Mr. Ellicott, of the Patuxent Furnaces, asserts that, "out of about 100 mules at the works, we have not lost on an average one in two years. Bleeding at the mouth will cure them of nearly every disease, and by being turned out on pasture, they will recover from almost every accident. I do not recollect we have ever had a wind-broken one. They are scarcely ever defective in the hoof, and though kept shod, it is not as important as with the horse. Their skin is tougher than that of the horse, consequently they are not as much worried by flies, nor do they suffer so much with the heat of summer." To the foregoing testimony may be added that of the late Judge Hinckley of Massachusetts; a shrewd and close observer through a long life of 84 years. He bred mules at an early day, and always kept a team of them for his farm work, much preferring them to horses for this purpose, after an experience of 50 years. He had a pair nearly 30 years old, which, with light pasturage in summer, and with a moderate supply of hay with little grain in winter, and no grooming, performed all the drudgery, though he kept his stable full of horses besides. They outlived successive generations of horses, and though the latter were often sick and out of condition, the mules never were. One from his stock, 45 years old, was sold for the same price paid for a lot of young mules, being at that mature age perfectly able to perform his full share of labor. For the caravans that pass over the almost inaccessible ranges which form the continuation of the Rocky Mountains, and the extensive arid plains that lie between and west of them, on the route from Santa Fé to California, mules are the only beasts of burden used in these exhausting and perilous adventures. Their value may be estimated from the comparative prices of mules and horses; for while a good horse may be bought for $10 to $20, a good mule is worth $50 to $75. Dr. Lyman, who recently passed through those regions, informs us that their caravan left Santa Fé with about 150 mules, 15 or 20 horses, all beasts of burden, and two choice blood-horses, which were led and treated with peculiar care. On the route, all the working-horses died from exhaustion and suffering; the two bloods that had been so carefully attended, but just survived; yet of the whole number of mules but 8 or 10 gave out. A mule 36 years of age was as strong, enduring, and performed as hard labor, as any one in the caravan. When thirst compelled them to resort for successive days to the saline waters, which are the only ones furnished by those sterile plains, the horses were at once severely, and not unfrequently fatally affected; while the mules, though suffering greatly from the change, yet seldom were so much injured as to require any remission of their labor.