686 EXPEDITION TO ARIZONA IN 1895 [ETH. ANN 17 
with designs representing birds, is replaced by the triple intersecting 
lines in the remaining area. The resemblance of this figure to those 
already considered is clearly evident after a little study. 
The decoration on the food basin presented in plate CXXXxIX, a, is 
interesting in the study of the evolution of bird designs into conven- 
tional forms. In this figure those parts which are identified as homo- 
logues of the wings extend wholly across the interior of the food bowl, 
and have the forms of triangles with smaller triangular spurs at their 
bases. The wings are extended at right angles to the axis of the body, 
and taper uniformly to the rim of the bowl. The smaller spurs near the 
union of the wings and body represent the posterior part of the latter, 
and between them are the tail-feathers, their number being indicated by 
three triangles. 
There is no representation of a head, although the terraced rain-cloud 
figure is drawn on the anterior of the body between the wings. 
The reduction of the triangular wings of the last figure to a simple 
band drawn diametrically across the inner surface of the bowl is accom- 
plished in the design shown in plate Cxxx1x, b. At intervals along 
this line there are arranged groups of blocks, three in each group, 
representing stars, as will later be shown. The semicircular head has 
lost all appendages and is reduced to a rain-cloud symbol. The pos- 
terior angles of the body are much prolonged, and the tail still bears 
the markings representing three tail-feathers. 
The association of a cross with the bird figure is both appropriate 
and common; its modified form in this decoration is not exceptional, 
but why it is appended to the wings is not wholly clear. We shall see 
its reappearance on other bowls decorated with more highly conven- 
tionalized bird figures. 
In the peculiar decoration used in the treatment of the food bowl 
shown in plate CXXXIX, c, we have almost a return to geometric 
figures in a conventional representation of a bird. In this case the 
semblance to wings is wholly lost in the line drawn diametrically across 
the interior of the bowl. On one side of it there are many crosses 
representing stars, and on the other the body and tail of a bird. The 
posterior triangular extensions of the former are continued to a bounding 
line of the bowl, and no attempt is made to represent feathers in the 
tail. The rectangular figure, with serrated lower edge and inclosed 
terraced figures, finds, however, a homologue in the heads and bodies 
of most of the representations of birds which have been described. 
This gradual reduction in semblance to a bird has gone still further 
in the figure represented in plate CXXxxIXx, d, where the posterior end 
of the body is represented by two spurs, and the tail by three feathers, 
the triangular rain-clouds still persisting in the rectangular body. 
In fact, it can hardly be seen how a more conventionalized figure of 
a bird were possible did we not find in e of the same plate this reduction 
still greater. Here the tail is represented by three parallel lines, the 
