Possibly a great epidemic, of the sort known to have swept Mexico before the coming of the Spaniard, gravely cut down the numbers of the ancient valley settlers. Near every communal castle is to be found a cemetery, filled with burial urns, their tops usually less than a foot below the surface. These urns (ollas) are filled with calcined human bones. By them are to be found the broken pottery, of which the spirits were to accompany the late lamented on their journey to the happy hunting grounds. These dishes once contained food, intended for the spirit travelers' nourishment. When there was a child, ofttimes now is found the clay image of a dog, for a dog always knows the way home. The dog is believed to have been the only domestic animal of the time. In some cases, in the greater houses, walled into crypts that might have served as family lounging places, have been found the skeletons of those who were of esoteric standing, considered able, by the force of will, to separate spirit from body. In other cases the cleansing and disintegrating effects of fire secured the necessary separation of the spirit from the body. With these mortuary evidences also are found domestic implements, stone clubs, arrow points and, particularly valuable, prayer sticks and religious implements that clearly show the archaeologist a connection with the pueblo-dwelling peoples who still live, under similar communal conditions, to the northward. Northward Trend of the Ancient People That these ancient peoples went north there can be no doubt. North of the valley, nearly fifty miles, on the Verde, is a great stone ruin and beyond it are cavate dwellings of remarkable sort. In Tonto Creek Valley, a dozen miles north of the Roosevelt dam, is an immense ruin built of gypsum blocks. To the eastward, Casa Grande, most famed of all Arizona prehistoric remains, still stands, iron-roofed by a careful government, probably of a later time of abandonment, but still a ruin when first seen by Father Eusebio Kino in 1694. All the way up the Gila, and with a notable southern stem through the Mimbres Valley, are found these same evidences of ancient occupation. Chichilticalli, "the Red House," mentioned by Marco de Niza and by Coronado's historians in 1539-40, lay somewhere near where another group of Mormons again reclaimed the desert soil by irrigation in the upper Gila Valley. Ruins extended from Pueblo Viejo ("Old Town"), above Solomonville, down to San Carlos. Into the valleys of the Salt and of the Gila, from the north come many waterways. In none of these tributary valleys can there be failure to find evidences of the northward march of the Indians who lived in houses. In this intermediate region, the houses usually, for protection, were placed in the cliffs. Particularly notable are the cave dwellings of the upper Verde and in Tonto Basin, near Roosevelt, and in the Sierra Anchas and near Flagstaff. [Illustration: THE ARIZONA TEMPLE AT MESA]