108 THE MAMMOTH CAVE. 



ten feet from the floor. It closely resembles the 

 object after which it is named. 



5. Boone's Avenue leads off to the left. It 

 has been explored only about one mile, and 

 nothing further is known as to its extent or 

 dimensions. 



6. Coeinna's Dome rests directly over the 

 center of the avenue. It is forty feet high and 

 nine wide. It was formed by the solvent action 

 of water, which entered it through a fissure at 

 the top, when the Pass of El Ghor was filled 

 with water. Had it been formed after the 

 water had left the avenue, there would have 

 been a pit beneath it, as at Shelby's ^ Dome 

 and the Bottomless Pit. 



7. The Black Hole of Calcutta is situated 

 on the left side of the avenue, and is about 

 fifteen feet deep. 



8. Stella's Dome is two hundred and fifty 

 feet in height, and, in general appearance, re- 

 sembles Lucy's Dome. It is reached by passing 

 through a small avenue which enters the left 

 wall of the Pass of El Ghor. 



9. The Chlmes consist of depending rocks, as 

 in the Bacon Chamber, which, when struck, 

 emit a musical sound. These are objects of 

 interest to the visitor. 



