28 THE MAMMOTH CAVE. 
plored, river, and found that the main avenue terminated in a 
dome more extensive than any that they hadeverseen. What was 
beyond this dome they could not conjecture, as they were unable 
to enter it from the avenue. They estimate that they traveled 
eight miles in this one avenue. I have not seen it myself. ‘The 
explored portions of ‘the Cave that I have visited constitute 
within themselves an under-ground world; and Iam satisfied that I 
have traveled from 150 to 200 miles in the different avenues, upon 
the Long Route especially. There is a perfect wilderness of Cave 
that is never seen or dreamed of by visitors generally, and many 
parts more beautiful than those ordinarily seen by parties making 
the Long Route. I refer particularly to Marion’s Avenue, Ali- 
da’s Avenue, Murdock’s Pass, and out Boone’s Avenue and the 
regions of Mystic River.” 
