160 CASA GRANDE, ARIZONA [ETH. ANN. 28 
’ 
pletely broken, and at every Snake festival one of the Tcamahia 
from Acoma is a guest. This is the asperger, who chants the words 
Tcamahia, Awahaia, ete. 
In considering the prehistoric migrations of agricultural peoples 
in the Southwest, especially with respect to changes in culture and 
to diminution of population, we must not lose sight of the influence 
of increased salinity due, directly or indirectly, to long-continued 
prehistoric irrigation. This cause was perhaps more effectual than 
human enemies or increased aridity in breaking up the prehistoric 
culture. If barrenness of the soil, due to the cause mentioned, led 
to the abandonment of populous aboriginal compounds, this fact 
has an important bearing on the future of the white farmers in the 
Gila and Salt River Valleys. 
a 
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