rizontal roof-beams, must be 10 feet long, but without forks;
and two more, the straightest and longest, are necessary for the doorway
passage. These ten timbers are called _tsaci_, the same term that is
applied to the five main timbers of the ordinary hogan.

The four posts are set firmly in the ground in shallow holes at
distances apart corresponding to the length of the main roof-beams,
and so arranged as to describe a square, the sides of which face the
cardinal points. The prescribed position of the doorway is the center
of the eastern side, and it must face the east exactly. The post at
the southeastern corner is the first to be set, then the one at the
southwestern corner, with the forks arranged on the same line. The
northwestern post is then set, and finally the one at the northeastern
corner, and the forks of the last two are also placed on the same line.
In the ground plan (figure 241) the posts are numbered in the order in
which they are set up. This sequence is not always strictly followed,
but the old men say that this is the proper way.

The beam for the southern side of the roof is next lifted into place and
laid so as to rest in the forks of the two posts on that side, with the
ends projecting a little beyond them. The beam on the northern side is
similarly placed, and the western and the eastern beams are next laid
so that their ends rest upon the ends of the beams already in place.
Another timber is then placed parallel with the eastern beam, as shown
on the plan. This forms the western side of the smoke-hole and also
a support for the smaller roof-timbers to rest upon. Sometimes an
additional timber is laid across for this purpose between the one last
named and the next beam. The two timbers for the sides of the doorway
passage are then placed in position about 3 feet apart and leaning
against the eastern roof-beam. The butt ends rest upon the ground, and
the space between them should be in the center of the eastern side.
All the main posts and beams are stripped of bark, the rough knobs and
protuberances are hewn off, and they are finished according to the skill
of the builders or the exactions of the old men who superintend the
construction.

While this work is in progress a great number of smaller and less
shapely timbers are procured for the sides and roof. To determine a
pitch for the sloping sides all the workers arrange themselves so as to
encompass the square frame, and a few of the longest