42 THE MAMMOTH CAVE. 
mile from its present location, constituting what 
is now called Dickson’s Cave. 
This Cave terminates within a few feet of the 
mouth of Mammoth Cave, but there is at present 
no direct communication between the two. 
The voice of a person at the end of Dickson’s 
Cave can be distinctly heard at the entrance of 
Mammoth Cave. 
The present entrance to Mammoth Cave was 
formed, and its communication with» Dickson’s 
Cave cut off, by the disintegrating action of the 
water of the spring, which discharges its con- 
tents at the mouth of the former, and caused the 
Cave to fail in at this point,—thus establishing 
a new entrance, and shortening the length of 
the Cave about half a mile. This is also the 
theory put forth by Dr. Wright, and there seems 
to be no reason for questioning its correctness. 
Dickson’s Cave differs but little in size and 
‘appearance from Proctor’s Arcade in the Mam- 
moth Cave. 
