CANYONS OF THE COLORADO.
harder lavas they cut out blocks of the tufa and with them built pueblos two or three stories high. The blocks are usually about twenty inches in length, eight inches in width, and six inches in thickness, though they vary somewhat in size. On the volcanic cones which dominate the country these people built shrines and worshiped their gods with offerings of meal and water and with prayer symbols made of the plumage of the birds of the air. When the Navajo invasion came, by which kindred tribes were displaced from the district farther west, these Tewan Indians left their pueblos on the plateau and their dwellings by the rivers below in the depths of the canyon and constructed cavate homes for themselves; that is, they excavated chambers in the cliffs where these cliffs were composed of soft, friable tufa. On the face of the cliff, hundreds of feet high and thousands of feet or even miles in length, they dug out chambers with stone tools, these chambers being little rooms eight or ten feet in diameter. Sometimes two or more such chambers connected. Then they constructed stairways in the soft rock, by which their cavate houses were reached; and in these rock shelters they lived during times
A TYPICAL CLIFF DWELLING.
A ROOM IN A PUEBLO.