window of the room occupied by the officers of our party.

The next morning we were at the mouth of the cave at an early hour,
provided with guides, candles and rockets. We explored to a distance of
about three miles from the entrance, and found a succession of chambers
of great dimensions and of great beauty when lit up with our rockets.
Stalactites and stalagmites of all sizes were discovered. Some of the
former were many feet in diameter and extended from ceiling to floor;
some of the latter were but a few feet high from the floor; but the
formation is going on constantly, and many centuries hence these
stalagmites will extend to the ceiling and become complete columns. The
stalagmites were all a little concave, and the cavities were filled with
water. The water percolates through the roof, a drop at a time--often
the drops several minutes apart--and more or less charged with mineral
matter. Evaporation goes on slowly, leaving the mineral behind. This
in time makes the immense columns, many of them thousands of tons in
weight, which serve to support the roofs over the vast chambers. I
recollect that at one point in the cave one of these columns is of such
huge proportions that there is only a narrow passage left on either side
of it. Some of our party became satisfied with their explorations
before we had reached the point to which the guides were accustomed to
take explorers, and started back without guides. Coming to the large
column spoken of, they followed it entirely around, and commenced
retracing their steps into the bowels of the mountain, without being
aware of the fact. When the rest of us had completed our explorations,
we started out with our guides, but had not gone far before we saw the
torches of an approaching party. We could not conceive who these could
be, for all of us had come in together, and there were none but
ourselves at the entrance when we started in. Very soon we found it was
our friends. It took them some time to conceive how they had got where
they were. They were sure they had kept straight on for the mouth of
the cave, and had gone about far enough to have reached it.

CHAPTER XIV.

RETURN OF THE ARMY--MARRIAGE--ORDERED TO THE PACIFIC COAST--CROSSING THE
ISTHMUS--ARRIVAL AT SAN FRANCISCO.

My experience in the Mexican war was of great advantage to me
afterwards. Besides the many practical lessons it taught, the war
brought nearly all the officers of the regular ar