1881. 63 Trans, N. Y. Ac. Sez. 
‘Charybdis, where the sound of its trickling is still audible. Shelby’s 
Dome is simply the upward continuation of this combined pit. So nar- 
row, moreover, are the ridges separating Scylla from Charybdis on the 
one side and from the Covered Pit, (g), on the other, and so small is the 
distance to the Side Saddle Pit (4), that it seems in the highest degree 
probable that this group of pits compose merely the upper branches 
of a single large pit into which they are all united, or at least directly 
connected before the bottom is reached, and the small relative depth of 
the Side Saddle Pit is explicable in the same manner as that of the Bot- 
tomless Pit. Such an extraordinary group of pits, forming an appar- 
ent nucleus of cave drainage, might be expected to have its counterpart in 
an unusually large depression, or group of sink-holes, at the surface. 
Impressed with this idea, Mr. Hovey found in the woods, scarcely half 
a mile from the Hotel, in the known direction of these pits, a depression 
(p Fig. 2.), many acres in extent, and so deep that from its edge he 
could overlook the tops of the pine trees that rose from the middle. 
Leaving this region of pits and domes, the route leads still downward, 
passing again under the main cave through the narrow tortuous chan- 
nel known as ‘“‘ Fat Man’s Misery” (s) where the distance from floor to 
roof is in many places not more than three feet. Through.the floor a 
winding passage has been worn away, varying in width and depth from 
one to three feet. This terminates in a chamber which has received 
the appropriate name of ‘Great Relief,’’ where the succession of 
pebbles, gravel, sand and fine clay again records the work of erosion 
and deposit. This bed is not more than 50 or 60 feet above the 
drainage level, and from here down to the River Styx, the ground 
becomes more or less damp. A _ succession of bodies of water 
are then encountered, including the tubular Echo River, which is 
nav:gated in boats. It is a part of the tunnel which has subsided 
below the water level, and is in connection with Green River, being 
filled to within a few feet of the roof in summer, and completely 
closed in winter when the Green River rises. The column of air be- 
tween the water and the impervious roof, closed everywhere except at 
the two ends, which are three-fourths of a mile apart, serves as a 
resonator for any note within the range of the human voice, and mul- 
tiple echoes gliding imperceptibly into each other, continue to be re- 
turned for many seconds after the voice has been hushed. 
Beyond Echo River, the cave may be followed with continual ascent, 
through Silliman’s Avenue, the Pass of El Ghor and Cleveland’s Cab- 
inet, for about five and a half miles. A pile of jagged rocks, 100 feet 
high, is then surmounted and the wearied climber is confronted with a 
large cavern, Joo feet wide and 70 feet deep, where three short 
branches have united in one tunnel. Following the left branch for a 
