

 MiCROSECTIONS SHOWING THE APPEARANCE OF (l) KaOLINITE AND C2^ WASHED 



Kaolin. 

 The enlargement is the same in both cases. 



