Thus it is with this region. But west of the Tritonian lake the Libyans are not nomads; they do not follow the same customs, or treat their children as the nomads do. For the practice of many Libyan nomads (I cannot say absolutely whether it is the practice of all) is to take their children when four years old, and to burn the veins of their scalps or sometimes of their temples with grease of sheep's wool, so that the children may never afterward be afflicted by phlegm draining from the head. They say that this makes their children quite healthy. In fact, the Libyans are the healthiest of all men whom we know; whether it is because of this practice, I cannot say absolutely; but they certainly are healthy. When the children smart from the pain of the burning, the Libyans have found a remedy; they soothe them by applications of goats' urine. This is what the Libyans themselves say.