A round tower built of sandstone blocks stood on a jutting point of rock far above the fertile valley. Adjoining it was a low, oblong room fitted with two small openings. This was both guard and shelter. From the tower a watcher kept constant lookout, for the men were far from home and unprotected by natural walls, as they were in the cliff village, and a sudden rush of enemies from any of the many intersecting canyons might result in a terrible loss of life. The watcher was not Bimba, however, who could not be spared from the watch tower above the village, where long usage had made him familiar with every crack and crevice of the hills and valleys within the sweep of his sharp eyes, until not even a rabbit could cross an open spot undiscovered. Now that the men were gone it was more important than ever to have a trusted and experienced watcher to guard the women and children. So the guardian in the tower above the great field was not Bimba, but Haida, who, next after the veteran himself, had the sharpest eyes in the clan. No alarm came, however, to mar the joy of the planting time. Day after day the men worked on, cleaning away every weed and bush as they went, and seeing that every one of the treasured seeds had its proper chance to grow and thrive. For upon the crop must depend the lives of all the next winter. Though they went on occasional long hunts, the Cliff men were not, like their neighbors and enemies, the Utes and Apaches, dependent upon game for the greater part of their living. Corn was the main food of the people of the cliffs, and whether parched to be eaten whole, or ground in three-parted stone metates to be made into the great thin sheets of piki, or paper bread, it formed the staff of life for them. Hence the great importance of every seed-grain, for the winters in the canyons were long and there were many mouths to feed. There were long days of work, and weary nights when the men lay down in the stone shelter adjoining the watch tower with aching muscles but hopeful hearts; but at last every seed was in. The irrigating channels were straight and clean, and the reservoir, as they had ascertained, was two-thirds full of water. Even so soon the favor of the gods seemed sure, for twice since the planting had begun good rains had fallen, leaving the earth dark and mellow and rich with promise.