50 
INDEX. 
U. 
Page. 
Upper Cross Timbers ------- 27 
W. 
Water among the Sand hills. 20 
in natural tanks.-.-.-.-.-. 15,22 
salt. 20 
springs. 21 
at the base of Guadalupe mountains_______ 22 
in the strata of the Llano.. 23 
mineral. 21,38 
Wheatley mines, cerusite at........-.-. 38 
Whipple, Lieutenant A. W. ______-... 9 
Windsor, Nova Scotia, gypsum of.. 26 
Witchita mountains _ 8 
