the same level. Pl. II., Figs. 2 and 3
will illustrate this point. As far as I could detect, the line _e e_ can
be admitted as the one where one of the two lower stories disappears,
and but one remains on the east side lower than the rest.

[Illustration: PLATE II
PLAN OF SECTIONS OF BUILDING B.]

I have everywhere assumed _four_ stories. It is at least certain that
there were not less than four. When Coronado visited the pueblo in 1540,
he found "the houses with four stories."[104] Sr. Mariano Ruiz told
me that "they all were of three stories;" but then he mentioned, below,
the "casas de comodidad," thus indicating that the lowest story was used
for store-rooms. It is very apparent from the ruins that, as I have
indicated in the cross-sections, the western wall was unbroken, whereas
from the east the stories rose in four retreating terraces. The western
wall already mentioned was given additional strength, by means of the
buttresses, of which I have given a small outline. The winds blow very
fiercely over the _mesilla_, especially from the north-west; there is no
tree to be seen on or about it, not even a cedar-bush, higher than a
couple of feet at most. Against such blasts the solid wall was
necessary, while the many intersecting partitions inside gave additional
strength. It was a very solid structure as against winds,
notwithstanding the comparative thinness of the walls,--0.63 m.--2
ft.--being their greatest width, and 0.33 m.--13 in.--their average.

With reference to the cross-sections, it now becomes possible to
approximate the total number of chambers, apartments, or cells,
contained in the entire building; a point impossible even to estimate
from the ground-plan alone.

Leaving aside the northern appendix, about whose elevation I have not
even means of conjecture, it becomes evident that the section whose four
corners are marked respectively _a_, _c_, _d_, _d_, had the following
number of compartments, starting with the lowest story, and remembering
that, as above stated, one longitudinal row had six, and the other five,
rooms:--

Lowest story 5
Second story 5
Third story 3 x 6 + 5 23
Fourth story 3 x 6 18
---
Total 51 rooms.

_Brought forward_