Persons seized with this madness take scarcely any food or sleep, and walk up and down pale with fasting and melancholy: you would imagine that they were contemplating some new system of the figure of the earth, or studying how to square the circle. By day, however, they betray no signs of alienation of mind, nor are they to be feared before evening. A person of this description, who was very turbulent at night, visited me in the middle of the day. In familiar conversation I asked him who it was that disturbed the rest by his furiousness every night. He replied with a calm countenance, that he did not know. The Spaniard, my companion, seeing him take his leave, said, "This is the man you have long wished to know. This is he that raves at night." Yet I could discover nothing indicative of derangement either in his countenance or manners. Another insane person of the kind, whom I knew, met me as we were both riding in the plain, and joined company with me. But, pretending business, I put spur to my horse and hastened home. Twice when I was shutting the door of my hut, and once when I was tying a horse to a stake to feed, I should have been destroyed by a madman, had not persons come to my succour and averted the danger. Sometimes many persons of both sexes began to rave at once; sometimes one, and often no one was in this deplorable state. This madness lasted eight, fourteen, or more days, before tranquillity and intellect were restored. All the Abipones subject to this malady, whom I have known, were uniformly of a melancholy turn of mind, always in a state of perturbation from their hypochondriac or choleric temper, and of a fierce, threatening countenance. When this bile was excited by bad air, or immoderate drinking, it is neither strange nor surprising, that derangement and raving madness ensued. The stupid or ignorant alone attribute that to magic art, which is solely to be ascribed to the fault or strength of nature. We have found the fear of death a powerful antidote to the licence of raving amongst the Abipones. Within a few days the number of mad persons increased unusually: one of them in the dead of the night got through the fence, and was stealing into our house, but was carried away by people who came to our assistance. Alaykin, the chief Cacique, being informed of our danger, called all the people into the market-place next day, and declared, that if any one henceforward took to raving, he should immediately put to death all the female jugglers, as well as the insane themselves. From that time I never heard of any more tumults occasioned by these furious persons. Might not some of them have feigned madness in the first instance, because they loved to be objects of terror to their hordesmen, and to be pointed at with the finger? I never can believe with the savages, that a magical charm was the cause of their insanity. CHAPTER XXIII. OF MEASLES, SMALL-POX, AND THE MURRAIN IN CATTLE.