Wig. 24. Abandoned channel of Lost river mentioned in explanation of pre 
vious figure. 
Fig. 25. Phantom lake, near Toyah, Texas. A collapse sink where the sub- 
terranean stream is revealed. The roof, of Washita limestone, collapsed, filling the 
channel and forcing the stream to the surface—cave on the left—in a stream about 
six feet in diameter. It fills the depression formerly occupied by the roof with 
water and enters sinks in the immediate foreground to its channel below. 
