ent country over a territory
of varying extent, sometimes many square miles. At some point the roof
fell in more rapidly than in other parts, until at last it became so
thin as to give way entirely. If the debris was not sufficient in
amount to extend above that part of the roof which remained intact on
either side, so that it would be gradually carried away, the cave
would remain open in both directions, as is the case at the "Gulfs"
just described and at other caves statements of which appear in
subsequent pages. Usually the debris quite chokes up one side and all
the superficial drainage is turned into the other, which is thus kept
open. In time, the slope around the depression becomes tolerably
uniform except close to the entrance, and there is no outward
indication that the cave ever extended farther than the spot where the
new entrance is located. So the cave, as it is now open to
examination, is only a portion of the original passage, and as the
explorer pursues his way, he may be going toward either the former
mouth or the source. In the former case, he comes out of a large
opening, or what was formerly such, on some slope in the neighborhood,
or descends until his way is obstructed by water. In the latter, he
may find his way shut off by diminishing passages, or he may descend
to lower levels through newer drainage channels cut by the streams
which have been reversed and forced to carve other outlets for
themselves.

This change occurred in the Milltown Cave a very long time ago.
Standing on the debris, several feet within the entrance and beneath a
part of the roof now perfectly dry and showing no marks of percolating
water, is a stalagmite 31 inches in diameter, which has weathered to a
depth of 3 to 4 inches from atmospheric influences alone.

WYANDOTTE CAVE.--So much has been printed concerning this celebrated
cavern that no mention need be made of its interior features. The
place seems excellently adapted as a habitation for primitive people.
It is situated on a hill at whose foot is the bank of Blue River. Five
miles away, as the road runs, is the Ohio. The backwater sometimes
reaches up the tributary for more than 10 miles. The flint-bearing
stratum of the Harrison County aboriginal quarries outcrops a short
distance away and appears at several points within the cave. The
country is extremely rugged, and good springs occur frequently. Game
was formerly abundant in the hills, and Blue River still reward