sible, however, that some of my
hurried observations at this point may be worthy of record.

Montezuma Well (plate XCIV) is an irregular, circular depression,
closely resembling a volcanic crater, but evidently, as Dr Hoffman
well points out, due to erosion rather than to volcanic agencies. As
one approaches it from a neighboring ranch the road ascends a low
elevation, and when on top the visitor finds that the crater occupies
the whole interior of the hill. The exact dimensions I did not
accurately determine, but the longest diameter of the excavation is
estimated at about 400 feet; its depth possibly 70 feet. On the
eastern side this depression is separated from Beaver creek by a
precipitous wall which can not be scaled from that side. At the time
of my visit there was considerable water in the "well," which was
reported to be very deep, but did not cover the whole bottom. It is
possible to descend to the water at one point on the eastern side,
where a trail leads to the water's edge.

There appears to be a subterranean waterway under the eastern rim of
the well, and the water from the spring rushes through this passage
into Beaver creek. At the time of my visit this outflow was very
considerable, and in the rainy season it must be much greater. The
well is never dry, and is supplied by perennial subterranean springs
rather than by surface drainage.

The geological agency which has been potent in giving the remarkable
crater-like form to Montezuma Well was correctly recognized by Dr
Hoffman[22] and others as the solvent or erosive power of the spring.
There is no evidence of volcanic formation in the neighborhood, and
the surrounding rocks are limestones and sandstones. Not far from
Navaho springs there is a similar circular depression, called Jacob's
Well, but which was dry when visited by me. This may later be found to
have been formed in a similar way. At several places in Arizona there
are formations of like geological character.

[Illustration: BUREAU OF AMERICAN ETHNOLOGY

SEVENTEENTH ANNUAL REPORT PL. XCIV

MONTEZUMA WELL]

The walls of Montezuma Well are so nearly perpendicular that descent
to the edge of the water is difficult save by a single trail which
follows the detritus to a cave on one side. In this cave, the roof of
which is not much higher than the water level, there are fragments
of masonry, as if structures of some kind had formerly been erected in
it. I have regarded this cave rather as a