to carry his horses over the intervening distance.

Throughout the whole region great scarcity of water prevails; in the
large valleys during most of the year there is none, and it is only in
the mountain districts that there is a permanent supply; but there life
is almost impossible during the winter. This condition has had much
to do with the migratory habits of the people, or rather with their
frequent moving from place to place; for they are not a nomadic people
as the term is usually employed. This is one of the reasons why the
Navaho have no fixed habitations.

San Juan river forms a short section of the northeastern boundary of
the Navaho country, and this is practically the only perennial stream to
which they have access. It is of little use to them, however, as there
are no tributaries from the southern or reservation side, other than the
Chaco and Chelly “rivers,” which are really merely drainage channels and
are dry during most of the year. The eastern slope of the mountain range
gives rise to no streams, and the foot of the range on that side is as
dry and waterless as the valley itself. One may travel for 20 miles over
this valley and not find a drop of water. Except at Sulphur springs,
warm volcanic springs about 30 miles south of the San Juan, the ordinary
traveler will not find sufficient water between the foot of the
mountains and the river, a distance of over 50 miles. Such is the
character of Chaco valley. But the Indians know of a few holes and
pockets in this region which yield a scanty supply of water during
parts of the year, and somewhere in the vicinity of these pockets will
be found a hogán or two.

Chaco wash or river, like most of the large drainage channels of this
country, has a permanent underflow, and by digging wells in the dry,