ANNALS CARNEGIE MUSEUM, Vol. XI 



Plate XLVIII. 



Fig. I. Saltville Valley. The pools in the middle distance represent old sink-holes. The 

 recent cave-in is designated by the white cross at the right. 



Fig. 2. Near view of cave-in at " Well No. 69," Mathieson Alkali Works, Saltville, \'irginia. 



