128 THE MAMMOTH CAVE. 
Serena’s Arbor is twenty feet in diameter and 
about forty in height. The walls and ceiling 
are covered with stalactite cornices, columns, 
grooves, ogees, etc., many of which are semi- 
transparent and sonorous. 
At the base of the Rocky Mountain the guide 
stopped, intimating that the terminus of the 
journey had been reached. Having read a 
thrilling account of a descent into the Mael- 
strom some years ago, we expressed a desire to 
see the awful pit, which was some distance 
beyond. All the gentlemen of the party, and 
one or two of the ladies also, expressed a will- 
ingness to climb the Rocky Mountain. The 
other ladies awaited our return. The ascent of 
the mountain was extremely difficult, and it is 
not to be wondered at that the guides do not 
insist upon visitors passing over it. 
Beyond the mountain we enter Crogan’s Hall, 
which constitutes the end of the Long Route, 
and which is about seventy feet wide and twenty 
high. The left wall is covered with stalactite 
formations, which are white and semi-transpa- 
rent and of great hardness, and fragments of 
which are sometimes worked into ornaments. 
