The two great rivers are the Gila and Colorado, with their principal tributaries, the San Juan, Little Colorado, Bill Williams, Rio Verde, and Salt rivers. The Colorado has the most remarkable cañon formation in the known world. The valleys of the San Juan, Little Colorado, Salt, and Gila rivers are agricultural valleys, with millions of acres of great fertility, producing wheat, barley, oats, cotton, tobacco, lemons, oranges, grapes, figs, etc., of which over two hundred thousand acres are now under cultivation. Portions of the valleys of Santa Crux and Gila are cultivated by the Indians. Upon the Little Colorado are many settlements of Mormons. In the western and southwestern sections are large areas of desert land, intensely warm in summer. The northern and eastern sections are at a higher altitude, and possess a delightful climate. The climate is remarkably healthy, and with the coming of railways will be greatly sought by invalids. The Southern Pacific Railroad crosses the southern section of the Territory from west to east, and the Atlantic and Pacific the northern portion from east to west, while a branch line of the Atchison, Topeka and Santa Fe connects the southern portion with the Gulf of California at Guymas. The great industry of the country is silver mining, building up flourishing districts at Tombstone, Globe, Prescott, and other places. Gold, copper, and lead also abound. THE SIX FOLLIES OF SCIENCE. By I. D’ISRAELI. Nothing is so capable of disordering the intellects as an intense application to any one of these six things: the Quadrature of the Circle; the Multiplication of the Cube; the Perpetual Motion; the Philosophical Stone; Magic; and Judicial Astrology. In youth we may exercise our imagination on these curious topics, merely to convince us of their impossibility; but it shows a great defect in judgment to be occupied on them in an advanced age. “It is proper, however,” Fontenelle remarks, “to apply one’s self to these inquiries; because we find, as we proceed, many valuable discoveries of which we were before ignorant.” The same thought Cowley has applied, in an address to his mistress, thus: “Although I think thou never wilt be found, Yet I’m resolved to search for thee: The search itself rewards the pains. So though the chymist his great secret miss, (For neither it in art or nature is) Yet things well worth his toil he gains; And does his charge and labor pay With good unsought experiments by the way.” The same thought is in Donne. Perhaps Cowley did not suspect that he was an imitator. Fontenelle could not have read either; he struck out the thought by his own reflection. It is very just. Glauber searched long and deeply for the philosopher’s stone, which though he did not find, yet in his researches he discovered a very useful purging salt, which bears his name.