106 THE MAMMOTH CAVE. 
The walls and ceiling are incrusted with crystals 
of gypsum and carbonate of lime, of great bril- 
liancy and indescribable beauty. The floor is 
covered with white crystals of limestone, and ‘is 
unobstructed by fallen rock. In point of beauty 
there is no avenue superior to this. 
Lucy’s Dome is reached by passing through 
Rhoda’s Arcade. It is about sixty feet in its 
greatest diameter, and over three hundred in 
height, being the highest dome in the Cave. 
The sides appear to be composed of immense 
curtains, extending from the ceiling to the 
floor. 
We next reach THE Pass or EL Guor, which 
resembles Silliman’s Avenue, but the cliffs com- 
posing its walls present a more wild and rugged 
appearance. It is about two miles in length. 
Of this Pass, Bayard Taylor remarks that he 
supposes it was named by some traveler who 
had been in Arabia Petraea, and adds that the 
name is a pleonasm, as el ghor signifies a 
narrow, difficult pass between rocks. 
Mr. Taylor regarded the Pass of El Ghor as 
by far the most picturesque avenue in the Cave. 
He continues: “It is a narrow, lofty passage 
meandering through the heart of a mass of hor- 
izontal strata of limestone, the broken edges of 
