70 PUEBLO ARCHITECTURE. 
the evidence of additions and changes, but such evidence is not wholiy 
wanting in the older portions. The large row that bounds the original 
eastern court on the west side may be seen on the plan to be of unusual 
width, having the largest number of rooms that form a terrace with 
western aspect; yet the nearly straight line once defining the original 
back wall of the court inclosing cluster on this side has not been ob- 
scured to any great extent by the later additions (Pl. xxvii). This 
village furnishes the most striking example in the whole group of the 
manner in which a pueblo was gradually enlarged as increasing popula- 
tion demanded more space. Such additions were often carried out on 
a definite plan, although the results in Tusayan fall far short of the sym- 
metry that characterizes many ruined pueblos in New Mexice and Ari- 
ZONA, 
A few of these ancient examples, especially some of the smaller ruins 
of the Chaco group, are so symmetrical in their arrangement that they 
seem to be the result of a single effort to carry out a clearly fixed plan. 
By far the largest number of pueblos, however, built among the south- 
west tablelands, if occupied for any length of time, must have been 
subject to irregular enlargement. In some ancient examples, such addi- 
tions to the first plan undoubtedly took place without marring the gen- 
eral symmetry. This was the case at Pueblo Bonito, on the Chaco, 
where the symmetrical and even curve of the exterior defensive wall, 
which was at least four stories high, remained unbroken, while the large 
inclosed court was encroached upon by wings added to the inner ter- 
races. These additions comfortably provided tor a very large increase 
of population after the first building of the pueblo, without changing its 
exterior appearance. 
In order to make clearer this order of growth in Mashongnavi, a series 
of skeleton diagrams is added in Figs. 10,11, and 12, giving the outlines 
of the pueblo at various supposed periods in the course of its enlarge- 
ment. The larger plan of the village (Pl. xxvi) serves as a key to 
these terrace outlines. 
The first diagram illustrates the supposed original cluster of the east 
court (Fig. 10), the lines of which can be traced on the larger plan, and 
it includes the long, nearly straight line that marks the western edge 
of the third story. This diagram shows also, in dotted lines, the gen- 
eral plan that may have guided the first additions to the west. The 
second diagram (Fig. 11) renders all the above material in full tint, again 
indicating further additions by dotted lines, and so on. (Fig. 12.) The 
portions of a terrace, which face westward in the newer courts of the 
pueblo, illustrated in Pl. xxrx, were probably built after the western 
row, completing the inclosure, and were far enough advanced to indi- 
cate definitely an inclosed court, upon which the dwelling rooms faced. 
