The agricultural resources of Arizona, are sufficient to sustain a large mining population, and afford abundant supplies for the great immigration which will follow the development of its mineral resources. The whole valley of the Gila, more than four hundred miles in length, can be made with proper exertion to yield plentiful crops. The Pimos Indians, who live in villages on the Gila, one hundred and seventy miles from its mouth, raise large crops of cotton, wheat, and corn, and have for years supplied the thousands of emigrants who traverse the Territory en route to California. These Indians manufacture their cotton into blankets of fine texture and beautiful pattern, which command a high price. They also grind their corn and wheat, and make bread. In fact, the Pimos realize in their everyday life something of our ideas of Aztec civilization. A town will probably grow up just above the Pimos villages, as there is a rich back country, and the streams afford a valuable water power for running mills. The valley of the Santa Cruz traverses the territory from South to North, sinking near the town of Tueson, and probably finding its way to the Gila, as a subterranean stream. This valley, of the richest land, is about one hundred miles long, in many places of great width, and has on each side of it many rich valleys of limited extent, watered by streams from the mountains, which flow into the Santa Cruz. The valleys and Ranches of Arivaca, Sopori, Calabazas, and Tueson, are those at present most thickly settled. These produce all the fruits known to a Southern clime--grapes, wheat, corn, and cotton in great abundance. The San Pedro river and valley is also one of great richness, and is reported by Lieut. Parke as capable of sustaining a large population. The Valle de Sauz, still farther East, more limited than the San Pedro or Santa Cruz, can be made available for a considerable population. The Mimbres River also can, by a small outlay, be made to irrigate a large surface and supply a moderate settlement. The various springs laid down by Gray, Emory, Parke, and Bartlett, will all afford water for small settlements, and their supply can be much increased by a judicious outlay of money. The Rio Grande valley is very rich, and in places of great width. The Mesilla valley already contains a population of about five thousand souls, and there is ample room for many more.