33. Who while boldly penetrating into the remoter districts of upper India, came to a certain woody retreat, of which with its tranquil silence the Brahmans, men of sublime genius, were the possessors. From their teaching he learnt the principles of the motion of the world and of the stars, and the pure rites of sacrifice, as far as he could; and of what he learnt he infused some portion into the minds of the Magi, which they have handed down by tradition to later ages, each instructing his own children, and adding to it their own system of divination. 34. From his time, through many ages to the present era, a number of priests of one and the same race has arisen, dedicated to the worship of the gods. And they say, if it can be believed, that they even keep alive in everlasting fires a flame which descended from heaven among them; a small portion of which, as a favourable omen, used to be borne before the kings of Asia. 35. Of this class the number among the ancients was small, and the Persian sovereigns employed their ministry in the solemn performance of divine sacrifices, and it was profanation to approach the altars, or to touch a victim before a Magus with solemn prayers had poured over it a preliminary libation. But becoming gradually more numerous they arrived at the dignity and reputation of a substantial race; inhabiting towns protected by no fortifications, allowed to live by their own laws, and honoured from the regard borne to their religion. 36. It was of this race of Magi that the ancient volumes relate that after the death of Cambyses, seven men seized on the kingdom of Persia, who were put down by Darius, after he obtained the kingdom through the neighing of his horse. 37. In this district a medical oil is prepared with which if an arrow be smeared, and it be shot gently from a loose bow (for it loses its effect in a rapid flight), wherever it sticks it burns steadily, and if any one attempts to quench it with water it only burns more fiercely, nor can it be put out by any means except by throwing dust on it. 38. It is made in this manner. Those skilful in such arts mix common oil with a certain herb, keep it a long time and when the mixture is completed they thicken it with a material derived from some natural source, like a thicker oil. The material being a liquor produced in Persia, and called, as I have already said, naphtha in their native language. 39. In this district there are many cities, the most celebrated of which are Zombis, Patigran, and Gazaca; but the richest and most strongly fortified are Heraclia, Arsacia, Europos, Cyropolis, and Ecbatana, all of which are situated in the Syromedian region at the foot of Mount Jasonius.